IPv6 geolocation follows the same basic principle as IPv4 geolocation — inferring location from how address blocks are registered and allocated — but the newer, less mature ecosystem around IPv6 databases means the practical accuracy story is somewhat different.
Prefix-based allocation
Similar to IPv4's country-specific block allocations, IPv6 address blocks are allocated by regional registries to ISPs and organizations, generally along country and regional lines — providing the same basic country-level reliability that IPv4 geolocation typically achieves.
Why IPv6 databases often lag behind
Because IPv6 adoption has grown more gradually and more recently than IPv4's decades-long history, some geolocation providers' IPv6 databases are less mature and less frequently updated than their long-established IPv4 counterparts — meaning stale or missing data is comparatively more common for IPv6 addresses.
ISP allocation patterns matter more
Because IPv6's vast address space means ISPs allocate very large blocks at once, an IPv6 prefix's registered location can sometimes represent a broad regional allocation rather than a granular per-city assignment — potentially widening the gap between registered location and actual user location compared to more granular IPv4 allocations in some cases.
Mobile routing adds another layer
As with IPv4, mobile carrier IPv6 allocation can route through regional gateways that don't precisely match a device's actual position — the same carrier-grade-NAT-adjacent dynamic covered in Mobile IP Addresses and Carrier-Grade NAT, though IPv6's larger address space means true NAT is less necessary even as regional routing quirks persist.
FAQ
Is IPv6 geolocation always less accurate than IPv4?
Not universally — it depends heavily on the specific provider's database maturity for the region in question, but city-level uncertainty is a reasonable general expectation for either protocol.