InputTestHub

Port Number Lookup

Searchable reference of well-known and registered TCP and UDP ports and the services that use them.

Developer Nothing uploaded No sign-up Free, unlimited
Developer tool
Fill in the fields and press Generate.
In short Port Number Lookup is a free online tool on inputtesthub.com that searchable reference of well-known and registered TCP and UDP ports and the services that use them. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Port Number Lookup

  1. Fill in the fields with your own details.
  2. The generated code updates live in the output panel.
  3. Copy the code and paste it into your page, file or CMS.

About the Port Number Lookup

The Port Number Lookup searchable reference of well-known and registered TCP and UDP ports and the services that use them. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Opening the right port in a firewall.
  • Identifying an unexpected listening port.
  • Documenting a deployment.

Frequently asked questions

Does the Port Number Lookup cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Can you see what I put into this tool?
No. The Port Number Lookup runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
Who is the Port Number Lookup for?
In practice it gets used for three things: opening the right port in a firewall. Identifying an unexpected listening port. Documenting a deployment. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there an app version?
Yes. The page is responsive and the tool works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

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