IP Geolocation Guides

Learn how to set up geo redirects that route website visitors to localized pages based on their country. Includes JavaScript and PHP code, SEO guidance, and best practices.

A developer guide to blocking visitors by country, with working code in JavaScript, Python, and PHP, honest trade-offs between CDN, WAF, DNS, and application-level enforcement, and a real treatment of VPN and proxy bypass.

IP addresses identify every device on the internet, but most explanations barely scratch the surface. This guide covers how they work, IPv4 vs IPv6, address types, assignment chains, what your IP reveals through geolocation, and how to stay protected.

Bogons and martians overlap but aren't the same. A clear, RFC-grounded comparison that breaks down traditional bogons, fullbogons, and IPv6 bogons, with classification examples, filtering rules for routers, firewalls, and Linux, and notes on how geolocation APIs handle reserved IPs.

A geofeed is how network operators publish the real locations of their IP ranges so geolocation providers can stop guessing. This guide covers the RFC 8805 format, RFC 9632 discovery, per-RIR submission, and how to publish to IP geolocation providers.

An ASN (Autonomous System Number) is a unique identifier assigned to a network for internet routing via BGP. This guide explains ASN types, real-world examples, and how to look up ASN data for any IP address.

IP geolocation maps IP addresses to geographic locations like country, city, and timezone. This guide covers how it works, how accurate it really is, and what developers and businesses use it for in 2026.

Bogon IP addresses are unallocated or reserved IPs that should never appear on the public internet. This guide covers the full IPv4 and IPv6 bogon range lists, security risks, and practical filtering methods.

Learn when to use an IP geolocation API vs a downloadable database, and whether MMDB or CSV fits your workflow. A practical guide based on real setup decisions.