Example
[IPv4] 192.168.1.1 …
[INVALID] 999.999.1.1
IP Address Validator
Validate IPv4 and IPv6 addresses instantly in your browser. Free online IP validator that checks format, private/public range, and CIDR — no uploads.
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- IP address(es) to validate — enter a value. A typical IP address(es) to validate would be e.g. 192.168.1.1.
- Review your results — the key output is highlighted, with supporting figures below.
Loading calculator…
Results
Validation report
| Detail | Value |
|---|---|
| IPv4 valid | |
| IPv6 valid | |
| Invalid |
What is this calculator for?
Check whether an IP address is a valid IPv4 or IPv6 address, either on its own or with CIDR notation.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- IP address(es) to validate — enter a value. A typical IP address(es) to validate would be e.g. 192.168.1.1.
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- IP address(es) to validate
- a value · required
About This Calculator
This validator checks each address against strict IPv4 (four 0–255 octets) and IPv6 (RFC 4291, including :: compression and embedded IPv4) rules.
Each line is labeled IPv4, IPv6, or INVALID. CIDR prefixes (e.g. /24) are accepted by ignoring the prefix for the format check. Note: a valid format doesn’t guarantee the address is in use on a network.
Validation runs entirely in your browser.
Worked Examples
Frequently Asked Questions
How is IPv6 with embedded IPv4 handled?
Forms like <code>::ffff:192.168.0.1</code> are recognized: the IPv4 tail is validated and counted within the IPv6 total.
Is 0.0.0.0 valid?
Yes, 0.0.0.0 is a valid IPv4 address format (used as a default route). Loopback (127.0.0.1) and reserved ranges also validate — format checks do not judge usability.