CURLINFO_PRIMARY_IP(3) Introduction to Library Functions

NAME

CURLINFO_PRIMARY_IP - IP address of last connection

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIMARY_IP, char **ip);

DESCRIPTION

Pass a pointer to a char pointer to receive the pointer to a
null-terminated string holding the IP address of the most recent
connection done with this curl handle. This string may be IPv6 when
that is enabled. Note that you get a pointer to a memory area that is
reused at next request so you need to copy the string if you want to
keep the information.

The ip pointer is NULL or points to private memory. You must not free
it. The memory gets freed automatically when you call
curl_easy_cleanup(3) on the corresponding curl handle.

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
char *ip;
CURLcode result;
CURL *curl = curl_easy_init();

curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

/* Perform the transfer */
result = curl_easy_perform(curl);
/* Check for errors */
if((result == CURLE_OK) &&
!curl_easy_getinfo(curl, CURLINFO_PRIMARY_IP, &ip) && ip) {
printf("IP: %s\n", ip);
}

/* always cleanup */
curl_easy_cleanup(curl);
}

AVAILABILITY

Added in curl 7.19.0

RETURN VALUE

curl_easy_getinfo(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).

SEE ALSO

CURLINFO_LOCAL_IP(3), CURLINFO_LOCAL_PORT(3),
CURLINFO_PRIMARY_PORT(3), curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl 2026-01-08 CURLINFO_PRIMARY_IP(3)