Topic cluster

IP Tools

Use these tools when you need to identify a public address, compare IPv4 and IPv6 behavior, inspect approximate network ownership, or check whether an IP address publishes a PTR hostname.

Tools

Focused tools for this topic

Check your public IP address, inspect IP metadata, test IPv6 connectivity and find reverse DNS records from one focused IP tools hub.

What Is My IP & IP Lookup

Check your public IPv4 or IPv6 address, or look up approximate network, ISP and location details for an IP address.

IPv6 Connectivity Test

Test whether your current browser and internet connection can reach IPv6-only services and compare the detected public IPv4 and IPv6 addresses.

Reverse DNS Lookup

Find the optional PTR hostname published for an IPv4 or IPv6 address using encrypted public DNS.

RDAP / WHOIS Lookup

Query structured registration data for a domain, IP address or autonomous system number through authoritative RDAP registry routes.

Subnet / CIDR Calculator

Calculate an IPv4 subnet mask, network, broadcast address, host range and address count locally in your browser.

Overview

What to know before using these checks

How IP address checks fit together

An IP address identifies a network endpoint. A public IP lookup answers what the outside internet sees, while reverse DNS and RDAP add context about naming and registration.

IPv6 testing is separate because many networks are dual-stack: IPv4 may work while IPv6 is missing, filtered, or routed through a different provider.

Related guides

Learn the concepts behind the tools

What Is an IP Address?

Learn what an IP address is, how public and private addresses differ, and how IP lookup tools add useful network context.

IPv4 vs IPv6

Compare IPv4 and IPv6 address formats, capacity, routing behavior and practical troubleshooting differences.

Public vs Private IP Address

Understand the difference between public internet addresses and private local network addresses.

Why Does My IP Address Change?

Learn why public IP addresses change across ISPs, VPNs, mobile networks and cloud environments.

FAQ

Common questions

Can an IP lookup show an exact street address?

No. Public IP geolocation is approximate and often points to an ISP, VPN endpoint, office gateway or regional routing location.

Why does reverse DNS sometimes return nothing?

PTR records are optional. Many residential, cloud and temporary addresses do not publish a meaningful reverse DNS hostname.