|dns_name4_domain(3)||Library Functions Manual||dns_name4_domain(3)|
NAME¶dns_name4_domain - construct host name for reverse lookup
void dns_name4_domain(char q[DNS_NAME4_DOMAIN], const char* ip);
DESCRIPTION¶dns_name4_domain is a low-level component of dns_name4. It converts an IP address such as 220.127.116.11 into a domain name such as 18.104.22.168.in-addr.arpa and places the packet-encoded domain name into q.
q is zero terminated.
q must have space for DNS_NAME4_DOMAIN bytes.