Experimental RRs
Because DNS is ubiquitous, it is a handy mechanism for many things. Experimental RRs represent suggested uses of DNS, and might make it as an Internet standard in the future. If more appropriate or elegant ways to implement the given mechanisms are developed, they will probably be preferred to the existing RRs.
AFSDB (AFS Database Location)
Defined in RFC 1183:
domainname AFSDB subtype# host
The AFSDB record is used for cross-site AFS and DCE/NCA network filesystem mounting. Subtype 1 is used for AFS, and subtype 2 is used for DCE. If you use the AFS or DCE filesystem, the AFSDB record is documented in the accompanying documents.
ISDN
Defined in RFC 1183, section 3.2:
domainname ISDN ISDN-address# sub-address#
This RR ...
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