Understanding how a service might infer your location helps explain unexpected regional messaging — worth being precise about which signals are actually publicly known to be common industry practice, rather than speculating about specifics that aren't disclosed.
IP-based geolocation: the common, publicly understood signal
Like most online services, connection-level location inference commonly relies at least partly on IP-based geolocation — the same general mechanism covered in How IP Geolocation Works, subject to the same country-level reliability and city-level uncertainty that applies to any IP-based location inference generally.
Account-supplied context
Information you've provided directly — a billing address, account registration details — is a plausible and common additional signal that services generally use to inform location-related decisions, separate from real-time network-based inference.
What this guide won't claim
Beyond these generally understood, industry-common mechanisms, this guide makes no claim about specific undisclosed methods Anthropic may or may not use internally — that level of detail isn't publicly documented, and presenting speculation as fact wouldn't be accurate or useful.
What this means practically
If your account's billing region and your current network's apparent location differ (for instance, while traveling, or behind a VPN), that mismatch is a plausible, common source of unexpected regional behavior worth being aware of — check your current network's apparent signals with NetRiskScan's Claude Access Checker as one relevant data point.
FAQ
Can GPS or device location affect this?
For a web-based service accessed through a browser, device GPS generally isn't a signal in play unless a specific feature explicitly requests and receives that permission — IP-based and account-based signals are the more commonly relevant ones for general access.