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Man Pages
BYTEORDER(3) FreeBSD Library Functions Manual BYTEORDER(3)

htonl, htons, ntohl, ntohs
convert values between host and network byte order

Standard C Library (libc, -lc)

#include <arpa/inet.h>
or

#include <netinet/in.h>
uint32_t
htonl(uint32_t hostlong);
uint16_t
htons(uint16_t hostshort);
uint32_t
ntohl(uint32_t netlong);
uint16_t
ntohs(uint16_t netshort);

These routines convert 16 and 32 bit quantities between network byte order and host byte order. On machines which have a byte order which is the same as the network order, routines are defined as null macros.
These routines are most often used in conjunction with Internet addresses and ports as returned by gethostbyname(3) and getservent(3).

gethostbyname(3), getservent(3), byteorder(9)

The byteorder functions conform to IEEE Std 1003.1-2001 (“POSIX.1”).

The byteorder functions appeared in 4.2BSD.

On the VAX bytes are handled backwards from most everyone else in the world. This is not expected to be fixed in the near future.
March 20, 2005 FreeBSD 12.0-RELEASE

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