ares_parse_ns_reply(3) on Linux
The text f4c52a904b26, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it.
Parse a reply to a DNS query of type NS into a hostent