inet_pton and inet_aton

I typed the important words from your post into Google, and instantly found many helpful sites, including this one: http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=man&fname=/usr/share/catman/p_man/cat3c/inet_ntoa.z

Try Google on stuff like this. You will get your answer much more quickly (it took nearly one full day for me to notice your post), and you will learn something in the process

Mike