# Global IP Lookup

> Global IP Lookup is a free browser-based tool for checking a connection's public IPv4 and IPv6 addresses, approximate network location, internet provider and connection details. IP-based locations are estimates and do not reveal a precise address.

## Primary tools

- [What is my IP address?](https://globaliplookup.com/): Check the public IPv4 and IPv6 addresses used by the current connection.
- [IP address lookup](https://globaliplookup.com/ip-address-lookup): Inspect a public IPv4 or IPv6 address for approximate location, ISP, organization and ASN.
- [Subnet calculator](https://globaliplookup.com/subnet-calculator): Calculate an IPv4 network, broadcast address, host range and capacity from a CIDR prefix.

## Developer resources

- [Public IP API and badge](https://globaliplookup.com/public-ip-api): Documentation for the no-key JSON endpoint and SVG badge.
- [OpenAPI description](https://globaliplookup.com/openapi.json): OpenAPI 3.1 description of the public endpoints.
- [MCP support and connection](https://globaliplookup.com/support): Read-only tools for looking up a supplied public IP and calculating an IPv4 subnet. The MCP endpoint cannot discover the ChatGPT user's own public IP.
- [CIDR subnet cheat sheet](https://globaliplookup.com/cidr-subnet-cheat-sheet): Common IPv4 prefixes, masks and address counts.

## Explanations and troubleshooting

- [What is an IP address?](https://globaliplookup.com/what-is-an-ip-address)
- [IPv4 vs IPv6](https://globaliplookup.com/ipv4-vs-ipv6)
- [Public vs private IP addresses](https://globaliplookup.com/public-vs-private-ip)
- [Does a VPN change your IP?](https://globaliplookup.com/does-a-vpn-change-your-ip)
- [How accurate is IP location?](https://globaliplookup.com/how-accurate-is-ip-location)
- [Why is my IP location wrong?](https://globaliplookup.com/why-is-my-ip-location-wrong)
- [Why is IPv6 unavailable?](https://globaliplookup.com/why-is-ipv6-unavailable)
- [What can someone do with my IP?](https://globaliplookup.com/what-can-someone-do-with-my-ip)
- [Find an IP address on common devices](https://globaliplookup.com/find-ip-address-on-devices)

## Trust and policies

- [About Global IP Lookup](https://globaliplookup.com/about): Data sources, editorial approach and accuracy limits.
- [Privacy](https://globaliplookup.com/privacy): Request handling and privacy information.
- [Terms of use](https://globaliplookup.com/terms): Accuracy, acceptable-use and availability terms.
- [Support](https://globaliplookup.com/support): Help, security reports and the public MCP connection address.