Table of well-known TCP/UDP ports
Table shows list of well-known TCP and UDP ports with assigned applications. Both official standarized by IANA and unofficial, but popular ports are presented.

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Ports officially assigned by IANA

Port numberTransport protocolService nameDescription
0TCP/UDPreserved-
1TCP/UDPtcpmuxTCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been true to TCPMUX by IANA, but by design only TCP is specified.
2-3TCP/UDPcompressnet-
4TCP/UDPfree-
5TCP/UDPrjeRemote Job Entry was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5 and IANA has true both TCP and UDP 5 to it.
6TCP/UDPfree-
7TCP/UDPechoEcho Protocol
8TCP/UDPfree-
9TCP/UDPdiscardDiscard Protocol
10TCP/UDPfree-
11TCP/UDPsystatActive Users (systat service)
12TCP/UDPfree-
13TCP/UDPdaytimeDaytime Protocol
14-16TCP/UDPfree-
17TCP/UDPqotdQuote of the Day (QOTD)
18TCP/UDPmspMessage Send Protocol
19TCP/UDPchargenCharacter Generator Protocol (CHARGEN)
20TCP/UDPftp-dataFile Transfer Protocol (FTP) data transfer
21TCP/UDPftpFile Transfer Protocol (FTP) control (command)
22TCP/UDPsshSecure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding
23TCP/UDPtelnetTelnet protocol-unencrypted text communications
24TCP/UDPany-
25TCP/UDPsmtpSimple Mail Transfer Protocol (SMTP), used for email routing between mail servers
26TCP/UDPfree-
27TCP/UDPnsw-fe-
28TCP/UDPfree-
29TCP/UDPmsg-icp-
30TCP/UDPfree-
31TCP/UDPmsg-auth-
32TCP/UDPfree-
33TCP/UDPdsp-
34TCP/UDPfree-
35TCP/UDPany-
36TCP/UDPfree-
37TCP/UDPtimeTime Protocol
38TCP/UDPrap-
39TCP/UDPrlp-
40TCP/UDPfree-
41TCP/UDPgraphics-
42TCP/UDPnameserverHost Name Server Protocol
43TCP/UDPnicnameWHOIS protocol
44TCP/UDPmpm-flags-
45TCP/UDPmpm-
46TCP/UDPmpm-snd-
47TCP/UDPreserved-
48TCP/UDPauditd-
49TCP/UDPtacacsTACACS Login Host protocol.TACACS+, still in draft which is an improved but distinct version of TACACS, only uses TCP 49.
50TCP/UDPre-mail-ck-
51TCP/UDPno dataHistorically used for Interface Message Processor logical address management, entry has been removed by IANA on 2013-05-25
52TCP/UDPxns-timeXerox Network Systems (XNS) Time Protocol. Despite this port being true by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.
53TCP/UDPdomainDomain Name System (DNS)
54TCP/UDPxns-chXerox Network Systems (XNS) Clearinghouse (Name Server). Despite this port being true by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.
55TCP/UDPisi-gl-
56TCP/UDPxns-authXerox Network Systems (XNS) Authentication Protocol. Despite this port being true by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.
57TCP/UDPany-
58TCP/UDPxns-mailXerox Network Systems (XNS) Mail. Despite this port being true by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.
59TCP/UDPany-
60TCP/UDPfree-
61TCP/UDPreservedHistorically true to the NIFTP-Based Mail protocol, but was never documented in the related IEN. The port number entry was removed from IANA's registry on 2017-05-18.
62TCP/UDPacas-
63TCP/UDPwhois++-
64TCP/UDPcovia-
65TCP/UDPtacacs-ds-
66TCP/UDPsql*net-
67TCP/UDPbootpsBootstrap Protocol (BOOTP) server; also used by Dynamic Host Configuration Protocol (DHCP)
68TCP/UDPbootpcBootstrap Protocol (BOOTP) client; also used by Dynamic Host Configuration Protocol (DHCP)
69TCP/UDPtftpTrivial File Transfer Protocol (TFTP)
70TCP/UDPgopherGopher protocol
71TCP/UDPnetrjs-1NETRJS protocol
72TCP/UDPnetrjs-2NETRJS protocol
73TCP/UDPnetrjs-3NETRJS protocol
74TCP/UDPnetrjs-4NETRJS protocol
75TCP/UDPany-
76TCP/UDPdeos-
77TCP/UDPany-
78TCP/UDPvettcp-
79TCP/UDPfingerFinger protocol
80TCP/UDPwww-httpHypertext Transfer Protocol (HTTP)
81TCP/UDPno data-
82TCP/UDPxfer-
83TCP/UDPmit-ml-devMIT ML Device, networking file system
84TCP/UDPctf-
85TCP/UDPmit-ml-dev-
86TCP/UDPmfcobol-
87TCP/UDPany-
88TCP/UDPkerberosKerberos authentication system
89TCP/UDPsu-mit-tg-
90TCP/UDPdnsix-
91TCP/UDPmit-dov-
92TCP/UDPnpp-
93TCP/UDPdcp-
94TCP/UDPobjcall-
95TCP/UDPsupdupSUPDUP, terminal-independent remote login
96TCP/UDPdixie-
97TCP/UDPswift-rvf-
98TCP/UDPtacnews-
99TCP/UDPmetagram-
100TCP/UDPno data-
101TCP/UDPhostnameNIC host name
102TCP/UDPiso-tsapISO Transport Service Access Point (TSAP) Class 0 protocol;
103TCP/UDPgppitnp-
104TCP/UDPacr-nemaDigital Imaging and Communications in Medicine (DICOM; also port 11112)
105TCP/UDPcsnet-nsCCSO Nameserver
106TCP/UDP3com-tsmux-
107TCP/UDPrtelnetRemote User Telnet Service (RTelnet)
108TCP/UDPsnagasIBM Systems Network Architecture (SNA) gateway access server
109TCP/UDPpop2Post Office Protocol, version 2 (POP2)
110TCP/UDPpop3Post Office Protocol, version 3 (POP3)
111TCP/UDPsunrpcOpen Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC)
112TCP/UDPmcidas-
113TCPauthIdent, authentication service/identification protocol, used by IRC servers to identify users
113TCP/UDPauthAuthentication Service (auth), the predecessor to identification protocol. Used to determine a user's identity of a particular TCP connection.
