A dynamic port that mostly turns up on busier Windows servers and domain controllers.
49156 is in the IANA dynamic range, so it has no registered owner and any service here was assigned the port at runtime. In practice it is a Windows RPC endpoint on a host running enough services to reach this far up the pool, which is why domain controllers commonly show a run of 49152 through 49157 open while a workstation shows only the first two or three. Nmap records it open on roughly 0.5% of hosts.
Do not expose
A long unbroken run of open ports from 49152 is a Windows server signature; that whole range should be reachable only from inside the network.
$ nmap -sV -Pn -p 49152-49157 TARGETSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.