.TH dns_name4_domain 3 .SH NAME dns_name4_domain \- construct host name for reverse lookup .SH SYNTAX .B #include int \fBdns_name4_domain\fP(char \fIq\fR[DNS_NAME4_DOMAIN], const char* \fIip\fR[4]); .SH DESCRIPTION dns_name4_domain is a low-level component of dns_name4. It converts an IP address such as 1.2.3.4 into a domain name such as 4.3.2.1.in-addr.arpa and places the packet-encoded domain name into \fIq\fR. .SH "SEE ALSO" dns_name4(3), dns_name6_domain(3)