What Is an IP Lookup?
An IP lookup (also called IP geolocation or IP address lookup) is the process of finding information associated with a specific IP address. When you type an IP address into a lookup tool, the system queries geolocation databases and network registries to return details such as the geographic location, Internet Service Provider (ISP), Autonomous System Number (ASN), and connection type.
What Information Does an IP Lookup Return?
A comprehensive IP lookup returns the following data points:
- Country, Region & City: The geographic location associated with the IP address
- Latitude & Longitude: Approximate GPS coordinates (not exact home location)
- ISP: The internet service provider that owns the IP address block
- Organization: The company or entity registered to use the IP
- ASN (Autonomous System Number): A unique identifier for networks on the internet
- Timezone: The timezone associated with the IP's geographic location
- Postal Code: The ZIP or postal code area (where available)
- VPN / Proxy / Hosting Detection: Whether the IP appears to belong to a VPN service, proxy server, or data center
How to Look Up an IP Address
Using this tool is simple:
- Enter any valid IPv4 or IPv6 address in the search box above
- Click the "Lookup" button
- Results will appear within seconds, showing location, ISP, and network details
- Optionally download the full result set as a JSON file for further analysis
Use Cases for IP Address Lookup
IP lookups are used by a wide range of professionals and applications:
- Cybersecurity analysts — Investigate suspicious incoming connections or verify the origin of attacks
- Webmasters & developers — Debug server access issues, identify bots, or analyze traffic
- Network administrators — Trace packets and diagnose routing issues
- Content & media companies — Enforce geographic content licensing restrictions
- E-commerce platforms — Fraud detection and prevention by verifying buyer location
- Legal & compliance teams — Geoblock certain jurisdictions per regulatory requirements
Understanding ASN (Autonomous System Numbers)
An Autonomous System Number (ASN) is a unique identifier assigned to a collection of IP networks and routers under the control of a single organization or entity that presents a common routing policy to the internet. Major ISPs, universities, corporations, and cloud providers each have one or more ASNs. For example, Google's primary ASN is AS15169, while Cloudflare uses AS13335.
When you look up an IP address, the ASN helps identify the organization that controls the IP block — useful for determining whether an IP belongs to a cloud hosting provider, a VPN service, or a residential ISP.
VPN & Proxy Detection — How It Works
Many IP geolocation APIs maintain curated lists of known VPN providers, proxy servers, and data centers. When a lookup is performed on an IP from these lists, a flag is returned indicating the connection type. This is widely used for fraud prevention and access control. However, detection is not 100% reliable — newer VPN servers may not yet appear in these databases, while legitimate residential IPs may occasionally be misclassified.