Why GeoIP Thinks You Work in Ashburn, Virginia
GeoIP pins anycast and cloud prefixes to famous datacenter towns. Use origin ASN, looking-glass next hops, and live prefix data instead of a city label.
THE BGPLOOKUP JOURNAL
Category: <span>Geolocation</span>
CGNAT makes your IP lookup look wrong
A million households, one origin, one angry ticket. Carrier-grade NAT is why the address is not a person.
Anycast breaks IP geolocation — and that is fine
One address, many cities. If your geo pin is sure and the prefix is anycast, the pin is the problem.
Residential, cloud, VPN: reading IP categories like a grown-up
The category on a prefix is the most useful column on a geo lookup — if you remember it is a label, not a confession.
IP geolocation is a guess — treat it like one
Every geolocation database is someone’s best effort at mapping a prefix to a place. Here is when I trust it, when I do not, and what “category” is actually good for.