On Wed, Aug 29, 2012 at 01:01:52PM +0200, Bernhard Schmidt wrote:
> ok: 134.130.87.26 -PTR-> domaindnszones.geotechnik.rwth-aachen.de
> -A-> 134.130.87.26
> ok:               -PTR-> forestdnszones.geotechnik.rwth-aachen.de
> -A-> 134.130.87.26
> ok:               -PTR-> gc._msdcs.geotechnik.rwth-aachen.de

This is invalid. A label may not include the underline character.

| <domain> ::= <subdomain> | " "
| <subdomain> ::= <label> | <subdomain> "." <label>
| <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]
| <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
| <let-dig-hyp> ::= <let-dig> | "-"
| <let-dig> ::= <letter> | <digit>
| <letter> ::= any one of the 52 alphabetic characters A through Z in
| upper case and a through z in lower case
| <digit> ::= any one of the ten digits 0 through 9
[RFC 1034]

The only exceptions are specified in other RFC, like the SRV record and
for the future TLS-certificates.

Bastian

-- 
Our way is peace.
                -- Septimus, the Son Worshiper, "Bread and Circuses",
                   stardate 4040.7.

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