IS-IS NET Generator
Assemble an IS-IS NET (N-selector 0x00) from an area address and a 6-octet system ID, entered directly or derived from an IPv4 address.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Generated NET
| NET | — |
|---|---|
| Continuous hex | — |
| Total length (octets) | — |
| Area address | — |
| Area length (octets) | — |
| System ID | — |
| System ID from IPv4 (convention) | — |
| N-selector (NSEL) | — |
How it works
Enter the area address in hex (49.0001, or just 49, or a longer value up to 13 octets) and the 6-octet system ID. The system ID can be typed directly (1921.6800.1002) or derived from an IPv4 address with the common convention: pad each octet to three decimal digits and read the result as three 16-bit groups (192.168.1.2 → 1921.6800.1002). This tool always produces a NET: the N-selector is fixed at 0x00 by definition (an NSAP with any other selector is not a NET, and building one is out of scope here — use the parser to inspect an arbitrary NSAP). The tool checks that the total is 8–20 octets and prints the NET in the Cisco grouping — other platforms group the hex differently but the value is the same. IPv4-derived system IDs are only a convention, and the loopback address you base one on should be unique and stable across the IS-IS domain. Review the generated NET against the device configuration.