How works geolocation, and how can you use it for your website.
As an overview, geolocation is only possible because blocks of IP addresses are assigned to countries in a segmented way. The distribution of those blocks is referenced in publicly accessible databases. The geolocation process is quite simple in appearance, as it's only a matter of comparing your visitors' IP addresses with those segments to determine which country your visitor is located in.
Developing a geolocalization service by yourself could be tempting. Still, it would require significant resources. You will first need to obtain the IP-to-countries allocation databases from all the different responsible organizations and set up a high-performance service to query those databases in real-time.
An economical solution in the long term is to use an external service, called an API, which can provide real-time response and precise geolocation of an IP address. The IP Intelligence API offers detailed IP data, including geolocation, and is an excellent choice for implementing geolocation functionality. APIs can be queried by a simple HTTP request and responds in JSON format. You will get the desired information in a few milliseconds without the need for an advanced implementation.
How visitors can beat geolocation and bypass geo-blocking.
Most Internet users know that there are ways to circumvent geolocation systems, and therefore bypass geo-blocking, by accessing the Internet through a free proxy or a VPN service. Indeed a VPN allows a user to appear to web servers as if he were connected from a different geographical location. If you need to detect whether users are utilizing proxies to bypass restrictions, you can use the Proxy Detector, which identifies proxy connections effectively.
Depending on your geolocation policy, you may want to implement a mechanism to detect if your visitor modified his apparent geographical location using a VPN service so that you can act accordingly with such users. Once again, you could develop a service by yourself by getting a list of all publicly known IP addresses of VPN services and comparing your visitor's IP address to this list at run-time. But the same problem arises since the list of VPN IP addresses is huge and is constantly evolving. Hence it would require significant resources in terms of development and infrastructure.
How to easily implement geolocation and avoid users trying to bypass geo-blocking.
The most economical solution is to use an API that specialized in providing information about an IP address, specifically its physical location, and can detect if it belongs to a network of VPNs.
Abstract provides such service, which has the advantages to be free, extremely fast, and that you can set-up in a matter of minutes. It allows you to detect in which geographical area your visitor is located and tell you if he is currently connected to the Internet through a VPN. To set up an effective geo-blocking system, it is advisable to use a reliable API such as the one provided by Abstract.
Frequently Asked Questions
What is geographic restriction and why would a website use it?
Geographic restriction (geo-blocking) is technology that limits or denies website access based on a visitor's physical location, determined by their IP address. Websites use it for licensing compliance, regional pricing policies, legal requirements like GDPR, or to meet content distribution agreements.
How does a website detect a visitor's country from their IP address?
When a user makes a request, the server reads their IP address and queries an IP-to-country database or a third-party geolocation API to map that address to a geographic location. Services like Abstract's IP Geolocation API return country, region, and city data in milliseconds via a simple HTTP request.
Should I build my own IP geolocation system or use an API?
Using a third-party API is strongly recommended over building your own. Maintaining an accurate, up-to-date IP database requires significant ongoing resources because IP allocations change frequently. An API handles all database maintenance and can return location data in a few milliseconds with minimal implementation effort.
What happens if a user bypasses geo-restrictions with a VPN or proxy?
Most users know that VPNs and proxies can circumvent IP-based geo-blocking. To address this, you can use a VPN/proxy detection API alongside geolocation: services like Abstract's IP Intelligence API flag whether a request is coming through a proxy or VPN, letting you enforce restrictions more reliably.
What are the two main approaches to implementing geographic restrictions?
The two main approaches are network-level blocking, where IP packets are filtered before reaching the application, and application-level blocking, where the server or application code checks location after receiving the request and denies access accordingly. Application-level blocking with a geolocation API is the most common and flexible method for web developers.
Can I use a CDN to enforce geo-restrictions instead of custom code?
Yes: CDNs like Amazon CloudFront have built-in geo-restriction controls that can block or allow traffic by country without any application code changes. This is useful for broad, country-level blocking, but combining it with an API gives you finer-grained control and the ability to detect VPNs and proxies.
