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Man Pages
dnsname(1) FreeBSD General Commands Manual dnsname(1)

dnsname - does a reverse lookup for the IP address

dnsname a.b.c.d

dnsname does a reverse lookup for the IP address a.b.c.d. It prints the first domain name for that address. If no domain names are listed in DNS, dnsname prints a blank line. You can list several IP addresses; dnsname prints each result on a separate line.

There is also a dnsfilter(1) program that reads IP addresses from its input and performs many reverse lookups in parallel.

Normally dnsname exits 0. If dnsname encounters a temporary problem that prevents it from determining the domain name, it prints an error message and exits 111.

dnsip(1), dnsipq(1), dnsmx(1), dnstxt(1), dnsqr(1), dnsq(1), dnstrace(1)

http://cr.yp.to/djbdns.html


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