That’s another private range that was added for Carrier-Grade NAT that is part of RFC6598. It’s a non-Internet routable 100.64.0.0/10 subnet for things like WISPs, Satellite providers like Starlink, Tailscale, and cellular providers that are strapped for IPv4 addresses.
Ok one last question: did tailscale have to buy the 100.100.100.x range, or is that available to anyone and they are just the only user i know?
That’s another private range that was added for Carrier-Grade NAT that is part of RFC6598. It’s a non-Internet routable 100.64.0.0/10 subnet for things like WISPs, Satellite providers like Starlink, Tailscale, and cellular providers that are strapped for IPv4 addresses.