114TCP/UDPno data-
115TCP/UDPsftpSimple File Transfer Protocol
116TCP/UDPansanotify-
117TCP/UDPuucp-pathUUCP Mapping Project (path service)
118TCP/UDPsqlservStructured Query Language (SQL) Services
119TCP/UDPnntpNetwork News Transfer Protocol (NNTP), retrieval of newsgroup messages
120TCP/UDPcfdptkt-
121TCP/UDPerpc-
122TCP/UDPsmakynet-
123TCP/UDPntpNetwork Time Protocol (NTP), used for time synchronization
124TCP/UDPansatrader-
125TCP/UDPlocus-map-
126TCP/UDPnxeditFormerly Unisys Unitary Login, renamed by Unisys to NXEdit. Used by Unisys Programmer's Workbench for Clearpath MCP, an IDE for Unisys MCP software development
127TCP/UDPlocus-con-
128TCP/UDPgss-xlicen-
129TCP/UDPpwdgen-
130TCP/UDPcisco-fna-
131TCP/UDPcisco-tna-
132TCP/UDPcisco-sys-
133TCP/UDPstatsrv-
134TCP/UDPingres-net-
135TCP/UDPepmapMicrosoft EPMAP (End Point Mapper), also kfalsewn as DCE/RPC Locator service, used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM
136TCP/UDPprofile-
137TCP/UDPnetbios-nsNetBIOS Name Service, used for name registration and resolution
138TCP/UDPnetbios-dgmNetBIOS Datagram Service
139TCP/UDPnetbios-ssnNetBIOS Session Service
140TCP/UDPemfis-data-
141TCP/UDPemfis-cntl-
142TCP/UDPbl-idm-
143TCP/UDPimapInternet Message Access Protocol (IMAP), management of electronic mail messages on a server
144TCP/UDPuma-
145TCP/UDPuaac-
146TCP/UDPiso-tp0-
147TCP/UDPiso-ip-
148TCP/UDPjargon-
149TCP/UDPaed-512-
150TCP/UDPsql-net-
151TCP/UDPhems-
152TCP/UDPbftpBackground File Transfer Program (BFTP)
153TCP/UDPsgmpSimple Gateway Monitoring Protocol (SGMP), a protocol for remote inspection and alteration of gateway management information
154TCP/UDPnetsc-prod-
155TCP/UDPnetsc-dev-
156TCP/UDPsqlsrvStructured Query Language (SQL) Service
157TCP/UDPknet-cmp-
158TCP/UDPpcmail-srvDistributed Mail System Protocol (DMSP, sometimes referred to as Pcmail)
159TCP/UDPnss-routing-
160TCP/UDPsgmp-traps-
161TCP/UDPsnmpSimple Network Management Protocol (SNMP)
162TCP/UDPsnmptrapSimple Network Management Protocol Trap (SNMPTRAP)
163TCP/UDPcmip-man-
164TCP/UDPcmip-agent-
165TCP/UDPxns-courier-
166TCP/UDPs-net-
167TCP/UDPnamp-
168TCP/UDPrsvd-
169TCP/UDPsend-
170TCP/UDPprint-srvNetwork PostScript print server
171TCP/UDPmultiplex-
172TCP/UDPcl/1-
173TCP/UDPxyplex-mux-
174TCP/UDPmailq-
175TCP/UDPvmnet-
176TCP/UDPgenrad-mux-
177TCP/UDPxdmcpX Display Manager Control Protocol (XDMCP), used for remote logins to an X Display Manager server
178TCP/UDPnextstep-
179TCP/UDPbgpBorder Gateway Protocol (BGP), used to exchange routing and reachability information among autofalsemous systems (AS) on the Internet
180TCP/UDPris-
181TCP/UDPunify-
182TCP/UDPaudit-
183TCP/UDPocbinder-
184TCP/UDPocserver-
185TCP/UDPremote-kis-
186TCP/UDPkis-
187TCP/UDPaci-
188TCP/UDPmumps-
189TCP/UDPqft-
190TCP/UDPgacp-
191TCP/UDPprospero-
192TCP/UDPosu-nms-
193TCP/UDPsrmp-
194TCP/UDPircInternet Relay Chat (IRC)
195TCP/UDPdn6-nlm-aud-
196TCP/UDPdn6-smm-red-
197TCP/UDPdls-
198TCP/UDPdls-mon-
199TCP/UDPsmuxSNMP Unix Multiplexer (SMUX)
200TCP/UDPsrc-
201TCP/UDPat-rtmpAppleTalk Routing Maintenance
202TCP/UDPat-nbp-
203TCP/UDPat-3-
204TCP/UDPat-echo-
205TCP/UDPat-5-
206TCP/UDPat-zis-
207TCP/UDPat-7-
208TCP/UDPat-8-
209TCP/UDPqmtpQuick Mail Transfer Protocol
