This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee  document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                   arpa_inet.h(7POSIX)

       The <arpa/inet.h> header shall define the in_port_t and in_addr_t types as described in <netinet/in.h>.

       The <arpa/inet.h> header shall define the in_addr structure as described in <netinet/in.h>.

       The  <arpa/inet.h>  header  shall  define the INET_ADDRSTRLEN and INET6_ADDRSTRLEN macros as described in
       <netinet/in.h>.

       The following shall be declared as functions, or defined as macros, or both. If functions  are  declared,
       function prototypes shall be provided.

           uint32_t htonl(uint32_t);
           uint16_t htons(uint16_t);
           uint32_t ntohl(uint32_t);
           uint16_t ntohs(uint16_t);

       The <arpa/inet.h> header shall define the uint32_t and uint16_t types as described in <inttypes.h>.

       The following shall be declared as functions and may also be defined as macros. Function prototypes shall
       be provided.

           in_addr_t    inet_addr(const char *);
           char        *inet_ntoa(struct in_addr);
           const char  *inet_ntop(int, const void *restrict, char *restrict,
                            socklen_t);
           int          inet_pton(int, const char *restrict, void *restrict);

       Inclusion  of  the  <arpa/inet.h>  header  may  also  make  visible  all  symbols from <netinet/in.h> and
       <inttypes.h>.

       Thefollowingsectionsareinformative.

       None.

       arpa/inet.h — definitions for internet operations

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

       None.

<inttypes.h>, <netinet_in.h>

       The System Interfaces volume of POSIX.1‐2017, htonl(), inet_addr(), inet_ntop()

       #include <arpa/inet.h>