Records Other Than PTR Records
Record types other than PTR records may also appear in the reverse DNS tree. In particular, encryption keys may be placed there for IPsec (RFC 4025), SSH (RFC 4255) and IKE (RFC 4322), for example. Less standardized usages include comments placed in TXT records and LOC records to identify the geophysical location of an IP address.
Read more about this topic: Reverse DNS Lookup
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