Is anything uploaded?

No. Parsing happens locally and clears on refresh.

Do you expand the full range?

No. We show the normalized network and prefix.

developer validator

Validate IPv4/IPv6 CIDR blocks and view the normalized network address.

Processing…

Parses IPv4 and IPv6 CIDRs and checks prefix length.

Shows the normalized network address.

Runs fully in your browser; no data leaves the page.

Is anything uploaded?: No. Parsing happens locally and clears on refresh.
Do you expand the full range?: No. We show the normalized network and prefix.

developer

IPv4 Validator

Confirm IPv4 addresses are well-formed before using them in configs or requests.

developer

IP Range Validator

Validate start/end IP ranges (IPv4 or IPv6) and check ordering.

Syntax-only; does not test reachability or overlaps.