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Although this is an old question, I worked around like this: In components/modules/namecheap/apis/namecheap_api.php // original code if (!isset($args['ClientIP'])) { $args['ClientIP'] = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '127.0.0.1'; } // added this line: // I used my own IPv4, but this worked as well (in another panel) $args['ClientIP'] = '127.0.0.1'; And yes, namecheap still does not support IPv6.