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I believe Global Net Access LLC owns the subnet of IP addresses that Linode use.

FWIW Linode has 5 datacenters, and at least 5 address ranges, so there may be more undercounting going on for them.

I updated my script to take that into account. The page has has been updated to reflect that change.

Linode's Fremont DC is owned by Hurricane Electric which is also being mis-represented.

Heroku IPs are 75.101.163.44, 75.101.145.87, and 174.129.212.2, if you want to update the script to make the distinction from raw Amazon EC2.

Yeah, I was confused by the lack of people using Heroku.