ipcheckr

An Open Source public IPv4 and IPv6 Web + JavaScript viewer designed to be simple and fast.

Key features:

• Implements Session Traversal Utilities for NAT (STUN) RFC 5389 (2008) standard based client through UDP to be fast
• IPv4 and IPv6 compatible
• Through CDN to warranty network speed
• Small and simple when you only need reveal your public IPs

Why this project?

To create a public IP checker compatible with IPv6 and IPv4, built on the philosophy that IPv6 comes first.

Fast. Free. Trusted. No tracking cookies¹. No ads.

And because it’s open source, anyone can see exactly how it works.

How this works

Unlike typical IP-checking websites, this project is a lightweight HTML + JavaScript client app.

It relies on a combination of Session Traversal Utilities for NAT (STUN) RFC 5389 and CDN HTTP(S) to resolve your public IP directly in the browser — without heavy backends or tracking.

This approach makes it:

• Fast: minimal latency, results are resolved on the client side, using the nearest CDN edge location.
• Private: no need to send extra data to third-party servers.
• Reliable: works seamlessly for both IPv4 and IPv6.

Quick Start

1. Dependencies

npm install

2. Developer mode

npm run dev

3. Build

npm run build

4. Preview the build

npm run preview

Footnotes

1. May set cookies of categories Strictly Necessary, Functional, Performance, and Targeting. ↩