网页工具
Port Checker
Test if a TCP port is open on any host — check firewall rules, service availability, and connectivity
服务端查询 — 不存储您的数据
免费
无广告
无需注册账户
Check a Port
21 FTP
22 SSH
25 SMTP
53 DNS
80 HTTP
443 HTTPS
3306 MySQL
5432 PostgreSQL
6379 Redis
8080 HTTP Alt
Enter a host and port above to test connectivity. Click a common port to quick-check.