Web Global Hurricane Electric BGP Toolkit https://bgp.tools/ can discover recursive DNS (“local DNS”) resolver IPs. https://radar.cloudflare.com/ (https://speed.cloudflare.com/ shows link to current ASN on Radar) China (for users in Mainland China) https://ping.huatuo.qq.com/ API Global https://ip.guide/ https://ifconfig.co/ https://ifconfig.me/ https://www.cloudflare.com/cdn-cgi/trace