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.

       dnsname - does a reverse lookup for the IP address

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

       http://cr.yp.to/djbdns.htmldnsname(1)

dnsnamea.b.c.d