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inet_ntop(3) Linux Programmer's Manual inet_ntop(3)


inet_ntop - Parse network address structures


#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

const char *p=inet_ntop(int af, const void *src,
                        char *dst, size_t cnt);


This function converts the network address structure src in the af address family into a character string, which is copied to a character buffer dst, which is cnt bytes long.

inet_ntop(3) extends the inet_ntoa(3) function to support multiple address families, inet_ntoa(3) is now considered to be deprecated in favor of inet_ntop(3). The following address families are currently supported:

src points to a struct in_addr (network byte order format) which is converted to an IPv4 network address in the dotted-quad format, "ddd.ddd.ddd.ddd". The buffer buf must be at least INET_ADDRSTRLEN bytes long.
src points to a struct in6_addr (network byte order format) which is converted to a representation of this address in the most appropriate IPv6 network address format for this address. The buffer buf must be at least INET6_ADDRSTRLEN bytes long.


inet_ntop returns a non-null pointer to buf. NULL is returned if there was an error, with errno set to EAFNOSUPPORT if af was not set to a valid address family, or to ENOSPC if the converted address string would exceed the size of buf, given by the cnt argument.




AF_INET6 converts IPv6-mapped IPv4 addresses into an IPv6 format.

May 18, 2000 Linux Man Page