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// Network services

Port 49001: Nuance Unity Service Discovery Protocol

Port 49001 is assigned by IANA to nusdp-disc (Nuance Unity Service Discovery Protocol), nusrp (Nuance Unity Service Request Protocol).

49001

How nusdp-disc works

Network services
client:49001nusdp-discresponse client:49001nusdp-discresponse

The client sends a request to port 49001 and the nusdp-disc service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 49001 dangerous?

We have no specific security note for port 49001. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 49001

ServicePortTransportDescriptionReferenceUpdated
nusdp-disc 49001 UDP Nuance Unity Service Discovery Protocol - 2017-04-20
nusrp 49001 TCP Nuance Unity Service Request Protocol - 2017-04-20

// source: IANA service name and port number registry

03 Check it

Which program uses port 49001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :49001'      # process listening on 49001
sudo lsof -nP -i :49001

macOS

sudo lsof -nP -i :49001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 49001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 49001
netstat -ano | findstr :49001

From another machine

nmap -p 49001 -sV <host>
sudo nmap -sU -p 49001 <host>
nc -zv <host> 49001

Block it in the firewall

sudo ufw deny 49001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 49001" -Direction Inbound -LocalPort 49001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 49001 used for?

Port 49001 is assigned by IANA to nusdp-disc (Nuance Unity Service Discovery Protocol), nusrp (Nuance Unity Service Request Protocol).

Is port 49001 TCP or UDP?

Port 49001 is registered for UDP and TCP.

Is it safe to open port 49001?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 49001 is open?

On Linux run "ss -ltnup 'sport = :49001'", on macOS "lsof -nP -i :49001", and on Windows "netstat -ano | findstr :49001" to see the local process. From another machine, "nmap -p 49001 <host>" shows whether it is reachable.

05 Related
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