CURLOPT_IPRESOLVE

CURLOPT_IPRESOLVE is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_IPRESOLVE — Allows an application to select what kind of IP addresses to use when resolving host names. This is only interesting when using host names that resolve addresses using more than one version of IP, possible values are CURL_IPRESOLVE_WHATEVER, CURL_IPRESOLVE_V4, CURL_IPRESOLVE_V6, by default CURL_IPRESOLVE_WHATEVER. Available as of cURL 7.10.8.

CURLOPT_IPRESOLVE = 113;