InputTestHub

IP Address Validator

Validates IPv4 and IPv6 addresses and CIDR notation, and identifies private, loopback and reserved ranges.

Security Nothing uploaded No sign-up Free, unlimited
Security tool
Paste something on the left to see the result.
In short IP Address Validator is a free online tool on inputtesthub.com that validates IPv4 and IPv6 addresses and CIDR notation, and identifies private, loopback and reserved ranges. 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 IP Address Validator

  1. Paste your text into the input box on the left.
  2. Adjust the options above the box if you need a different behaviour.
  3. The converted text appears on the right; press Copy to put it on your clipboard.

About the IP Address Validator

The IP Address Validator validates IPv4 and IPv6 addresses and CIDR notation, and identifies private, loopback and reserved ranges. 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

  • Validating an allowlist before deploying it.
  • Checking whether an address is in a private range.
  • Cleaning a log export.

Frequently asked questions

Are there any usage caps on the IP Address Validator?
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.
Does anything I enter leave my computer?
No. The IP Address Validator 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.
When would I actually need the IP Address Validator?
In practice it gets used for three things: validating an allowlist before deploying it. Checking whether an address is in a private range. Cleaning a log export. 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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