| BYTEORDER(3) | Library Functions Manual | BYTEORDER(3) | 
htonl, htons,
  ntohl, ntohs —
#include <arpa/inet.h>
uint32_t
  
  htonl(uint32_t
    host32);
uint16_t
  
  htons(uint16_t
    host16);
uint32_t
  
  ntohl(uint32_t
    net32);
uint16_t
  
  ntohs(uint16_t
    net16);
On machines which have a byte order which is the same as the network order, these routines are defined as macros that expand to the value of their argument.
These routines are most often used in conjunction with Internet addresses and ports as returned by gethostbyname(3) and getservent(3).
byteorder functions appeared in
  4.2BSD.
| May 3, 2011 | NetBSD 10.0 |