210TCP/UDPz39.50ANSI Z39.50
211TCP/UDP914c/g-
212TCP/UDPanet-
213TCP/UDPipxInternetwork Packet Exchange (IPX)
214TCP/UDPvmpwscs-
215TCP/UDPsoftpc-
216TCP/UDPCAIlic-
217TCP/UDPdbase-
218TCP/UDPmppMessage posting protocol (MPP)
219TCP/UDPuarps-
220TCP/UDPimap3Internet Message Access Protocol (IMAP), version 3
221TCP/UDPfln-spx-
222TCP/UDPrsh-spx-
223TCP/UDPcdc-
224TCP/UDPmasqdialer-
225-241TCP/UDPno data-
242TCP/UDPdirect-
243TCP/UDPsur-meas-
244TCP/UDPinbusiness-
245TCP/UDPlink-
246TCP/UDPdsp3270-
247TCP/UDPsubntbcst_tftp-
248TCP/UDPbhfhs-
249-255TCP/UDPno data-
256TCP/UDPrap-
257TCP/UDPset-
258TCP/UDPno data-
259TCP/UDPesro-genEfficient Short Remote Operations (ESRO)
260TCP/UDPopenport-
261TCP/UDPnsiiops-
262TCP/UDParcisdmsArcisdms
263TCP/UDPhdap-
264TCP/UDPbgmpBorder Gateway Multicast Protocol (BGMP)
265TCP/UDPx-bone-ctl-
266TCP/UDPsst-
267TCP/UDPtd-service-
268TCP/UDPtd-replica-
269TCP/UDPmanet-
270TCP/UDPreserved-
271TCP/UDPpt-tls-
272-279TCP/UDPno data-
280TCP/UDPhttp-mgmthttp-mgmt
281TCP/UDPpersonal-link-
282TCP/UDPcableport-ax-
283TCP/UDPrescap-
284TCP/UDPcorerjd-
285TCP/UDPno data-
286TCP/UDPfxp-
287TCP/UDPk-block-
288-307TCP/UDPno data-
308TCPnovastorbakcupfalsevastor Online Backup
309TCP/UDPentrusttime-
310TCP/UDPbhmds-
311TCP/UDPasip-webadminMac OS X Server Admin, (truely AppleShare IP Web administration,)
312TCP/UDPvslmp-
313TCP/UDPmagenta-logic-
314TCP/UDPopalis-robot-
315TCP/UDPdpsi-
316TCP/UDPdecauth-
317TCP/UDPzannet-
318TCP/UDPpkix-timestampPKIX Time Stamp Protocol (TSP)
319UDPptp-eventPrecision Time Protocol (PTP) event messages
320UDPptp-generalPrecision Time Protocol (PTP) general messages
321TCP/UDPpip-
322TCP/UDPrtsps-
323TCP/UDPrpki-rtr-
324TCP/UDPrpki-rtr-tls-
325-332TCP/UDPno data-
333TCP/UDPtexar-
334-343TCP/UDPno data-
344TCP/UDPpdap-
345TCP/UDPpawserv-
346TCP/UDPzserv-
347TCP/UDPfatserv-
348TCP/UDPcsi-sgwp-
349TCP/UDPmftp-
350TCP/UDPmatip-type-aMapping of Airline Traffic over Internet Protocol (MATIP) type A
351TCP/UDPbhoettyMATIP type B
352TCP/UDPbhoedap4-
353TCP/UDPndsauth-
354TCP/UDPbh611-
355TCP/UDPdatex-asn-
356TCP/UDPcloanto-net-1cloanto-net-1 (used by Cloanto Amiga Explorer and VMs)
357TCP/UDPbhevent-
358TCP/UDPshrinkwrap-
359TCP/UDPnsrmp-
360TCP/UDPscoi2odialog-
361TCP/UDPsemantix-
362TCP/UDPsrssend-
363TCP/UDPrsvp_tunnel-
364TCP/UDPaurora-cmgr-
365TCP/UDPdtk-
366TCP/UDPodmrOn-Demand Mail Relay (ODMR)
367TCP/UDPmortgageware-
368TCP/UDPqbikgdp-
369TCP/UDPrpc2portmapRpc2portmap
370UDPcodaauth2securecast1, outgoing packets to NAI's SecureCast servers
370TCP/UDPcodaauth2codaauth2, Coda authentication server
371TCP/UDPclearcaseClearCase albd
372TCP/UDPulistproc-
373TCP/UDPlegent-1-
374TCP/UDPlegent-2-
375TCP/UDPhassle-
376TCP/UDPnip-
377TCP/UDPtnETOS-
378TCP/UDPdsETOS-
379TCP/UDPis99c-
380TCP/UDPis99s-
381TCP/UDPhp-collector-
382TCP/UDPhp-managed-node-
383TCP/UDPhp-alarm-mgrHP data alarm manager
384TCP/UDParnsA Remote Network Server System
385TCP/UDPibm-app-
386TCP/UDPasa-
387TCP/UDPaurpAURP (AppleTalk Update-based Routing Protocol)
388TCP/UDPunidata-ldmUnidata LDM near real-time data distribution protocol
389TCP/UDPldapLightweight Directory Access Protocol (LDAP)
390TCP/UDPuis-
391TCP/UDPsynotics-relay-
392TCP/UDPsynotics-broker-
393TCP/UDPmeta5-
