The Network Uptime Technical Resource Library
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IP Protocol ReferenceIP Protocol Numbers
In the Internet Protocol version 4 (IPv4) [RFC791] there is a field, called "Protocol", to identify the next level protocol. In Internet Protocol version 6 (IPv6) [RFC1883] this field is called the "Next Header" field.
TCP and UDP Port Numbers
This is a comprehensive list of Well Known, Registered, and Dynamic/Private TCP and UDP port numbers.