IPv4 Address Validator

Enter any IPv4 string. Get instant valid/invalid plus the exact reason.

IP address

StatusInvalid

ReasonOctet 4 (256) out of range 0-255.

How to read the result

An IPv4 address needs 4 numeric octets 0-255 separated by dots. The validator reports the first failure — wrong octet count, non-numeric text, or out-of-range value.

Example

192.168.1.256 → invalid: octet 4 (256) out of range 0-255

FAQ

Why is 192.168.1.256 invalid?

Each octet must be 0-255. 256 exceeds the 8-bit maximum.

Are leading zeros allowed?

Yes, they parse as decimal here (e.g. 010 = 10).

Is my input sent anywhere?

No. Validation runs entirely in your browser.