Online utility for IP address calculations including netmask, broadcast and network addresses, wildcard mask, usable ranges, address format conversion etc. Accepts IP-s in hex/dec and also as one unsigned int number.
- Your IP address is: [unknown ip].
- The IP address identifies the network interface, the group of interfaces (broadcast, multicast), or the entire network (subnet).
- The IP addresses work on the third level of the OSI (network level).
- The IP address does not identify physical device (computer) in the unique way. Multiple computers can share the same IP address and assigned address can change (dynamic IP).
- IPv4 address (IP version 4) is the basis of the internet. Despite the appearance of IPv6, most of the services still use the IPv4 version.
- The IPv4 address is a 32-bit integer number. Most often it is represented as 4 bytes separated by a dot. For example IP address of calculla website is 184.108.40.206*.
*) This address may have changed since the time when this text was written.
What is the meaning of each calculator field ?
- Inputs data (host) - Enter IP address in any format for further calculations here. Just fill any of the "host" fields and other fields in this section will be filled automatically with a converted value.
- IP decimal (many formats) - IP address as four decimal numbers (from 0 to 255) separated by dots e.g. 10.20.30.40.
- IP hex (many formats) - IP address as hexadecimal number. You can enter four dot-separated numbers (e.g. aa.bb.cc.dd) or one 32-bit hex (e.g. aabbccdd) here.
- IP integer (unsigned int) - IP address as 32-bit unsigned integer number eg. 2864434397.
- IP class - calculated class of your IP address goes here (A,B,C,D). This field has historical meaning only, because IP classes are not in use anymore.
- Inputs data (network) - data in these section determine how your IP adress will be splitted into network (subnet) and host parts.
- network class - use this field if you're going to apply division based on network classes (A,B,C).
- first octet legal values - this field shows range of values, which can occur at the begin of IP address. This field depends on selected network class.
- network bits - number of bits reserved for network part according to selected network class.
- bity maski (net + subnet) - total number of bits used to address network including subnet. If we remove these bits, we'll got host bits only.
- subnet bits - number of bits reserved for subnet.
- network mask - bit mask allowing us to get network part from final IP address (bitwise AND operation).
- host mask (wildcard) - bit mask allowing us to get host part from final IP address (bitwise AND operation).
- maximum subnets - the maximum number of subnetworks possible to address. This value depends on number of subnet bits.
- hosts per subnet - the maximum number of hosts within sigle subnet. This value depends on number of host bits.
- Results - details about subnets
- subnet address - this is one of two special (reserved) addresses within created subnetwork. This address is related to the subnetwork itself and it's used by network devices internally.
- subnet broadcast address - second special (reserved) address. If we send packet to this address, it will be delivered to all hosts within subnetwork.
- hosts range - range of final IP addresses assigned to hosts within created subnet.
- subnet bitmap - diagram-like display of what are the roles of selected bits within final IP address. The meaning of used symbols is:
Also, one (class A), two (class B) or three (class C) bits are reserved to encode network class if used.
- n - network bits,
- s - subnet bits,
- h - host bits.
History of changes, improvements and fixes to this calculator
2015.02.07 New implementation: This calculator has been rewritten. The previous implementation was server-side (made in PHP). Each time the new value was entered or any button clicked, the full website reload was triggered. Current implementation works fully client-side - it's written in JavaScipt. No more reloads !
Tags and links to this website
Tags to Polish version:
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Links to external sites (leaving Calculla?)
Ancient version of this site - links
In December 2016 the Calculla website has been republished using new technologies and all calculators have been rewritten. Old version of the Calculla is still available through this link: v1.calculla.com. We left the version 1 of Calculla untouched for archival purposes.
Direct link to the old version: "Calculla v1" version of this calculator