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// Other services

Port 2086: GNUnet

Port 2086 is assigned by IANA to gnunet (GNUnet).

2086

How gnunet works

Other services
client:2086gnunetresponse client:2086gnunetresponse

The client sends a request to port 2086 and the gnunet 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 2086 dangerous?

We have no specific security note for port 2086. 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 2086

ServicePortTransportDescriptionReferenceUpdated
gnunet 2086 TCP, UDP GNUnet - 2002-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 2086, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2086'      # process listening on 2086
sudo lsof -nP -i :2086

macOS

sudo lsof -nP -i :2086

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2086 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2086
netstat -ano | findstr :2086

From another machine

nmap -p 2086 -sV <host>
sudo nmap -sU -p 2086 <host>
nc -zv <host> 2086

Block it in the firewall

sudo ufw deny 2086/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2086" -Direction Inbound -LocalPort 2086 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2086 used for?

Port 2086 is assigned by IANA to gnunet (GNUnet).

Is port 2086 TCP or UDP?

Port 2086 is registered for TCP and UDP.

Is it safe to open port 2086?

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 2086 is open?

On Linux run "ss -ltnup 'sport = :2086'", on macOS "lsof -nP -i :2086", and on Windows "netstat -ano | findstr :2086" to see the local process. From another machine, "nmap -p 2086 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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