CyberHunter
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// Other services

Port 3984: MAPPER network node manager

Port 3984 is assigned by IANA to mapper-nodemgr (MAPPER network node manager).

3984

How mapper-nodemgr works

Other services
client:3984mapper-nodemgrresponse client:3984mapper-nodemgrresponse

The client sends a request to port 3984 and the mapper-nodemgr service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3984 dangerous?

We have no specific security note for port 3984. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3984

ServicePortTransportDescriptionReferenceUpdated
mapper-nodemgr 3984 TCP, UDP MAPPER network node manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3984, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3984'      # process listening on 3984
sudo lsof -nP -i :3984

macOS

sudo lsof -nP -i :3984

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3984 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3984
netstat -ano | findstr :3984

From another machine

nmap -p 3984 -sV <host>
sudo nmap -sU -p 3984 <host>
nc -zv <host> 3984

Block it in the firewall

sudo ufw deny 3984/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3984" -Direction Inbound -LocalPort 3984 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3984 used for?

Port 3984 is assigned by IANA to mapper-nodemgr (MAPPER network node manager).

Is port 3984 TCP or UDP?

Port 3984 is registered for TCP and UDP.

Is it safe to open port 3984?

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. Close the port if nothing on the host needs it.

How do I check if port 3984 is open?

On Linux run "ss -ltnup 'sport = :3984'", on macOS "lsof -nP -i :3984", and on Windows "netstat -ano | findstr :3984" to see the local process. From another machine, "nmap -p 3984 <host>" shows whether it is reachable.

05 Related
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