Underscoll (_) in hostnames and domain names

Jim Reid jim at rfc1035.com
Wed Jan 30 16:29:27 UTC 2002


>>>>> "Jacques" == Jacques  <jdh at ananzi.co.za> writes:

    Jacques> Why is it illegal to use underscolls
    Jacques> (_) like 123_345.yy.com  bind spits out

Because RFC1123 and RFC952 say so. Hostnames can't have underscores in
them. Domain names can. A legal host name can only be built from the
characters [a-zA-Z0-9-]. And "." obviously.



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