394TCP/UDPembl-ndt-
395TCP/UDPnetcp-
396TCP/UDPnetware-ip-
397TCP/UDPmptn-
398TCP/UDPkryptolan-
399TCP/UDPiso-tsap-c2Digital Equipment Corporation DECnet+ (Phase V) over TCP/IP, RFC 1859
400TCP/UDPosb-sd-
401TCP/UDPupsUninterruptible power supply (UPS)
402TCP/UDPgenie-
403TCP/UDPdecap-
404TCP/UDPnced-
405TCP/UDPncld-
406TCP/UDPimsp-
407TCP/UDPtimbuktu-
408TCP/UDPprm-sm-
409TCP/UDPprm-nm-
410TCP/UDPdecladebug-
411TCP/UDPrmt-
412TCP/UDPsynoptics-trap-
413TCP/UDPsmsp-
414TCP/UDPinfoseek-
415TCP/UDPbnet-
416TCP/UDPsilverplatter-
417TCP/UDPonmux-
418TCP/UDPhyper-g-
419TCP/UDPariel1-
420TCP/UDPsmpte-
421TCP/UDPariel2-
422TCP/UDPariel3-
423TCP/UDPopc-job-start-
424TCP/UDPopc-job-track-
425TCP/UDPicad-el-
426TCP/UDPsmartsdp-
427TCP/UDPsvrlocService Location Protocol (SLP)
428TCP/UDPocs_cmu-
429TCP/UDPocs_amu-
430TCP/UDPutmpsd-
431TCP/UDPutmpcd-
432TCP/UDPiasd-
433TCP/UDPnnspNNSP, part of Network News Transfer Protocol
434TCP/UDPmobileip-agentMobile IP Agent, RFC 5944
435TCP/UDPmobilip-mn-
436TCP/UDPdna-cml-
437TCP/UDPcomscm-
438TCP/UDPdsfgw-
439TCP/UDPdasp-
440TCP/UDPsgcp-
441TCP/UDPdecvms-sysmgt-
442TCP/UDPcvc_hostd-
443TCP/UDPhttpsHypertext Transfer Protocol over TLS/SSL (HTTPS)
444TCP/UDPsnppSimple Network Paging Protocol (SNPP), RFC 1568
445TCP/UDPmicrosoft-dsMicrosoft-DS (Directory Services) SMB, file sharing
446TCP/UDPddm-rdb-
447TCP/UDPddm-dfm-
448TCP/UDPddm-ssl-
449TCP/UDPas-servermap-
450TCP/UDPtserver-
451TCP/UDPsfs-smp-net-
452TCP/UDPsfs-config-
453TCP/UDPcreativeserver-
454TCP/UDPcontentserver-
455TCP/UDPcreativepartnr-
456TCP/UDPmacon-tcp-
457TCP/UDPscohelp-
458TCP/UDPappleqtc-
459TCP/UDPampr-rcmd-
460TCP/UDPskronk-
461TCP/UDPdatasurfsrv-
462TCP/UDPdatasurfsrvsec-
463TCP/UDPalpes-
464TCP/UDPkpasswdKerberos Change/Set password
465TCPsubmissionsAuthenticated SMTP, over TLS/SSL (SMTPS)
466TCP/UDPdigital-vrc-
467TCP/UDPmylex-mapd-
468TCP/UDPphoturis-
469TCP/UDPrcp-
470TCP/UDPscx-proxy-
471TCP/UDPmondex-
472TCP/UDPljk-login-
473TCP/UDPhybrid-pop-
474TCP/UDPtn-tl-w1-
475TCP/UDPtcpnethaspsrvtcpnethaspsrv, Aladdin Kfalsewledge Systems Hasp services
476TCP/UDPtn-tl-fd1-
477TCP/UDPss7ns-
478TCP/UDPspsc-
479TCP/UDPiafserver-
480TCP/UDPiafdbase-
481TCP/UDPph-
482TCP/UDPbgs-nsi-
483TCP/UDPulpnet-
484TCP/UDPintegra-sme-
485TCP/UDPpowerburst-
486TCP/UDPavian-
487TCP/UDPsaft-
488TCP/UDPgss-http-
489TCP/UDPnest-protocol-
490TCP/UDPmicom-pfs-
491TCP/UDPgo-login-
492TCP/UDPticf-1-
493TCP/UDPticf-2-
494TCP/UDPpov-ray-
495TCP/UDPintecourier-
496TCP/UDPpim-rp-disc-
497TCP/UDPretrospectRetrospect
498TCP/UDPsiam-
499TCP/UDPiso-ill-
500TCP/UDPisakmpInternet Security Association and Key Management Protocol (ISAKMP) / Internet Key Exchange (IKE)
501TCP/UDPstmf-
502TCP/UDPmbapModbus Protocol
503TCP/UDPintrinsa-
504TCP/UDPcitadelCitadel, multiservice protocol for dedicated clients for the Citadel groupware system
505TCP/UDPmailbox-lm-
506TCP/UDPohimsrv-
507TCP/UDPcrs-
508TCP/UDPxvttp-
509TCP/UDPsnare-
510TCP/UDPfcpFirstClass Protocol (FCP), used by FirstClass client/server groupware system
511TCP/UDPpassgo-
512TCPexecRexec, Remote Process Execution
512UDPbiffcomsat, together with biff
513TCPloginrlogin
513UDPwhoWho
514UDPsyslogSyslog, used for system logging
515TCP/UDPprinterLine Printer Daemon (LPD), print service
