Scan the open TCP ports of your own public IP. Fast (32) or deep (65535). No key, no signup.
Free
One server, in security & testing. Scan the open TCP ports of your own public IP. Fast (32) or deep (65535). No key, no signup.
Security & Testing
Scan the open TCP ports of your own public IP. Fast (32) or deep (65535). No key, no signup.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.