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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_ADDRESS_SCOPE
Section: 3
Source: libcurl
See-also:
- CURLOPT_DEBUGFUNCTION (3)
- CURLOPT_STDERR (3)
---
# NAME
CURLOPT_ADDRESS_SCOPE - scope id for IPv6 addresses
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ADDRESS_SCOPE, long scope);
~~~
# DESCRIPTION
Pass a long specifying the scope id value to use when connecting to IPv6 addresses.
# DEFAULT
0
# PROTOCOLS
All, when using IPv6
# EXAMPLE
~~~c
#include <net/if.h> /* for if_nametoindex() */
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode ret;
long my_scope_id;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
my_scope_id = if_nametoindex("eth0");
curl_easy_setopt(curl, CURLOPT_ADDRESS_SCOPE, my_scope_id);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
~~~
# AVAILABILITY
Added in 7.19.0
# RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a negative value.
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