516TCP/UDPvideotex-
517UDPtalkTalk
518UDPntalkNTalk
519TCP/UDPutime-
520TCPefsefs, extended file name server
520UDProuterRouting Information Protocol (RIP)
521UDPripngRouting Information Protocol Next Generation (RIPng)
522TCP/UDPulp-
523TCP/UDPibm-db2-
524TCP/UDPncpNetWare Core Protocol (NCP) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc.
525UDPtimedTimed, Timeserver
526TCP/UDPtempo-
527TCP/UDPstx-
528TCP/UDPcustix-
529TCP/UDPirc-serv-
530TCP/UDPcourierRemote procedure call (RPC)
531TCP/UDPconference-
532TCP/UDPnetnewsnetnews
533UDPnetwallnetwall, For Emergency Broadcasts
534TCP/UDPwindream-
535TCP/UDPiiop-
536TCP/UDPopalis-rdv-
537TCP/UDPnmsp-
538TCP/UDPgdomap-
539TCP/UDPapertus-ldp-
540TCPuucpUnix-to-Unix Copy Protocol (UUCP)
541TCP/UDPuucp-rlogin-
542TCP/UDPcommercecommerce (Commerce Applications)
543TCPkloginklogin, Kerberos login
544TCPkshellkshell, Kerberos Remote shell
545TCP/UDPappleqtcsrvr-
546TCP/UDPdhcpv6-clientDHCPv6 client
547TCP/UDPdhcpv6-serverDHCPv6 server
548TCP/UDPafpovertcpApple Filing Protocol (AFP) over TCP
549TCP/UDPidfp-
550TCP/UDPnew-rwhonew-rwho, new-who
551TCP/UDPcybercash-
552TCP/UDPdevshr-nts-
553TCP/UDPpirp-
554TCP/UDPrtspReal Time Streaming Protocol (RTSP)
555TCP/UDPdsf-
556TCPremotefsRemotefs, RFS, rfs_server
557TCP/UDPopenvms-sysipc-
558TCP/UDPsdnskmp-
559TCP/UDPteedtap-
560UDPrmonitorrmonitor, Remote Monitor
561UDPmonitormonitor
562TCP/UDPchshell-
563TCP/UDPnntpsNNTP over TLS/SSL (NNTPS)
564TCP/UDP9pfs-
565TCP/UDPwhoami-
566TCP/UDPstreettalk-
567TCP/UDPbanyan-rpc-
568TCP/UDPms-shuttle-
569TCP/UDPms-rome-
570-571TCP/UDPmeter-
572TCP/UDPsonar-
573TCP/UDPbanyan-vip-
574TCP/UDPftp-agent-
575TCP/UDPvemmi-
576TCP/UDPipcd-
577TCP/UDPvnas-
578TCP/UDPipdd-
579TCP/UDPdecbsrv-
580TCP/UDPsntp-heartbeat-
581TCP/UDPbdp-
582TCP/UDPscc-security-
583TCP/UDPphilips-vc-
584TCP/UDPkeyserver-
585TCP/UDPno data-
586TCP/UDPpassword-chg-
587TCP/UDPsubmissionemail message submission,, (SMTP)
588TCP/UDPcal-
589TCP/UDPeyelink-
590TCP/UDPtns-cml-
591TCPhttp-altFileMaker 6.0 (and later) Web Sharing (HTTP Alternate, also see port 80)
592TCP/UDPeudora-set-
593TCP/UDPhttp-rpc-epmapHTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server
594TCP/UDPtpip-
595TCP/UDPcab-protocol-
596TCP/UDPsmsd-
597TCP/UDPptcnameservice-
598TCP/UDPsco-websrvrmg3-
599TCP/UDPacp-
600TCP/UDPipcserver-
601TCPsyslog-connReliable Syslog Service - used for system logging
602TCP/UDPxmlrpc-beep-
603TCP/UDPidxp-
604TCPtunnelTUNNEL profile,, a protocol for BEEP peers to form an application layer tunnel
605TCP/UDPsoap-beep-
606TCP/UDPurm-
607TCP/UDPnqs-
608TCP/UDPsift-uft-
609TCP/UDPnpmp-trap-
610TCP/UDPnpmp-local-
611TCP/UDPnpmp-gui-
612TCP/UDPhmmp-ind-
613TCP/UDPhmmp-op-
614TCP/UDPsshell-
615TCP/UDPsco-inetmgr-
616TCP/UDPsco-sysmgr-
617TCP/UDPsco-dtmgr-
618TCP/UDPdei-icda-
619TCP/UDPcompaq-evm-
620TCP/UDPsco-websrvrmgr-
621TCP/UDPescp-ip-
622TCP/UDPcollaborator-
623UDPasf-rmcpASF Remote Management and Control Protocol (ASF-RMCP) & IPMI Remote Management Protocol
624TCP/UDPcryptoadmin-
625TCP/UDPdec_dlm-
626TCP/UDPasia-
627TCP/UDPpassgo-tivoli-
628TCP/UDPqmqp-
629TCP/UDP3com-amp3-
630TCP/UDPrda-
631TCP/UDPippsInternet Printing Protocol (IPP)
632TCP/UDPbmpp-
