This really useful site that checks if SOCKS5 are LIVE or DIE
Another extremely useful thing is that it parses out SOCKS5 and ports if you copy paste a number of SOCKS5.
You can check unlimited SOCKS5 a day, but check Limit 100 SOCKS5 at a time.
Paste SOCKS5 into the box. You can click check Blacklist or no click Blacklist and click check