IP Address Validator
Runs in your browserValidate one or many IPv4/IPv6 addresses. See whether each is valid, its version, normalized form, and whether it is public, private or reserved. No network calls.
How to read the results
Each row shows the input, whether it is a syntactically valid IP, the detected version, the normalized (canonical) form, and a classification badge. Valid and invalid entries are grouped separately, and you can download either the full result set as CSV.
Examples
2001:0db8:0000:0000:0000:0000:0000:0001normalizes to2001:db8::1.192.168.1.256is invalid — the last octet exceeds 255.127.0.0.1is valid but classified as loopback.
Format only
This validator checks structure and classification. A valid address is not necessarily reachable or assigned.
Runs entirely in your browser using IANA special-use range definitions. Learn about our data sources →
Frequently asked questions
Does this tool connect to the network?
No. It only checks the string format and classification of each address. It never resolves or contacts any host.
How many addresses can I validate at once?
Up to 100 per batch to keep the tool fast and prevent abuse. Split larger lists into multiple runs.
What does “reserved” mean?
The address falls in a special-use range (private, loopback, documentation, multicast, etc.) defined by IANA, so it is not a normal public address.