The Natural Philosopher wrote:

I think this is all a red herring.

Maybe ... on corporate networks you have domain controllers acting as
DNS (and even still WINS) servers to allow servers to register
themselves and clients to find servers without resorting to "shouty"
protocols

SMB servers advertise themselves on a
local area network using a particular protocol

" nmbd

The nmbd server daemon understands and replies to NetBIOS name service
requests such as those produced by SMB/CIFS in Windows-based systems.
These systems include Windows 95/98/ME, Windows NT, Windows 2000,
Windows XP, and LanManager clients. It also participates in the browsing
protocols that make up the Windows Network Neighborhood view. The
default port that the server listens to for NMB traffic is UDP port 137.
The nmbd daemon is controlled by the smb service. "

The netbios 137-139 ports are pretty old hat nowadays, the smb 445 port
method has been the default since (IIRC) Vista.

Seems a lot of routers than include NAS functionality use ancient
versions of SAMBA