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I am looking for an authoritative list of IP space Facebook uses. I need this to support a locked down developer environment that has very tight restrictions on outbound connectivity.
Today I found api and graph.facebook.com started resolving to 69.171.224.0/19 which was not previously in my filters. I've updated it but I'd like to know what other IP space I'm missing allow rules for.
Here's what I have currently. Any additional IP blocks you can list out would be great. Thanks everyone.
69.63.176.0/20 69.171.224.0/19 66.220.144.0/20 204.15.20.0/22 
660
The reason Facebook sometimes blocks accounts using VPN is because it also keep lists of IP address ranges that are for know for VPN usage. Facebook checks your IP address every time you log in. It's one of the ways they confirm that you really are who you say you are.
According to Reserved IP addresses there are 588,514,304 reserved addresses and since there are 4,294,967,296 (2^32) IPv4 addressess in total, there are 3,706,452,992 public addresses.
The list from 2020-05-23 is:
31.13.24.0/21 31.13.64.0/18 45.64.40.0/22 66.220.144.0/20 69.63.176.0/20 69.171.224.0/19 74.119.76.0/22 102.132.96.0/20 103.4.96.0/22 129.134.0.0/16 147.75.208.0/20 157.240.0.0/16 173.252.64.0/18 179.60.192.0/22 185.60.216.0/22 185.89.216.0/22 199.201.64.0/22 204.15.20.0/22 The method to fetch this list is already documented on Facebook's Developer site, you can make a whois call to see all IPs assigned to Facebook:
whois -h whois.radb.net -- '-i origin AS32934' | grep ^route If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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