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When did RFC1035 get thrown under the bus? According to it, with respect to domain name labels, "They must start with a letter" (2.3.1).
by goosehonk 7y ago
When did RFC1035 get thrown under the bus? According to it, with respect to domain name labels, "They must start with a letter" (2.3.1).
- jdnenej 7y agoAges ago I guess. 1password doesn't start with a letter either.
- knome 7y agoThe same document defines `in-addr.arpa` domains that have numeric labels. The mandate of a starting letter was for backwards compatibility, and mentions it in light of keeping names compatible with email servers and HOSTS files it was replacing. Taking a numeric label risks incompatibility with antiquated systems, but I doubt it will effect any modern browser.
- jlv2 7y agoLong, long ago. 3com.com wanted to exist.
- yellowapple 7y agoAmazingly, 3.com apparently didn't want to exist.
- jwilk 7y agoAll-digit host names have been allowed since 1989. https://tools.ietf.org/html/rfc1123#page-13 https://tools.ietf.org/html/rfc1123#page-13 One aspect of host name syntax is hereby changed: the restriction on the first character is relaxed to allow either a letter or a digit. Host software MUST support this more liberal syntax.
- goosehonk 7y agoHuh. Thanks! I really missed the memo there. I wonder why 1035 doesn’t mention that it is updated-by 1123.