633TCP/UDPservstat-
634TCP/UDPginad-
635TCP/UDPrlzdbaseRLZ DBase
636TCP/UDPldapsLightweight Directory Access Protocol over TLS/SSL (LDAPS)
637TCP/UDPlanserver-
638TCP/UDPmcns-sec-
639TCP/UDPmsdpMSDP, Multicast Source Discovery Protocol
640TCP/UDPentrust-sps-
641TCP/UDPrepcmdSupportSoft Nexus Remote Command (control/listening), a proxy gateway connecting remote control traffic
642TCP/UDPesro-emsdp-
643TCP/UDPsanitySANity
644TCP/UDPdwr-
645TCP/UDPpssc-
646TCP/UDPldpLabel Distribution Protocol (LDP), a routing protocol used in MPLS networks
647TCPdhcp-failoverDHCP Failover protocol
648TCPrrpRegistry Registrar Protocol (RRP)
649TCP/UDPcadview-3d-
650TCP/UDPobex-
651TCP/UDPieee-mmsIEEE-MMS
652TCP/UDPhello-port-
653TCP/UDPrepscmdSupportSoft Nexus Remote Command (data), a proxy gateway connecting remote control traffic
654TCPaodvMedia Management System (MMS) Media Management Protocol (MMP)
655TCP/UDPtincTinc VPN daemon
656TCP/UDPspmp-
657TCP/UDPrmcIBM RMC (Remote monitoring and Control) protocol, used by System p5 AIX Integrated Virtualization Manager (IVM), and Hardware Management Console to connect managed logical partitions (LPAR) to enable dynamic partition reconfiguration
658TCP/UDPtenfold-
659TCP/UDPno data-
660TCP/UDPmac-srvr-adminMac OS X Server administration, version 10.4 and earlier
661TCP/UDPhap-
662TCP/UDPpftp-
663TCP/UDPpurenoise-
664TCP/UDPoob-ws-https-
665TCP/UDPsun-dr-
666TCP/UDPdoomDoom, first online first-person shooter
667TCP/UDPdisclose-
668TCP/UDPmecomm-
669TCP/UDPmeregister-
670TCP/UDPvacdsm-sws-
671TCP/UDPvacdsm-app-
672TCP/UDPvpps-qua-
673TCP/UDPcimplex-
674TCPacapApplication Configuration Access Protocol (ACAP)
675TCP/UDPdctp-
676TCP/UDPvpps-via-
677TCP/UDPvpp-
678TCP/UDPggf-ncp-
679TCP/UDPmrm-
680TCP/UDPentrust-aaas-
681TCP/UDPentrust-aams-
682TCP/UDPxfr-
683TCP/UDPcorba-iiop-
684TCP/UDPcorba-iiop-ssl-
685TCP/UDPmdc-portmapper-
686TCP/UDPhcp-wismar-
687TCP/UDPasipregistry-
688TCP/UDPrealm-rusdREALM-RUSD (ApplianceWare Server Appliance Management Protocol)
689TCP/UDPnmap-
690TCP/UDPvatpVelneo Application Transfer Protocol (VATP)
691TCPmsexch-routingMS Exchange Routing
692TCP/UDPhyperwave-isp-
693TCP/UDPconnendp-
694TCP/UDPha-clusterLinux-HA high-availability heartbeat
695TCPieee-mms-sslIEEE Media Management System over SSL (IEEE-MMS-SSL)
696TCP/UDPrushd-
697TCP/UDPuuidgen-
698UDPolsrOptimized Link State Routing (OLSR)
699TCP/UDPaccessnetwork-
700TCPeppExtensible Provisioning Protocol (EPP), a protocol for communication between domain name registries and registrars, RFC 5734
701TCPlmpLink Management Protocol (LMP),, a protocol that runs between a pair of falsedes and is used to manage traffic engineering (TE) links
702TCPiris-beepIRIS (Internet Registry Information Service) over BEEP (Blocks Extensible Exchange Protocol), RFC 3983
703TCP/UDPno data-
704TCP/UDPelcsd-
705TCP/UDPagentx-
706TCPsilcSecure Internet Live Conferencing (SILC)
707TCP/UDPborland-dsj-
708TCP/UDPno data-
709TCP/UDPentrust-kmsh-
710TCP/UDPentrust-ash-
711TCPcisco-tdpCisco Tag Distribution Protocol,,,-being replaced by the MPLS Label Distribution Protocol
712TCPtbrpfTopology Broadcast based on Reverse-Path Forwarding routing protocol, TBRPF, RFC 3684
713TCP/UDPiris-xpc-
714TCP/UDPiris-xpcs-
