Even companies which not only should know better, but are actually paid to handle things like this get it hilariously wrong. The company I work for is a client

Even companies which not only should know better, but are actually paid to handle things like this get it hilariously wrong. The company I work for is a client of a big-ass CDN you've heard of (not the one whose ceo hangs around these parts). Yet, they somehow think it's fine to notify me of "new connections from an unusual IP" when I connect from the same /64 block of ipv6.