How Does IP Geolocation Work?

What is IP geolocation?

IP geolocation is the process of estimating the real-world geographic location of a device based solely on its IP address. It is used everywhere — from content delivery networks routing your traffic to the nearest server, to streaming services enforcing regional licensing, to fraud detection systems flagging suspicious login locations.

iptool displays geolocation data alongside your IP address, including country, region, city, postal code, timezone, and approximate coordinates.

How geolocation databases are built

There is no single authoritative source that maps every IP address to a location. Instead, geolocation providers compile their databases from multiple data sources:

• Regional Internet Registry (RIR) data — when an ISP or organization is allocated a block of IP addresses, they register that block with a Regional Internet Registry (such as ARIN, RIPE, or APNIC). The registration often includes a country or organization address, giving a rough starting point.
• BGP routing tables — Border Gateway Protocol announcements reveal which networks own which IP ranges and where those networks are interconnected, providing clues about geographic distribution.
• Active probing and latency measurements — geolocation providers send network packets to IP ranges and measure response times from known locations. Shorter round-trip times suggest geographic proximity.
• User-submitted corrections — some providers allow organizations or users to submit corrections when their geolocation is wrong, gradually improving accuracy over time.
• Commercial agreements with ISPs — some geolocation providers pay ISPs directly for accurate subscriber location data, though this raises privacy concerns and is not universal.

Why geolocation is often inaccurate

IP geolocation is an inference, not a direct measurement. Several factors commonly cause it to be wrong:

• Centralized ISP infrastructure — a large ISP may route all traffic from a wide region through a single point of presence in a major city. Every customer in that region may appear to be located in that city, even if they live hundreds of kilometres away.
• VPNs and proxies — traffic routed through a VPN will appear to originate from the VPN server's location, not the user's actual location.
• Mobile carrier NAT — mobile networks often aggregate traffic from vast geographic areas before it hits the internet, making city-level or even country-level precision unreliable.
• Satellite internet — services like Starlink route user traffic through ground stations that may be thousands of kilometres from the user, often placing them in a completely different country.
• Stale database entries — IP address blocks are bought, sold, and reallocated regularly. Geolocation databases can lag behind, associating an address with its previous owner's location.

Country-level accuracy is generally high (95%+). City-level accuracy is much lower — often 50–80% depending on the provider and region, and can be dramatically wrong in the cases above.

How iptool uses geolocation

iptool uses geolocation data provided by AWS CloudFront, which enriches incoming requests with geographic information derived from its own IP intelligence. This data is passed to the iptool API and returned alongside your IP address.

The geolocation shown is approximate and is displayed with an explicit accuracy disclaimer. It is intended to give you a general sense of what your IP reveals — not a precise location. If the result looks wrong, the most likely explanation is one of the factors described above.