how does one convert network byte order to machine byte order ? O.o

hey guys im trying to make a program that converts my ip to hex just like this website: http://www.miniwebtool.com/ip-address-to-hex-converter and i have not really been successful :L i tried to use ntohl (network to host long) />

so how does one do that ? i have tried so many things and still im not able to produce it /> help me please