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       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.


       arpa/inet.h — definitions for internet operations


       #include <arpa/inet.h>


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

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

       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

       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,
           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>.

       The following sections are informative.








       <inttypes.h>, <netinet_in.h>

       The System Interfaces volume of POSIX.1‐2008, htonl(), inet_addr(), inet_ntop()


       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  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 .

       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 .