For those familiar with using SOCKS proxies, you might want to know what makes SOCKS4 different from SOCKS5. In a nutshell, version 5 of the protocol is more advanced. Here is a list of features that only apply to ver. 5:

- Authentication

- Support for UDP Proxy

- DNS requests can be sent through the proxy

Which version you use depends on the configuration of the server you're connecting to. It will either support 4, 5 or both. SOCKS4a is an extension that fixes a common name resolution problem.

Checked by Socks Proxy Checker
Timeout: 5s

[Socks 5 List (66)]   SA   422ms   GB   485ms   US   562ms   IL   562ms   ES   609ms   US   609ms   RU   625ms   US   656ms   US   688ms   US   750ms   US   781ms   —   782ms   US   797ms   US   828ms   US   937ms   US   938ms   US   968ms   US   968ms   RU   984ms   US   985ms   —   1016ms   —   1016ms   —   1016ms   US   1062ms   US   1094ms   CN   1110ms   US   1204ms   US   1250ms   CA   1250ms   RU   1282ms   US   1297ms   US   1312ms   US   1328ms   US   1328ms   DK   1562ms   US   1609ms   US   1766ms   CN   1781ms   CN   1781ms   AU   1812ms   CN   1875ms   CN   1984ms   CO   2000ms   CN   2047ms   CN   2157ms   US   2265ms   US   2343ms   CN   2406ms   CN   2469ms   CN   2625ms   JP   2844ms   CN   3093ms   US   3265ms   US   3563ms   US   3625ms   CN   3734ms   VA   4032ms   US   4047ms   VE   4484ms   US   4719ms   IN   4844ms   US   5328ms   US   6453ms   CN   6469ms   IL   6735ms   US   9219ms