.TH s/qmail: dnsptr 8
.SH NAME
dnsptr
.SH SYNOPSIS
.B dnsptr 
.I IPv4 
or
.IR IPv6 .
.SH DESCRIPTION
.B dnsptr
does a DNS
.I PTR
lookup and displays the retrieved
.IR fqdn .
.SH "EXIT CODES"
.B dnsptr
always returns
.I 0 
except for wrong IP address 
formats while returning 
.IR 100 .
.SH "SEE ALSO"
dnscname(8),
dnsmxip(8),
dnsfq(8),
dnsip(8),
dnstxt(8).