inetLib

inet_addr( ) - convert a dot notation Internet address to a long integer
inet_lnaof( ) - get the local address (host number) from the Internet address
inet_makeaddr_b( ) - form an Internet address from network and host numbers
inet_makeaddr( ) - form an Internet address from network and host numbers
inet_netof( ) - return the network number from an Internet address
inet_netof_string( ) - extract the network address in dot notation
inet_network( ) - convert an Internet network number from string to address
inet_ntoa_b( ) - convert an network address to dot notation, store it in a buffer
inet_ntoa( ) - convert a network address to dotted decimal notation
inet_aton( ) - convert a network address from dot notation, store in a structure

http://www.fys.uio.no/studier/kurs/fys4220/docs/vxworks/ref/inetLib.html#inet_addr