Life & fun · February 26, 2017
A Simple Website for Checking Cloudbleed from Browser's History
A Simple Website for Checking Cloudbleed from Browser's History launched on February 26, 2017 with 132 votes, #274 of 3,156 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
This tool checks whether users have visited websites that were potentially affected by Cloudbleed, a 2017 security vulnerability. It displays 1,259 URLs known to use Cloudflare and uses browser history to highlight any that a user has previously visited. The tool is intended for people wanting to understand their exposure to the incident. It clarifies that being highlighted does not confirm compromise or that users were affected, as some vulnerable sites may not be listed and highlighting does not guarantee a site was breached.
written from the facts on this page · September 2026
From the sources
The heart consists of 1,259 URLs from the lists . The :visited CSS pseudo-class is used here to highlight the sites visited before. Please read the DISCLAIMER below. The list of domains are from the README of sites-using-cloudflare Github repository . Please visit it for detailed infomation. Just because a site is highlighted above on the heart does not mean that it is compromised or you are affected by the cloudbleed. Sites may be compromised that do not appear and sites you have visited may not be highlight above either. The full list of urls composed the heart can be found here . This list contains all domains that use Cloudflare DNS, not just the Cloudflare proxy (the affected service…from cloudbleed.github.io
Does a similar job
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Check your Safari history for sites using Cloudflare2017 · gist.github.com · ▲54Check your browsing history for sites using Cloudflare - chrome.py
Its simply tool for check is you site POSSIBLE affected to CloudFlare data leaks2017 · ▲6cloudflare, leaks, hack
Cloudbleed Indicator for Chrome2017 · chromewebstore.google.com · ▲88It does not fix the issue, it recognizes it.
I made a down detector for down detectorNov 2025 · downdetectorsdowndetector.com · ▲591After down detector went down with the rest of the internet during the Cloudflare outage today I decided to build a robust, independent tool which checks if down detector is down. Enjoy!!
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