RFC 1123, "Requirements for Internet Hosts - Application and Support", October 1989

Note: This RFC has been updated by RFC 1349, RFC 2181, RFC 5321, RFC 5966, RFC 7766, RFC 9210

Errata ID: 558
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Ben Harris
Date Reported: 2003-02-12

Section 2.5 says:

Host names of up to 635 characters |2.1 |x| | | | | 

It should say:

Host names of up to 63 characters |2.1 |x| | | | | 

Notes:

Section 2.1 says "Host software MUST handle host names of up to 63 characters" and doesn't mention the number 635 at all.

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