UDP Example

Large UDP

Analyze a UDP packet carrying an ASCII payload. Examine how the length field accounts for header plus payload, and see source port, destination port, and checksum in action.

Hex Data

00 50 12 34 02 00 00 00 48 65 6C 6C 6F 20 57 6F 72 6C 64
Note: Contains Hello World ASCII payload, length 27 bytes
Load in Visualizer
payload

Field Breakdown

Source Port
Source port number (0-65535)
80
HTTP
Destination Port
Destination port number (0-65535)
4660
Length
Length of UDP header and data in bytes (minimum 8)
512
Checksum
Checksum for error detection (optional in IPv4, mandatory in IPv6)
0x0000

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