Free tool

Port Checker

Check whether your mail server, website, cPanel, FTP and SSH ports are reachable from the internet — with the server’s greeting and a TCP ping for each check.

Enter your domain, mail server or server IP address. We test common hosting ports only, from our UK servers.

Email ports

SMTP (25, 587, 465), IMAP (143, 993) and POP3 (110, 995) — see which your mail app can use, and the greeting your mail server sends.

Web & cPanel

HTTP, HTTPS, cPanel, WHM and Webmail. If they’re open here but won’t load for you, the block is between you and the server.

TCP ping

We time four connections to an open port, so you can see the server is up and how quickly it answers — even when it ignores normal ping.

Guides

Email ports explainedWhich ports to use in Outlook, Apple Mail and phones — and how to fix connection errors
Blocked by the firewall?Find your IP and get it unblocked
SPF, DKIM and DMARC explainedConnected but emails go to spam?
SSL certificate errors explainedPort open but a certificate warning?

Frequently asked questions

The checker says a port is open, but I still can’t connect.
Then the server is fine and the block is between you and it. Common causes: your IP has been blocked by the server’s firewall after failed logins (find your IP and send it to support), your network or antivirus blocks the port, or your ISP blocks outgoing port 25.
Which ports should my email app use?
Incoming: IMAP on 993 (SSL). Outgoing: SMTP on 465 (SSL) or 587 (STARTTLS), with authentication turned on. Don’t use 25 in a mail app — many broadband providers block it. See email ports explained.
What’s the difference between closed and no response?
Closed means the server answered and said nothing is listening there. No response means nothing answered at all — usually a firewall dropping the connection, sometimes a server that’s down or an address that’s wrong.
Can I check any port?
No — only the common hosting ports listed, and only public addresses. That keeps the tool useful for checking your own services without it being used to scan other people’s networks.
Why is TCP ping different from normal ping?
Normal ping uses ICMP, which many servers and firewalls ignore. TCP ping times a real connection to a service port, so it works wherever that service is reachable and reflects what your visitors and mail apps actually experience.

More free tools

DNS Propagation CheckerSee whether a DNS change has reached Google, Cloudflare, Quad9 and other major providers. Email CheckerTest SPF, DKIM, DMARC and MX — find out why emails go to spam. SSL CheckerCheck a certificate’s expiry, hostname match, trust chain and HTTPS redirect. Port CheckerTest email, web, cPanel, FTP and SSH ports, with TCP ping. What’s My IP?Your public IP address, ISP and approximate location — ready to copy for support. Blocked? Backup IP checkCan’t load this site or seeing a captcha loop? Get your IP from our separate server.

Hosting with a firewall that’s on your side

UK and South Africa hosting with email, cPanel and free SSL — and real people to unblock you when you need it.

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