CALCULATOR
MTU table
MTU (Maximum Transmission Unit) values assigned to given network type.

MTU table

Network typeMTUNotes
Maximum MTU
65535
Maximum theoretical MTU defined in RFC1191 document
Hyperchannel
65535
-
16Mbit/s IBM Token Ring
17914
-
IEEE 802.4
8166
-
WLAN (802.11)
7981
-
IEEE 802.5 (4Mbit/s)
4464
-
FDDI
4352
-
Wideband Network
2048
-
IEEE 802.5 (4Mbit/s)
2002
-
Experimental Ethernet
1536
-
Ethernet
1500
-
Point-to-Point
1500
-
IEEE 802.3
1492
-
SLIP
1006
-
ARPANET
1006
-
X.26 network
576
-
DEC IP Portal
544
-
NETBIOS
512
-
IEEE 802/Source-Route Bridge
508
-
ARCNET
508
-
Point-to-Point (low-delay)
296
-
Internet IPv4
Vary on network configuration. Minimum possible value is 68 bytes
Internet IPv6
Vary on network configuration. Minimum possible value is 1280 bytes
Minimal MTU
68
Minimal possible MTU defined in RFC1191 document

Some facts

  • MTU is a maximum number of payload bytes in datagram.
  • MTU determines maximum datagram size, which can be transmitted without fragmentation. Attempt to send more data than defined MTU number, causes division of the original message into smaller pieces. Size of each piece is less or equal to MTU.
  • Greater MTU values allow to use bandwith more efficiently (less overhead), but causes network to be less resistant to transmit errors. This is why optimal MTU depends on environment and network conditions.
  • MTU value range (min/max) is often defined by the protocol being used. For example: The typical Ethernet Frame payload valid size is 46 - 1500 bytes (octets).

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