Because it is not IP based.
NetBEUI is the only listed protocol that is not routable; the rest are.
when is NetBIOS routable
Windows XP does not automatically install NetBEUI, as Microsoft considers it a legacy protocol.
NetBios Extended User Interface
Windows XP
IPX/SPX : Routable // TCP/IP : Routable // NetBEUI : Not Routable
NetBEUI is the only listed protocol that is not routable; the rest are.
It's not routable network + Guide to networks pg196
A routable protocol contains a network address as well as a device address. Non-routable protocol, on the other hand, regulate the transfer of data and always makes use of interior routing system to transmit data.
when is NetBIOS routable
AppleTalk and NetBEUI are both networking protocols used in local area networks (LANs). AppleTalk, developed by Apple Inc., was primarily used for networking Macintosh computers, allowing them to communicate and share resources. NetBEUI (NetBIOS Extended User Interface), created by IBM and Microsoft, is a simple, non-routable protocol designed for small networks, facilitating communication between Windows-based machines. Both protocols have largely been replaced by more robust and scalable networking standards like TCP/IP.
No, not all protocols are routable.
NetBIOS Frames (NBF) protocol is non routable.
Windows XP does not automatically install NetBEUI, as Microsoft considers it a legacy protocol.
A non-routable protocol has less overhead and processing to do, and is more compact. This leads to faster transmission.
The Transport Layer
No it's in the private range.