Subnet Calculator

Paste an address in any form — 192.168.1.0/24, 2001:db8::/32, or the new r.r.r.r.n.n.n.n IPv8 notation from draft-thain-ipv8-00 — and the calculator detects the family and shows network details, usable host range, and the likely gateway.

—

Prefix

Try:

IPv8 detected. Per draft-thain-ipv8-00 (published 14 April 2026), addresses are 64 bits wide written as r.r.r.r.n.n.n.n — a 32-bit ASN routing prefix followed by a 32-bit host address with IPv4 semantics. IPv4 is a proper subset: 0.0.0.0.n.n.n.n is an IPv4 address.

Overview

Host Range

Mask & Representation