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Can (domain name) subdomains have an underscore “_” in it?
...o some DNS client programs.
See also the original DNS specification, RFC 1034, section 3.5
"Preferred name syntax" but read it carefully.
Domains with underscores are very common in the wild. Check _jabber._tcp.gmail.com or _sip._udp.apnic.net.
Other RFC mentioned here deal with different things...
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answered Mar 13 '13 at 15:34
ejkujanejkujan
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