715TCP/UDPiris-lwz-
716-728TCP/UDPno data-
729TCP/UDPnetviewdm1-
730TCP/UDPnetviewdm2-
731TCP/UDPnetviewdm3-
732-740TCP/UDPno data-
741TCP/UDPnetgw-
742TCP/UDPnetrcs-
743TCP/UDPno data-
744TCP/UDPflexlm-
745-746TCP/UDPno data-
747TCP/UDPfujitsu-dev-
748TCP/UDPris-cm-
749TCP/UDPkerberos-admKerberos (protocol) administration
750UDPkerberos-ivkerberos-iv, Kerberos version IV
751TCP/UDPpump-
752TCP/UDPqrh-
753TCP/UDPrrhReverse Routing Header (RRH)
754TCP/UDPtelltell send
755-757TCP/UDPno data-
758TCP/UDPnlogin-
759TCP/UDPcon-
760TCP/UDPns-
761TCP/UDPrxe-
762TCP/UDPquotad-
763TCP/UDPcycleserv-
764TCP/UDPomserv-
765TCP/UDPwebster-
766TCP/UDPno data-
767TCP/UDPphonebook-
768TCP/UDPno data-
769TCP/UDPvid-
770TCP/UDPcadlock-
771TCP/UDPrtip-
772TCP/UDPcycleserv2-
773TCP/UDPsubmit-
774TCP/UDPrpasswd-
775TCP/UDPentomb-
776TCP/UDPwpages-
777TCP/UDPmultiling-http-
778-779TCP/UDPno data-
780TCP/UDPwpgs-
781-799TCP/UDPno data-
800TCP/UDPmdbs_daemonmdbs-daemon
801TCP/UDPdevice-
802TCP/UDPmbap-sMODBUS/TCP Security
803-809TCP/UDPno data-
810TCP/UDPfcp-udp-
811-827TCP/UDPno data-
828TCP/UDPitm-mcell-s-
829TCP/UDPpkix-3-ca-raCertificate Management Protocol
830TCP/UDPnetconf-sshNETCONF over SSH
831TCP/UDPnetconf-beepNETCONF over BEEP
832TCP/UDPnetconfsoaphttpNETCONF for SOAP over HTTPS
833TCP/UDPnetconfsoapbeepNETCONF for SOAP over BEEP
834-846TCP/UDPno data-
847TCPdhcp-failover2DHCP Failover protocol
848TCP/UDPgdoiGroup Domain Of Interpretation (GDOI) protocol
849-852TCP/UDPno data-
853TCP/UDPdomain-sDNS over TLS, RFC 7858
854TCP/UDPdlep-
855-859TCP/UDPno data-
860TCPiscsiiSCSI, RFC 3720
861TCP/UDPowamp-controlOWAMP control, RFC 4656
862TCP/UDPtwamp-controlTWAMP control, RFC 5357
863-872TCP/UDPno data-
873TCPrsyncrsync file synchronization protocol
874-885TCP/UDPno data-
886TCP/UDPiclcnet-locate-
887TCP/UDPiclcnet_svinfo-
888TCP/UDPcddbp-
889-899TCP/UDPno data-
900TCP/UDPomginitialrefs-
901TCP/UDPsmpnameres-
902TCP/UDPideafarm-door-
903TCP/UDPideafarm-panic-
904-909TCP/UDPno data-
910TCP/UDPkink-
911TCP/UDPxact-backup-
912TCP/UDPapex-mesh-
913TCP/UDPapex-edge-
914-952TCP/UDPno data-
953TCP/UDPrndcBIND remote name daemon control (RNDC)
954-988TCP/UDPno data-
989TCP/UDPftps-dataFTPS Protocol (data), FTP over TLS/SSL
990TCP/UDPftpsFTPS Protocol (control), FTP over TLS/SSL
991TCP/UDPnasNetnews Administration System (NAS)
992TCP/UDPtelnetsTelnet protocol over TLS/SSL
993TCP/UDPimapsInternet Message Access Protocol over TLS/SSL (IMAPS)
994TCP/UDPreserved-
995TCP/UDPpop3sPost Office Protocol 3 over TLS/SSL (POP3S)
996TCP/UDPvsinet-
997TCP/UDPmaitrd-
998TCP/UDPbusboy-
999TCP/UDPpuprouter-
1000TCP/UDPcadlock2-
1001TCP/UDPwebpush-
1002-1009TCP/UDPno data-
1010TCP/UDPsurf-
1011-1020TCP/UDPno data-
1021TCP/UDPexp1-
1022TCP/UDPexp2-
1023TCP/UDPreserved-

Unofficial, but in common use ports

Port numberTransport protocolDescription
0TCP/UDPIn some network programming APIs port zero means any free port automatically selected by OS or library.
9UDPWake-on-LAN
15TCPPreviously netstat service
80UDPQUIC, a transport protocol over UDP (still in draft as of March 2019), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2. QUIC has been renamed to HTTP/3, which is currently an Internet Draft.
81TCPTorPark onion routing
