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// Other services

Port 3959: Tree Hopper Networking

Port 3959 is assigned by IANA to treehopper (Tree Hopper Networking).

3959

How treehopper works

Other services
client:3959treehopperresponse client:3959treehopperresponse

The client sends a request to port 3959 and the treehopper 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 3959 dangerous?

We have no specific security note for port 3959. 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 3959

ServicePortTransportDescriptionReferenceUpdated
treehopper 3959 TCP, UDP Tree Hopper Networking - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3959, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3959'      # process listening on 3959
sudo lsof -nP -i :3959

macOS

sudo lsof -nP -i :3959

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3959 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3959
netstat -ano | findstr :3959

From another machine

nmap -p 3959 -sV <host>
sudo nmap -sU -p 3959 <host>
nc -zv <host> 3959

Block it in the firewall

sudo ufw deny 3959/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3959" -Direction Inbound -LocalPort 3959 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3959 used for?

Port 3959 is assigned by IANA to treehopper (Tree Hopper Networking).

Is port 3959 TCP or UDP?

Port 3959 is registered for TCP and UDP.

Is it safe to open port 3959?

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 3959 is open?

On Linux run "ss -ltnup 'sport = :3959'", on macOS "lsof -nP -i :3959", and on Windows "netstat -ano | findstr :3959" to see the local process. From another machine, "nmap -p 3959 <host>" shows whether it is reachable.

05 Related
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