Socks 4 proxy list

The main differences between SOCKS5 and SOCKS4 are:

- SOCKS4 doesn't support authentication while SOCKS5 has the built-in mechanism to support a variety of authentications methods.

- SOCKS4 doesn't support UDP proxy while SOCKS5 does.

- SOCKS4 clients require a full support of DNS while SOCKS5 clients can rely on SOCKS5 to perform the DNS lookup.