CURLINFO_LOCAL_IP(3) Library Functions Manual CURLINFO_LOCAL_IP(3)
NAME
CURLINFO_LOCAL_IP - local IP address of last connection
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LOCAL_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 local end of 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 quic and tcp
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_LOCAL_IP, &ip) && ip) {
printf("Local IP: %s\n", ip);
}
/* always cleanup */
curl_easy_cleanup(curl);
}
AVAILABILITY
Added in curl 7.21.0
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_PORT(3), CURLINFO_PRIMARY_IP(3), curl_easy_getinfo(3),
curl_easy_setopt(3)
libcurl 2026-03-23 CURLINFO_LOCAL_IP(3)
curl 8.19.0 - Generated Wed Mar 25 18:25:47 CDT 2026