Why IP Geolocation Is Sometimes Wrong
更新日 5 分で読めますIP Checker 編集部
IP geolocation is an estimate, not a GPS lock. Here is why the city, region, or even country can occasionally be inaccurate.
Geolocation databases map IP ranges to locations based on the registration data of internet resources and routing observations. That information is regional, updated periodically, and intentionally coarse for privacy reasons.
Common reasons for inaccuracy
- Mobile networks route through a few large gateways far from the actual device.
- Corporate VPNs make traffic appear from a different city or country.
- Newly allocated IP ranges may not be in the database yet.
- Satellite or fixed-wireless ISPs often map to the operator headquarters.
- CDNs and anycast addresses serve from many locations under one IP.
How to interpret results
Treat IP location as a rough hint, not as proof. For applications that require exact location, use device GPS with explicit user consent.
よくある質問
Why does the tool show a city I have never been to?
Often the answer is the ISP. Geolocation typically reflects the ISP point of presence, not your home.
関連記事
- How IP Geolocation WorksA short technical overview of how IP addresses are mapped to physical locations, and why it is fundamentally probabilistic.
- VPN, Proxy, Mobile and Hosting IPs ExplainedModern IP intelligence classifies addresses into residential, mobile, hosting, proxy and VPN buckets. Here is what each means.
情報源：ip-api ドキュメント、地域インターネットレジストリ（ARIN, RIPE, APNIC, LACNIC, AFRINIC）、および BGP ルーティングデータ。