# User Datagram Protocol (UDP) Packet Header

**URL:** <https://forum.networklessons.com/t/user-datagram-protocol-udp-packet-header/58773>\
**Category:** Lessons Discussion\
**Created:** [January 13, 2026, 4:05pm UTC](https://forum.networklessons.com/t/user-datagram-protocol-udp-packet-header/58773 "2026-01-13T16:05:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\
**Post date:** [January 13, 2026, 4:05pm UTC](https://forum.networklessons.com/t/user-datagram-protocol-udp-packet-header/58773/1 "2026-01-13T16:05:03Z")

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This topic is to discuss the following lesson:

> **[User Datagram Protocol (UDP) Packet Header](https://networklessons.com/ip-routing/user-datagram-protocol-udp-packet-header)**
>
> The UDP header is a 8-byte structure that defines port numbers, packet length, and optional checksum for unreliable datagram delivery.