This read-only OCTET STRING holds the IPX node address of the advertising server, noting NetWare 2.x typically uses the real physical MAC address in little-endian order, while NetWare 3.x typically shows 00:00:00:00:00:01. An admin uses this to identify the specific node providing a service, though the value's usefulness for locating a physical device depends heavily on the NetWare version in use. Seeing sipxSapNodeId as 00:00:00:00:00:01 tells the admin they're looking at a NetWare 3.x server's internal IPX address rather than a real hardware MAC address.