The gethostbyname*() and gethostbyaddr*() functions are deprecated as among other things they are not IPv6 ready

[V-Z]

Applications should use getaddrinfo(3) and getnameinfo(3) instead. See also https://udrepper.livejournal.com/16116.html

[klymenko]

Thanks, they are used in https://github.com/ncbi/ncbi-vdb/blob/master/libs/kns/*/sysendpoint.c