Port Scanner
Test a constrained list of common TCP ports on an authorized public host.
- Free to use· No payment required
- No account· Start immediately
- Protected request· Only the public destination is sent
Purpose-built workflow
Check common ports on an authorized public host
- 18 common ports
- Authorization gate
- Private IP blocking
- InputEnter a public destination
- RefineConfirm authorization and enter the host
- ReviewReview open and closed ports visually
- FinishDownload the controlled scan report
Authorized diagnostics
What does Port Scanner do?
Checking which common ports are open helps diagnose services on a host you own or manage. This scanner tests a constrained list of common TCP ports on a public host you confirm you are authorized to test.
Scanning is performed by a server endpoint with a fixed port list, private-address blocking, and an explicit authorization check.
Common use cases
Step-by-step
How to use this tool
- 1
Add content to Port Scanner
Enter a public URL, domain, or authorized host.
- 2
Configure the result
Choose the diagnostic you need and confirm authorization where requested.
- 3
Review and export
Review the returned records, status, or response details.
Tips for a better result
- Start with a representative sample before running a large port scanner workflow.
- Only run network diagnostics against public systems you own or are authorized to test.
- Review quality, compatibility, and output size before publishing or sharing the result.
Keep working
Related workflows
Learn from primary sources
Trusted references
Use these standards and official guides when you need deeper technical detail.
FAQ
Common questions
Everything you need to know before processing your files.
Only public hosts you confirm you are authorized to test; private and reserved addresses are blocked and you must accept an authorization notice.
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