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.
You could ask the NANOG mailing list if any of them track it. I use to that going through unofficial channels like NOGs to get help when getting this kind of odd info.
Completely unaware of NANOG, thank you!