OSPF Area ID Converter
Convert an OSPF area ID between its 32-bit decimal value and the dotted-decimal a.b.c.d form, with hex and binary views.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Representations
| Decimal (32-bit) | — |
|---|---|
| Dotted-decimal | — |
| Hexadecimal | — |
| Binary | — |
| Detected input format | — |
| Backbone area (area 0) | — |
How it works
RFC 2328 identifies each OSPF area by a 32-bit number. Cisco IOS, Junos, and others let you write it either as a plain integer (area 10) or in dotted-decimal notation that looks like an IPv4 address (area 0.0.0.10); the two are the same value. Paste a decimal integer (0–4294967295), a hex value (0x0000000A), or a dotted a.b.c.d string and this shows all four representations. Area 0 / 0.0.0.0 is the backbone area and is flagged as such. The dotted form is only a notation for the 32-bit number — it is not an IP address, is not routed, and does not need to match any prefix in the area.