We’re currently implementing additional security controls for our hosting platform, and one of the biggest challenges we’re encountering involves customers connecting over mobile networks. As users move between towers or regions they are frequently assigned different IP addresses within very short timeframes, which complicates IP-based allow-listing.
Is there a reliable way to obtain and maintain up-to-date CIDR ranges for major mobile providers such as AT&T, Verizon, and T-Mobile?
For reference, we currently use this from Starlink that provides a public feed of their IP space.
They don’t typically provide them to the public, or small operators. You’d have to be a large provider to get access to a direct feed.