Port check
Open port checker
Test which common services answer from the internet on a domain’s server address: web, FTP, SSH, mail, databases, Redis and control panel ports. Anything open that you did not mean to publish is a door worth closing.
We check from the outside, the way visitors see your site, and keep a simple log of sites checked. Privacy policy.
How it works
What this checks
- Web ports 80 and 443, which should be open, with a warning when HTTPS does not answer.
- File transfer and shell FTP on 21, which sends passwords unencrypted, and SSH on 22.
- Mail SMTP, submission, IMAP and POP3 ports: normal on a mail server, worth a look on a web only server.
- Databases and caches MySQL or MariaDB, PostgreSQL and Redis, which should never answer from the internet.
- Alternate web ports 8080 and 8443, often a control panel, proxy or test site. This is a fixed list of common ports, not a full scan.