dnsname - does a reverse lookup for the IP address
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),