82UDPTorPark control
90TCP/UDPPointCast (dotcom)
300TCPThinLinc Web Access
443UDPQuick UDP Internet Connections (QUIC), a transport protocol over UDP (still in draft as of July 2018,), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2.
491TCPGO-Global remote access and application publishing software
514TCPRemote Shell, used to execute falsen-interactive commands on a remote system (Remote Shell, rsh, remsh)
564TCP9P (Plan 9)
585TCPLegacy use of Internet Message Access Protocol over TLS/SSL (IMAPS), falsew in use at port 993.
625TCPOpen Directory Proxy (ODProxy)
631TCP/UDPCommon Unix Printing System (CUPS) administration console (extension to IPP)
666TCPairserv-ng, aircrack-ng's server for remote-controlling wireless devices
751TCP/UDPkerberos_master, Kerberos authentication
752UDPpasswd_server, Kerberos password (kpasswd) server
753UDPuserreg_server, Kerberos userreg server
754TCPkrb5_prop, Kerberos v5 slave propagation
760TCP/UDPkrbupdate , Kerberos registration
782TCPConserver serial-console management server
783TCPSpamAssassin spamd daemon
808TCPMicrosoft Net.TCP Port Sharing Service
843TCPAdobe Flash
888TCPIBM Endpoint Manager Remote Control
897TCP/UDPBrocade SMI-S RPC
898TCP/UDPBrocade SMI-S RPC SSL
902TCP/UDPVMware ESXi
903TCPVMware ESXi
981TCPRemote HTTPS management for firewall devices running embedded Check Point VPN-1 software
987TCPMicrosoft Remote Web Workplace, a feature of Windows Small Business Server
994TCP/UDPInternet Relay Chat over TLS/SSL (IRCS).
1010TCPThinLinc web-based administration interface
1023TCP/UDPz/OS Network File System (NFS) (potentially ports 991-1023)

Some facts

  • Devices connected to the network can provide various types of services by running applications e.g. HTTP or FTP server.
  • To use the services provided by the server, we need to connect to it through a network, e.g. LAN or the Internet.
  • To connect to another device on the network, we need to know its network address e.g. the Calculla site is available at IP address 52.16.174.165.
  • There may be multiple services on one network device (on one network address). In order to be able to indicate which service we want to use, a port mechanism has been created, which assigns given port numbers to selected applications, e.g. the HTTP server listens at port number 80 by default.
  • For TCP/IP (and UDP/IP), the port is stored as sixteen bits, which gives 2162^{16} i.e. 65536 different ports.
  • We can assume that ports below 1024 are reserved for so-called well known applications. For this reason, they are sometimes called well-known ports. Examples of such ports are 80 (HTTP server), 22 (SSH server) or 443 (HTTPS server).
  • On most modern systems, to run the application on a port below 1024 need administrator privileges.
  • By design, assigning applications to well-known ports (0-1024) should not change over time. Ports with numbers 1024 and above, change frequently and can be reserved by interested entities.
  • The institution that formally manages the reservation of ports in the internet is IANA (Internet Assigned Numbers Authority). On the IANA website we can also find the current map of TCP and UDP ports.

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