CURLINFO\_PRIMARY\_IP(3) Library Functions Manual CURLINFO\_PRIMARY\_IP(3)

# [NAME](#NAME)

CURLINFO\_PRIMARY\_IP - IP address of last connection

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIMARY_IP, char **ip);
```

# [DESCRIPTION](#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)*](/man/os/curl/curl_easy_cleanup.3) on the corresponding curl handle.

# [PROTOCOLS](#PROTOCOLS)

This functionality affects all supported protocols

# [EXAMPLE](#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](#AVAILABILITY)

Added in curl 7.19.0

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_getinfo(3)*](/man/os/curl/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)*](/man/os/curl/libcurl-errors.3).

# [SEE ALSO](#SEE_ALSO)

[**CURLINFO\_LOCAL\_IP**(3)](/man/os/curl/CURLINFO_LOCAL_IP.3), [**CURLINFO\_LOCAL\_PORT**(3)](/man/os/curl/CURLINFO_LOCAL_PORT.3), [**CURLINFO\_PRIMARY\_PORT**(3)](/man/os/curl/CURLINFO_PRIMARY_PORT.3), [**curl\_easy\_getinfo**(3)](/man/os/curl/curl_easy_getinfo.3), [**curl\_easy\_setopt**(3)](/man/os/curl/curl_easy_setopt.3)

2026-10-31 libcurl

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Document: CURLINFO_PRIMARY_IP(3) from curl 8.23.0-r3 (Chainguard OS)
Source: https://github.com/curl/curl.git