WKS 11 a well known service description [RFC1035]
Is said to be deprecated.
GPOS 27 Geographical Position [RFC1712]
Is an experimental record with a rather confusing implementation status (and a specification
bug that may cause interoperability problems, see
http://www.rfc-
editor.org/errata_search.php?rfc=1712. The LOC record supplies all functionality that GPOS
intended to provide.
KX 36 Key Exchanger [RFC2230]
Implemented on the trunk
DHCID 49 DHCID [RFC4701]
Implemented on the trunk
HIP 55 Host Identity Protocol [RFC5205]
Implemented on the trunk
I expect a release shortly.
FWIW, from the currently assignments by IANA the following are not implemented
(seee
http://www.iana.org/assignments/dns-parameters)
'MD' => 3, # RFC 1035, Section 3.3.4 (obsolete) NOT IMPLEMENTED
'MF' => 4, # RFC 1035, Section 3.3.5 (obsolete) NOT IMPLEMENTED
'WKS' => 11, # RFC 1035, Section 3.4.2 (deprecated) NOT IMPLEMENTED
'NSAP_PTR' => 23, # RFC 1348 (obsolete by RFC 1637) NOT IMPLEMENTED
'GPOS' => 27, # RFC 1712 (obsolete ?) NOT IMPLEMENTED
'ATMA' => 34, # non-standard NOT IMPLEMENTED
'A6' => 38, # RFC3226, RFC2874. See RFC 3363 made A6 exp. NOT IMPLEMENTED
'SINK' => 40, # non-standard NOT IMPLEMENTED
'NINFO' => 56, # non-standard NOT IMPLEMENTED
'RKEY' => 57, # non-standard NOT IMPLEMENTED
'TA' => 32768, # non-standard NOT IMPLEMENTED
For those marked non-standard the specification may be hard to obtain.