---
name: "CURLOPT_DNS_LOCAL_IP4"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_DNS_LOCAL_IP4"
---

# CURLOPT\_DNS\_LOCAL\_IP4(3)

IPv4 address to bind DNS resolves to

## NAME

CURLOPT\_DNS\_LOCAL\_IP4 - IPv4 address to bind DNS resolves to

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address);
```

## DESCRIPTION

Set the local IPv4 *address* that the resolver should bind to. The argument should be of type char \* and contain a single numerical IPv4 address as a string. Set this option to NULL to use the default setting (do not bind to a specific IP address).

The application does not have to keep the string around after setting this option.

## DEFAULT

NULL

## PROTOCOLS

All

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
    curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP4, "192.168.0.14");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

This option requires that libcurl was built with a resolver backend that supports this operation. The c-ares backend is the only such one.

Added in 7.33.0

## RETURN VALUE

Returns CURLE\_OK if the option is supported, CURLE\_UNKNOWN\_OPTION if not, CURLE\_NOT\_BUILT\_IN if support was disabled at compile-time, or CURLE\_BAD\_FUNCTION\_ARGUMENT when given a bad address.

## SEE ALSO

[**CURLOPT\_DNS\_INTERFACE**(3)](/CURLOPT_DNS_INTERFACE/3.md), [**CURLOPT\_DNS\_LOCAL\_IP6**(3)](/CURLOPT_DNS_LOCAL_IP6/3.md), [**CURLOPT\_DNS\_SERVERS**(3)](/CURLOPT_DNS_SERVERS/3.md)