sockaddr_in(3type)                                          sockaddr_in(3type)

NAME
       sockaddr_in, in_addr, in_addr_t, in_port_t - IPv4 socket address

LIBRARY
       Standard C library (libc)

SYNOPSIS
       #include <netinet/in.h>

       struct sockaddr_in {
           sa_family_t     sin_family;     /* AF_INET */
           in_port_t       sin_port;       /* Port number */
           struct in_addr  sin_addr;       /* IPv4 address */
       };

       struct in_addr {
           in_addr_t s_addr;
       };

       typedef uint32_t in_addr_t;
       typedef uint16_t in_port_t;

DESCRIPTION
       sockaddr_in
              Describes an IPv4 Internet domain socket address.

              .sin_port and .sin_addr are stored in network byte order.

STANDARDS
       POSIX.1-2024.

HISTORY
       POSIX.1-2001.

SEE ALSO
       sockaddr(3type), sockaddr_in6(3type)

Linux man-pages 6.19              2025-11-25                sockaddr_in(3type)