Open Port Checker
Check whether a specific port is open on an FQDN (domain) or IP address from the Internet.
Supports URL input and Punycode (IDN) as well.
FQDN / IP address / URL
Port number (1-65535)
- Safe
- The results are not stored or published anywhere.
Notes
Check whether a port is open on a specified FQDN or IP address from the Internet.
Target input formats
The following formats are supported.
| FQDN | FQDN (domain/hostname) e.g. test.example.com |
|---|---|
| IP address | Global IPv4 address |
| URL | e.g. https://example.com |
Port number
A list of commonly used well-known ports
| 21 | File transfer (FTP) |
|---|---|
| 22 | Secure remote login (SSH) |
| 25 | Mail transfer (SMTP) |
| 53 | Name resolution (DNS) |
| 80 | Web traffic (HTTP) |
| 110 | Mail retrieval (POP3) |
| 143 | Mail retrieval (IMAP) |
| 443 | Secure web traffic (HTTPS) |
| 990 | Secure file transfer (FTPS) |
| 993 | Secure mail retrieval (IMAPS) |