CIDR Match — IP Range Checker

by Pouri · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Shows whether each connection's IP matches your custom CIDR ruleset, and color-codes the toolbar icon. Based on IPvFoo.

Users

0 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#191K

#160K among extensions

Version

2.32+rules.1

updated 24 Jun 2026

Users

monthly, 4 months

Latest, 16 Oct 2026: 10 usersMove the mouse over the chart for any month

Ratings count

monthly, 4 months

Latest, 16 Oct 2026: 6 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CIDR Match — IP Range Checker

CIDR Match shows you, at a glance, whether the IP addresses a web page connects to fall within a CIDR list you define. Paste your IPv4 CIDR ranges once in the options page. Then, for every page you visit, the popup adds a column marking each connection's IP as a match (✔) or not (✖). The toolbar icon is color-coded green/red based on the main page's IP, so you get instant verification without even opening the popup. Use it to: - Verify split-tunnel VPN / policy-based routing is sending a site over the path you expect - Check a service against a firewall allowlist or blocklist - Sanity-check geo/ASN IP allocations - Confirm a request is hitting your CDN's edge ranges and not the origin Privacy first: all matching happens locally in your browser. Nothing is logged, uploaded, or sent anywhere. Your ruleset is stored only on your device. This extension is a derivative work based on the open-source IPvFoo project (Apache-2.0), with custom CIDR rule matching added. It is not affiliated with or endorsed by the upstream author.