IS-IS NET Parser
Split an IS-IS NET / NSAP into its AFI, area address, 6-octet system ID, and N-selector, with length and NET validity checks.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Fields
| Canonical form | — |
|---|---|
| Total length (octets) | — |
| AFI | — |
| AFI meaning | — |
| Area address | — |
| Area length (octets) | — |
| System ID (6 octets) | — |
| N-selector (NSEL) | — |
| Valid NET (NSEL = 00) | — |
| System ID as IPv4 (convention) | — |
How it works
A Network Entity Title (NET) is an OSI NSAP address whose last octet — the N-selector — is 0x00 (ISO/IEC 10589, RFC 1195). Paste a NET or NSAP in hex with any grouping (49.0001.1921.6800.1002.00, 49000119216800100200, spaces, dashes) and this splits it into the area address (1–13 octets, starting with the AFI), the 6-octet system ID (RFC 1195 fixes it at 6 octets for IP routing), and the N-selector. A total length outside 8–20 octets, an odd number of hex digits, or non-hex characters are reported rather than repaired. The AFI is shown exactly as written (49 = private, 47 = ISO ICD, 39 = ISO DCC); it is not re-decoded as a decimal authority code. When the system ID's 12 digits are all decimal and form four in-range octets, the IPv4 address behind the common padding convention is shown — as a convention only. A non-zero selector means the value is an NSAP, not a NET, and is flagged.