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byteorder(3) — Linux manual page

BYTEORDER(3)             Library Functions ManualBYTEORDER(3)

NAME        top

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

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <arpa/inet.h>uint32_t htonl(uint32_thostlong);uint16_t htons(uint16_thostshort);uint32_t ntohl(uint32_tnetlong);uint16_t ntohs(uint16_tnetshort);

DESCRIPTION        top

       Thehtonl() function converts the unsigned integerhostlong from       host byte order to network byte order.       Thehtons() function converts the unsigned short integerhostshort       from host byte order to network byte order.       Thentohl() function converts the unsigned integernetlong from       network byte order to host byte order.       Thentohs() function converts the unsigned short integernetshort       from network byte order to host byte order.       On the i386 the host byte order is Least Significant Byte first,       whereas the network byte order, as used on the Internet, is Most       Significant Byte first.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │htonl(),htons(),ntohl(),ntohs()   │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

SEE ALSO        top

bswap(3),endian(3),gethostbyname(3),getservent(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17BYTEORDER(3)

Pages that refer to this page:bswap(3), endian(3), inet(3), pmdacache(3), sockaddr(3type), ip(7), signal-safety(7)

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