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Concise Guide to DNS and BIND, The by Nicolai Langfeldt

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Obsolete RRs

Because DNS is ubiquitous, it is very tempting to use it for many things. Several uses have been suggested, and the following are those uses that have already proven unsuitable.

EID (Endpoint Identifier)

Defined in an Internet Draft, expired as of April 1996.

See the NIMROD record type for further information.

GPOS (Geographical Position)

Defined in RFC 1712.

The RFC has been withdrawn, and the LOC (location) record was defined in RFC 1876. The GPOS record lacks the size and precision fields of the LOC record.

ISDN (ISDN Address)

Defined in RFC 1183, section 3.1.

The ISDN, X25, and RT RRs were meant to hold routing information. They are classified as experimental. In RFC 1183, they appear under the heading "Route Binding." It ...

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