Address space
ASN IP Explorer
Every prefix a network originates, shown as structure rather than a flat list: mask distribution, allocation shape, where it lands geographically, and which blocks carry flags worth a second look.
Autonomous system explorer
Look up a network. See how it is actually wired.
asn.dev is an explorer for autonomous systems and the addresses inside them. Search an AS number, an IP, a prefix, a hostname, or an organisation name.
- AS15169 Google
- AS13335 Cloudflare
- 8.8.8.8 An address
- 1.1.1.0/24 A prefix
Context
ASN Details
Who runs the network and what it actually does. Registry and RDAP records, PeeringDB profile, classification, reputation, and a plain language summary for networks that have one.
Topology
Peering
Who a network buys transit from, who it peers with, and who sits behind it, derived from BGP routing tables we parse ourselves rather than from a third party's summary.
Investigation
IP Dossier
One page for a single address: geolocation, the facility its reverse DNS points at, reputation signals, threat intelligence, registration, and how the internet actually routes to it.
Early build
The site is being built in stages. The shell and routing are in place; the data surfaces land next. Nothing here is a public API, and there are no plans for one.