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Comment by jlgaddis | Hacker News Reader

Anyone wrote a script yet that checks the top 1M (or so) web sites to find out which use Cloudflare? It would help with knowing what secrets I need to change (as an end user -- I'm not a Cloudflare customer, thank $deity).

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Yup, running it now. Results are being posted as fast as I can here:

https://github.com/pirate/sites-using-cloudflare

Looks cool, you have a lot of duplicates, though.

   $ cat sorted_unique_cf.txt | wc -l
    7385121

   $ cat sorted_unique_cf.txt | uniq |wc -l
    4287625

Apologies, fixing that now! I ran uniq before but piped it into the wrong file and ended up uploading the non unique version.

Fixed: https://github.com/pirate/sites-using-cloudflare/raw/master/...

Popular companies that use CloudFlare can be found here: https://stackshare.io/cloudflare/in-stacks

Not as epic, but I wrote a small node app that checks a list of URLs (made it to check my 1password sites, but it can be used on stuff in general). Not very sophisticated, just checks DNS and setCookie strings...

https://github.com/weltan/cloudbleed-1password

You don't even have to write a script, all that info is already out there.

I know I could find out by checking DNS, etc., but I'd rather not have to do that for every web site I use... and I'm guessing Cloudflare doesn't publish a list of every domain name that they serve.

Maybe you can go backwards and see which websites resolve with these IPs:

https://www.cloudflare.com/ips/

Good idea, I'll try that next and add the results here: https://github.com/pirate/sites-using-cloudflare

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