CURLOPT_DNS_SERVERS(3) Library Functions Manual CURLOPT_DNS_SERVERS(3)
NAME
CURLOPT_DNS_SERVERS - DNS servers to use
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);
DESCRIPTION
Pass a char pointer that is the list of DNS servers to be used instead
of the system default. The format of the dns servers option is:
host[:port][,host[:port]]...
For example:
192.168.1.100,192.168.1.101,3.4.5.6
The application does not have to keep the string around after setting
this option.
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
DEFAULT
NULL
PROTOCOLS
This functionality affects all supported protocols
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_SERVERS,
"192.168.1.100:53,192.168.1.101");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
NOTES
This option requires that libcurl was built with a resolver backend that
supports this operation. The c-ares backend is the only such one.
AVAILABILITY
Added in curl 7.24.0
RETURN VALUE
curl_easy_setopt(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
CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_LO-
CAL_IP6(3)
libcurl 2026-07-12 CURLOPT_DNS_SERVERS(3)
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