IP Fragmentation Visualization

Original Packet Size (bytes):

MTU Size (bytes):

Changed Fields

Identification Field

Flags Field

Fragment Offset Field

Original IP Datagram

IP Header:

[Packet Data - 4000 bytes]

Key IP Fragmentation Fields

Identification (16 bits): Unique identifier assigned to all fragments of the same original datagram.

Flags (3 bits):

Bit 0: Reserved, must be zero
Bit 1: DF (Don't Fragment) - when set, the datagram cannot be fragmented
Bit 2: MF (More Fragments) - set for all fragments except the last one

Fragment Offset (13 bits): Indicates the position of this fragment relative to the beginning of the original datagram. Measured in 8-byte units.

Total Length: The length of each fragment (header + data) in bytes.