Dev UI — полный TCP-чекер для отладки. UDP: /udp.html. Доступ по паролю (/dev.html).
Proxy Checker
Formats: ip:port, ip:port:user:pass, ip:port@user:pass, scheme://user:pass@host:port. Max 200 proxies per check.
WordPress: use an iframe whose src is this checker’s public URL with a trailing slash (production: https://fine-proxy-checker.prx.ink/). The page and api.php share the checker’s origin; the main site may be on another server.