IP address lookup
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What this answers
Which block of addresses a given IP belongs to, and who that block is registered to - the registry data behind an address, not a live trace of who is currently using it or where a specific device sits.
The five regional registries
IP address space is delegated by IANA to five Regional Internet Registries - ARIN (North America), RIPE NCC (Europe/Middle East/Central Asia), APNIC (Asia-Pacific), LACNIC (Latin America/Caribbean) and AFRINIC (Africa) - each authoritative for its own region's allocations. The RDAP bootstrap redirector used here finds the right one automatically; which one answered is shown as the source.
Allocation is not geolocation
The organization and country shown are about who the address BLOCK is assigned to, which is often a large ISP, cloud provider or hosting company - not the physical location of whatever device is currently using one address within that block. A block registered to a US-based cloud provider can still serve traffic from anywhere that provider operates infrastructure.
Related tools
See reverse DNS lookup for the PTR hostname of a specific address, and ASN lookup for the autonomous system routing it.
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