UDP Example

Maximum UDP

Explore a near-maximum length UDP datagram with port 65535. Understand how UDP length field limits apply and how the header scales with larger payloads.

Hex Data

FF FF FF FF 07 09 FF FF 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10
Note: Port 65535, total length 1809 bytes (close to theoretical maximum 65535)
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Field Breakdown

Source Port
Source port number (0-65535)
65535
Destination Port
Destination port number (0-65535)
65535
Length
Length of UDP header and data in bytes (minimum 8)
1801
Checksum
Checksum for error detection (optional in IPv4, mandatory in IPv6)
0xFFFF

Related Resources

UDP Protocol Visualizer - Parse & Analyze UDP PacketsUDP Header Format and Fields Explained - ByteLensSource Port - Definition, Range, and Usage in NetworkingDestination Port - Definition, Range, and Usage in Networking

About UDP

User Datagram Protocol (RFC 768)

Fields: 4
Endianness: big
Specification: RFC 768