IP Lookup Tool & Subnet Geolocation Intelligence

Quick Answer

An IP lookup queries authoritative Regional Internet Registry (RIR) databases and BGP route announcement tables to identify the organization, Autonomous System Number (ASN), routing prefix (CIDR), and approximate metropolitan region associated with a given public IP.

RIR records (ARIN, RIPE, APNIC, AFRINIC, LACNIC) determine legal IP allocation blocks.
BGP routing prefixes reveal which network carrier is actively broadcasting the IP path.
Private IP ranges (RFC 1918: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) cannot be looked up globally.

Interactive IP & ASN Query

Enter any public IPv4, IPv6, or domain name to inspect routing metadata:

Regional Internet Registry (RIR) Breakdown

How the global Internet numbers registry is geographically divided and governed.

Global RIR Directory & Authority Table
Registry	Region Covered	Headquarters	WHOIS Database Protocol
ARIN	United States, Canada, Caribbean parts	Chantilly, Virginia, USA	RESTful RDAP & Port 43 WHOIS
RIPE NCC	Europe, Middle East, Central Asia	Amsterdam, Netherlands	RIPE Database & RESTful RDAP
APNIC	Asia-Pacific, East Asia, Oceania	Brisbane, Australia	APNIC Whois & NetRange Search
LACNIC	Latin America and the Caribbean	Montevideo, Uruguay	LACNIC RDAP / Query Service
AFRINIC	African Continent and Indian Ocean	Ebène, Mauritius	AFRINIC Database Directory

IP Lookup Routing & Classification Logic


                 [ Incoming IP Address Query ]
                               |
               +---------------+---------------+
               |                               |
       [ Valid Public IP ]             [ Private / Bogon IP ]
               |                               |
     Query RIR WHOIS Records          RFC 1918 / Loopback Detected
               |                               |
    +----------+----------+           Internal Network Only
    |                     |           (Cannot be routed on WAN)
[ Autonomous System ] [ Geo Subnet ]
    |                     |
BGP AS-Path Mapping   MaxMind / IPinfo
    |                     |
Operator Organization Geographic Coordinates

Frequently Asked Questions

How does an IP lookup reveal my Internet Service Provider and ASN?

Every public IP block is assigned by Regional Internet Registries (such as ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC) to an Autonomous System Number (ASN). When you query an IP, the WHOIS and BGP routing tables disclose which entity announces that prefix to global Tier-1 backbones.

Can an IP lookup pinpoint someone's exact physical GPS coordinates?

No. IP lookups cannot reveal a street address or apartment number. It only maps the IP block to the nearest metropolitan data center, carrier point of presence (POP), or municipal routing hub.

Why does my IP lookup show a different city when I am on mobile data?

Mobile carriers utilize Carrier-Grade NAT (CGNAT) and centralized IP gateways. For example, a phone connected in a suburban area may be routed through an optical trunk to an MSO gateway in a capital city hundreds of miles away.

36 Published Guides

Topic 1: IP Lookup Technical Guides & Standards

Deep-dive engineering tutorials covering address parsing, Regional Internet Registries, BGP prefix mappings, and high-volume client caching strategies.