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// Other services

Port 3985: MAPPER TCP/IP server

Port 3985 is assigned by IANA to mapper-mapethd (MAPPER TCP/IP server).

3985

How mapper-mapethd works

Other services
client:3985mapper-mapethdresponse client:3985mapper-mapethdresponse

The client sends a request to port 3985 and the mapper-mapethd 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 3985 dangerous?

We have no specific security note for port 3985. 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 3985

ServicePortTransportDescriptionReferenceUpdated
mapper-mapethd 3985 TCP, UDP MAPPER TCP/IP server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3985, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3985'      # process listening on 3985
sudo lsof -nP -i :3985

macOS

sudo lsof -nP -i :3985

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3985 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3985
netstat -ano | findstr :3985

From another machine

nmap -p 3985 -sV <host>
sudo nmap -sU -p 3985 <host>
nc -zv <host> 3985

Block it in the firewall

sudo ufw deny 3985/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3985" -Direction Inbound -LocalPort 3985 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3985 used for?

Port 3985 is assigned by IANA to mapper-mapethd (MAPPER TCP/IP server).

Is port 3985 TCP or UDP?

Port 3985 is registered for TCP and UDP.

Is it safe to open port 3985?

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 3985 is open?

On Linux run "ss -ltnup 'sport = :3985'", on macOS "lsof -nP -i :3985", and on Windows "netstat -ano | findstr :3985" to see the local process. From another machine, "nmap -p 3985 <host>" shows whether it is reachable.

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