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IP Range Lookup

One address sits in several blocks at once. See each of them, with its size and where the fact comes from.

216.73.216.68

BlockFirst addressLast addressAddressesSource
Registry allocationUS · allocated · 2024-03-26216.73.216.0/22216.73.216.0216.73.219.2551,024ARIN (delegated-extended)
Announced route (most specific)AS16509216.73.216.0/22216.73.216.0216.73.219.2551,024BGP (APNIC Thyme)
Geolocation rangeNo block of this kind contains the address.

Registries delegate blocks to organisations, networks announce routes to the internet, and geolocation databases group addresses that are used in one place. The three rarely coincide: an allocation can be split into many routes, and a route into many location ranges.

Every public address belongs to several blocks at the same time, defined by different parties for different purposes:

  • the registry allocation — the block a regional internet registry (for Estonia, the RIPE NCC) delegated to an organisation, with its country, status and date;
  • the announced route — the most specific prefix a network announces in BGP for it, and any larger covering routes;
  • the geolocation range — a run of addresses a geolocation database (here DB-IP Lite) estimates to be used in one place;
  • where they apply, a cloud provider range published by AWS, Google Cloud and others, a Spamhaus DROP entry, or an IANA special-purpose range such as 10.0.0.0/8.

Ranges that do not fall on CIDR boundaries are also shown as the list of CIDR blocks that exactly cover them.

Frequently asked questions

Why is the registry block larger than the route?

An organisation often receives one large allocation and announces it in smaller pieces, for example per region or customer, or to steer traffic.

Why is the location range so small?

Geolocation databases split blocks wherever their evidence for the place changes, so a single route can contain many location ranges.

What does it mean when no route is found?

The address is not announced in the global routing table: it is unused, reserved, or only reachable inside a private network.

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