djbdnscurve6:

Section: Misc. Reference Manual Pages (dnsname)
Updated: 1
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NAME

dnsname - recursive reverse lookup for IP address

SYNOPSIS

dnsname a.b.c.d

DESCRIPTION

dnsname 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.

REFERENCE

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