IP Tools
Lookup, validate and convert IP addresses.
IP address tools
Valid IPv4 address— private/internal range
Validate IP addresses and calculate subnets online
IP Tools checks whether an address is valid IPv4 or IPv6, flags private/internal ranges, and calculates full subnet details from CIDR notation.
Why use this tool
IPv4 & IPv6 validation
Instantly checks whether an address is correctly formatted, and identifies which IP version it is.
Private range detection
Flags addresses in the common private/internal ranges (10.x, 172.16-31.x, 192.168.x, and loopback).
Full subnet breakdown
Enter a CIDR block and get the network address, broadcast address, subnet mask, usable host range, and host count.
No lookups, fully private
This tool only validates and calculates — it doesn't perform any network requests or expose your own IP.
How it works
- 1Choose Validate IP or Subnet calculator.
- 2Enter an IP address, or a CIDR block like 192.168.1.0/24.
- 3Read the validation result or subnet breakdown.
Frequently asked questions
Good to know
- Private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, and 127.0.0.0/8 (loopback).
- CIDR notation (e.g. /24) tells you how many bits are the network prefix.
- Runs fully in your browser — nothing is uploaded.