[wp-trac] [WordPress Trac] #21994: Subdomains may not exceed 63 characters in length

[WordPress Trac]

#21994: Subdomains may not exceed 63 characters in length
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 Reporter:  humanshell          |       Owner:
     Type:  enhancement         |      Status:  new
 Priority:  low                 |   Milestone:  3.9
Component:  Networks and Sites  |     Version:  3.4
 Severity:  normal              |  Resolution:
 Keywords:  has-patch           |     Focuses:  multisite
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Changes (by jeremyfelt):

 * keywords:  needs-patch => has-patch


Comment:

 [https://core.trac.wordpress.org/attachment/ticket/21994/21994.diff
 21994.diff] adds a `strlen()` check to the new site process for both
 subdomain and domain. A max of 63 characters for the label and a max of
 255 characters for the full domain.

 RFC1034 doesn't really clarify, but per
 [http://tools.ietf.org/rfc/rfc2181.txt RFC 2181], 255 is the total limit
 for a domain name rather than the sum of all labels without separators.

 Another interesting note from [http://www.faqs.org/rfcs/rfc1034.html RFC
 1034] that this doesn't attempt to address:

 > Brother nodes may not have the same label, although the same label can
 be used for nodes which are not brothers.

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Ticket URL: <https://core.trac.wordpress.org/ticket/21994#comment:9>
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