http://whois.domaintools.com/

https://domainr.com/

https://www.ip2whois.com/

附whois源码：
https://github.com/io-developer/php-whois
https://github.com/ecoztas/whois-this-domain
3.https://github.com/Karyazilim/DoyosiWhois
https://github.com/mirhmousavi/Pois
https://github.com/whois-server-list/whois-server-list

格式化输出：
https://www.whoisxmlapi.com
https://whoapi.com