IPv4 Example

Fragmented Packet

Analyze an IPv4 packet with fragmentation flags set. Understand how the MF flag and fragment offset fields indicate that more fragments follow, and inspect fragmentation-related header fields.

Hex Data

45 00 00 5C 56 78 20 00 3F 11 AB CD C0 A8 01 02 08 08 08 08
Note: MF flag set to 1, indicates more fragments follow
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fragmentation

Field Breakdown

Version
IP version (always 4 for IPv4)
69
IHL
Internet Header Length in 32-bit words (minimum 5)
69
DSCP
Differentiated Services Code Point (QoS)
0b000000
ECN
Explicit Congestion Notification
0b00
Total Length
Total length of IP packet in bytes (header + data)
92
Identification
Unique identifier for fragmentation reassembly
0x5678
Flags
Control flags (Reserved, DF, MF)
0b100000
Fragment Offset
Position of fragment in original datagram (in 8-byte blocks)
8192
TTL
Time To Live (hop limit)
63
Protocol
Protocol used in data portion
17
UDP
Header Checksum
Checksum of IP header only
0xABCD
Source IP
Source IP address
0x-3F57FEFE
Destination IP
Destination IP address
0x08080808

Related Resources

IPv4 Protocol Visualizer - Parse & Analyze IPv4 PacketsIPv4 Header Format and Fields Explained - ByteLensIPv4 vs IPv6 - Key Differences and Migration GuideIP Address Protocol - What is IP? IPv4 vs IPv6 Explained

About IPv4

Internet Protocol version 4 (RFC 791)

Fields: 13
Endianness: big
Specification: RFC 791