xa- There are some sites to check it - (If your IP is Blacklisted on more than 6-7 sites then it may cause connection issues with other sites). Most IPs of VPNs are Blacklisted. https://mxtoolbox.com/blacklists.aspx https://whatismyipaddress.com/blacklist-check https://www.whatismyip.com/blacklist-check/ https://dnschecker.org/ip-blacklist-checker.php https://dnschecker.org/ip-blacklist-checker.php https://www.site24x7.com/tools/blacklist-check.html https://www.ipvoid.com/ip-blacklist-check/ For Quick checkup, you can try sites like - http://check2ip.com/ Why do IP addresses get blacklisted? - Read this Article How to Remove an IP Address from a Blacklist - Read this Article One more Short Article What If My IP Address Remains On A Blacklist Or Blocklist?