Network Byte Order

Network Byte Order = BIG ENDIAN
Bit Order = BIG ENDIAN

0x0A0B0C0D

0x0A 0x0B 0x0C 0x0D

b00001010 ...

http://en.wikipedia.org/wiki/Endianness
http://en.wikipedia.org/wiki/Bit_numbering

http://tools.ietf.org/html/rfc791 APPENDIX B Data Transmission Order
http://tools.ietf.org/html/rfc793
http://tools.ietf.org/html/rfc2360
http://tools.ietf.org/id/draft-newman-network-byte-order-01.txt

u_long htonl (u_long hostlong);
u_short htons (u_short hostshort);
u_long ntohl (u_long netlong);
u_short ntohs (u_short netshort);