IP Address Lookup

Get geolocation and ISP information for any IP address.

Understanding IP Address Geolocation

IP geolocation is the process of mapping an Internet Protocol address to a physical geographic location. This is made possible through the structured allocation of IP address blocks by five Regional Internet Registries (RIRs): ARIN (North America), RIPE NCC (Europe, Middle East, Central Asia), APNIC (Asia-Pacific), LACNIC (Latin America and Caribbean), and AFRINIC (Africa). Each RIR assigns large address blocks to ISPs and organizations within its region, and these assignments are recorded in publicly accessible WHOIS databases that form the foundation of geolocation mapping.

Geolocation database providers such as MaxMind (GeoIP2), IP2Location, and ipapi aggregate data from RIR records, BGP routing tables, network measurements, and commercial data partnerships to build comprehensive IP-to-location mappings. The accuracy of these databases varies significantly by geographic granularity: country-level accuracy typically exceeds 99%, while city-level accuracy ranges from 50-80% depending on the region and type of IP address. Urban areas with dense ISP infrastructure tend to have higher accuracy than rural regions where IP blocks may be assigned to a regional hub rather than the actual user location.

The internet is currently in a long transition between two addressing standards. IPv4 uses 32-bit addresses formatted as four decimal octets (e.g., 192.168.1.1), providing roughly 4.3 billion unique addresses. With the explosive growth of internet-connected devices, IPv4 addresses have been effectively exhausted, prompting the adoption of IPv6, which uses 128-bit addresses formatted in hexadecimal (e.g., 2001:0db8:85a3::8a2e:0370:7334) and supports approximately 340 undecillion unique addresses. Geolocation databases are continuously updated to cover both IPv4 and IPv6 address spaces.

What IP Lookup Reveals

  • Geographic Location: Country, region/state, city, and approximate latitude/longitude coordinates derived from IP allocation records and geolocation databases.
  • ISP and Organization: The Internet Service Provider or organization that owns the IP address block, revealing the network operator responsible for that address.
  • Autonomous System Number (ASN): The unique identifier assigned to the network's autonomous system, indicating which routing infrastructure manages traffic for that IP range.
  • Timezone: The local timezone associated with the IP's geographic location, useful for displaying region-appropriate timestamps and scheduling.
  • Connection Type: Whether the IP belongs to a residential broadband, mobile carrier, hosting provider, corporate network, or educational institution.
  • Proxy and VPN Detection: Identification of whether the IP address is associated with known VPN services, proxy servers, Tor exit nodes, or data center hosting.

Use Cases for IP Geolocation

  • Content Localization: Automatically serving region-appropriate language, currency, and content to website visitors based on their detected geographic location.
  • Fraud Prevention: Detecting suspicious transactions where the billing address country does not match the IP geolocation, flagging potential stolen credit card usage.
  • Compliance and GDPR: Identifying visitor locations to apply region-specific privacy regulations, cookie consent requirements, and data processing rules mandated by law.
  • Ad Targeting: Delivering geographically relevant advertisements to users, improving click-through rates and return on ad spend for location-dependent campaigns.
  • Analytics and Insights: Understanding where your website traffic originates to inform business decisions about market expansion, server placement, and content strategy.
  • Access Control: Restricting or allowing access to content and services based on geographic location to enforce licensing agreements or regional availability rules.

IP Addresses and Internet Infrastructure

IP addressing follows a hierarchical structure defined by CIDR (Classless Inter-Domain Routing) notation, which replaced the older classful addressing system. CIDR notation appends a prefix length to an IP address (e.g., 192.168.1.0/24), indicating how many leading bits define the network portion. This allows flexible subnetting, where large address blocks are divided into smaller networks of various sizes. ISPs receive address blocks from RIRs and further subnet them for assignment to individual customers and services.

Autonomous System Numbers (ASNs) are unique identifiers assigned to networks that operate under a single routing policy. Large ISPs, cloud providers, and enterprises each operate one or more autonomous systems. These ASNs are essential to BGP (Border Gateway Protocol), the routing protocol that enables autonomous systems to exchange reachability information and determine the best paths for data to traverse the global internet. When you look up an IP address, the associated ASN tells you which network operator is responsible for routing traffic to and from that address.

The exhaustion of IPv4 addresses has been a driving force behind several infrastructure adaptations. NAT (Network Address Translation) allows multiple devices on a private network to share a single public IP address, which is why many users in the same neighborhood may appear to have identical public IPs when viewed from external servers. Carrier-Grade NAT (CGNAT) extends this further, with ISPs sharing single public addresses across hundreds of customers. This complicates IP geolocation because a single IP may represent users in different locations. The gradual adoption of IPv6 aims to eliminate NAT dependency by providing enough unique addresses for every connected device on the planet.

Regional Internet Registries

Registry Region Headquarters IP Ranges Managed
ARIN North America, parts of Caribbean Chantilly, Virginia, USA ~120 million IPv4 addresses
RIPE NCC Europe, Middle East, Central Asia Amsterdam, Netherlands ~820 million IPv4 addresses
APNIC Asia-Pacific Brisbane, Australia ~860 million IPv4 addresses
LACNIC Latin America, Caribbean Montevideo, Uruguay ~190 million IPv4 addresses
AFRINIC Africa Ebene, Mauritius ~115 million IPv4 addresses

Frequently Asked Questions

How accurate is IP geolocation?

IP geolocation accuracy varies by granularity level. Country-level identification is typically 95-99% accurate. City-level accuracy ranges from 50-80% depending on the region, ISP, and database provider. Rural areas and mobile networks tend to show lower accuracy because IP blocks may be assigned to regional hubs rather than the exact user location. VPN and proxy usage further reduces accuracy since the detected location reflects the proxy server, not the user.

Can someone find my exact address from my IP?

No. IP geolocation provides an approximate location, typically accurate to the city or neighborhood level. Your exact street address is not encoded in your IP address. Only your Internet Service Provider knows the precise mapping between your IP and physical address, and they are legally required to protect this information. Law enforcement can obtain this data through proper legal channels such as court orders, but it is not publicly accessible through IP lookup tools.

What is an ASN?

An Autonomous System Number (ASN) is a unique identifier assigned to a network or collection of networks that operates under a unified routing policy. ISPs, cloud providers, large enterprises, and universities each typically have their own ASN. The ASN is used in BGP (Border Gateway Protocol) to exchange routing information between networks on the internet. For example, Google operates AS15169 and Cloudflare operates AS13335. Knowing an IP's ASN tells you which network infrastructure manages that address.

Why does my IP show a different city?

Several factors cause IP geolocation to display an incorrect city. Your ISP may route your traffic through a regional hub in a different city. If you use a VPN, the displayed location reflects the VPN server's position. Mobile networks frequently assign IP addresses from pools registered in their headquarters city rather than your actual location. Additionally, geolocation databases may have outdated records for recently reassigned IP blocks. This discrepancy does not indicate a security issue.