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