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IP Address Validator: Guide to IPv4 and IPv6 Validation

7 min read

2026-01-18

How to check an IP address for correctness, differences between IPv4 and IPv6, subnets and masks.

What Is an IP Address?

An IP address is a unique numerical identifier for a device on a computer network. There are two protocol versions.

IPv4

Format: four numbers from 0 to 255, separated by dots. Example: 192.168.1.1

IPv4 Address Classes

ClassRangePurpose
A1.0.0.0 — 126.255.255.255Large networks
B128.0.0.0 — 191.255.255.255Medium networks
C192.0.0.0 — 223.255.255.255Small networks
D224.0.0.0 — 239.255.255.255Multicast
E240.0.0.0 — 255.255.255.255Reserved

Private Ranges

•

10.0.0.0/8

•

172.16.0.0/12

•

192.168.0.0/16

IPv6

Format: eight groups of four hexadecimal digits. Example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

What the Validator Checks

1.

Address format and syntax

2.

Octet value ranges

3.

Address type (public, private, loopback)

4.

CIDR notation correctness

Check IP addresses with the IP Validator.

See also: URL Validator, Checksum Calculator

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