IP Address Lookup - Validate & Analyze IP Addresses Online
Validate IPv4/IPv6, classify ranges, and calculate CIDR subnet details.
What is this IP Address Tool?
This IP address tool validates IPv4 and IPv6 addresses, classifies them into ranges such as public, private, loopback and reserved, and calculates full subnet details from CIDR notation. It runs entirely in your browser and makes no network calls, so your data stays completely private.
Why Use an IP Address Tool?
Networking work is full of subnet math and range checks that are easy to get wrong by hand. This tool gives you instant, accurate answers about any address or CIDR block without sending anything to a server.
- Validate IPv4 and IPv6 addresses
- Detect private, public and reserved ranges
- Calculate network and broadcast addresses
- Find usable host ranges and counts
- Expand and compress IPv6 addresses
- Work fully offline and privately
Common IP Tool Use Cases
Subnet Planning
Plan subnets and host ranges from CIDR blocks.
Input Validation
Confirm an address is valid IPv4 or IPv6.
Firewall Rules
Check ranges when writing ACLs and rules.
Network Config
Derive netmasks and gateways for devices.
Learning
Understand IP classes and subnetting.
Troubleshooting
Diagnose addressing issues on your network.
IP Address Tool for Professionals
This IP address tool is designed for:
- Network engineers
- System administrators
- DevOps engineers
- Security engineers
- Backend developers
- Cloud architects
- IT students
- Support technicians
🎥 Video Guide
❓ FAQs
What does this IP tool do?
It validates IPv4 and IPv6 addresses, classifies them (public, private, loopback, link-local, multicast, reserved), and calculates subnet details from CIDR notation.
Does it look up geographic location?
No. This tool is a fully private, in-browser validator and subnet calculator. It does not send your IP to any external service or database, so it does not return geolocation.
What is the difference between a private and public IP?
Private IPs (like 10.x, 172.16-31.x, 192.168.x) are used inside local networks and are not routable on the internet, while public IPs are globally reachable.
Does it support CIDR notation?
Yes. Enter an address with a prefix like 192.168.1.0/24 to get the network address, broadcast address, usable host range, netmask, and total hosts.
Does it support IPv6?
Yes. It validates IPv6 addresses, expands and compresses them, and identifies special ranges such as loopback (::1) and link-local (fe80::/10).
Is my IP data sent anywhere?
No. Everything is computed locally in your browser with no network requests, so your data stays completely private.
Is this tool free?
Yes. It is completely free with no registration required.
Which browsers support this tool?
It works on Chrome, Firefox, Safari, Edge, and all modern browsers.