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So if I use dig to do a reverse lookup I get:

$ dig

; <<>> DiG 9.6.0-APPLE-P2 <<>>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41277
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;          IN  A

;; ANSWER SECTION:       655360  IN  A

Using nslookup, I get:

$ nslookup

Non-authoritative answer:   name =

Can anyone tell me why dig refuses to do the reverse lookup?

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up vote 6 down vote accepted

dig wants the '-x' flag for reverse lookups on an IP.

Alternately, you can use the full form, 'dig PTR'

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