IPv8 Subnet Calculator
What is IPv8?
IPv8 in this page refers to draft-thain-ipv8-00, published on 14 April 2026. It proposes a managed 64-bit successor to IPv4 with a two-part address structure where the upper 32 bits hold an ASN routing prefix and the lower 32 bits preserve IPv4-style host semantics.
The draft claims IPv4 can be treated as a proper subset when the ASN routing prefix is zero. It also sketches a broader managed-network stack around Zone Servers, DHCP8, DNS8, OAuth8, XLATE8, and companion routing work such as BGP8 and OSPF8.
Address structure
Every IPv8 address is split into r.r.r.r and n.n.n.n. The first half is the 32-bit ASN routing prefix; the second half is the 32-bit host address.
Address classes
| Range | Label | Routability |
|---|---|---|
| 0.0.0.0 | IPv4 Compatible | IPv4 only |
| 100.0.0.0/8 | RINE Peering | Never |
| 127.0.0.0/8 | Internal Zone Prefix | Internal only |
| 127.127.0.0 | Inter-Company Interop DMZ | Private BGP |
| ff.ff.00.00..ff.ff.ef.ff | Cross-ASN Multicast and protocol reservations | Multicast |
| ff.ff.f0.00..ff.ff.fe.ff | Reserved (Future Use) | Never |
| ff.ff.ff.ff | Broadcast | Broadcast |
Notations
The draft requires support for ASN Dot notation alongside eight-octet dotted notation. For example, 0.0.251.240.192.0.2.1 is equivalent to 64496.192.0.2.1 because ASN 64496 equals 0x0000FBF0, which expands to the dotted octets 0.0.251.240.