CyberHunter
Local dataset, no network
// Other services

Port 2018:

Port 2018 is assigned by IANA to rellpack (), terminaldb ().

2018

How rellpack works

Other services
client:2018rellpackresponse client:2018rellpackresponse

The client sends a request to port 2018 and the rellpack 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
Other services
01 Security

Is port 2018 dangerous?

We have no specific security note for port 2018. 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 2018

ServicePortTransportDescriptionReferenceUpdated
rellpack 2018 UDP - -
terminaldb 2018 TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2018, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2018'      # process listening on 2018
sudo lsof -nP -i :2018

macOS

sudo lsof -nP -i :2018

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2018 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2018
netstat -ano | findstr :2018

From another machine

nmap -p 2018 -sV <host>
sudo nmap -sU -p 2018 <host>
nc -zv <host> 2018

Block it in the firewall

sudo ufw deny 2018/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2018" -Direction Inbound -LocalPort 2018 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2018 used for?

Port 2018 is assigned by IANA to rellpack (), terminaldb ().

Is port 2018 TCP or UDP?

Port 2018 is registered for UDP and TCP.

Is it safe to open port 2018?

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 2018 is open?

On Linux run "ss -ltnup 'sport = :2018'", on macOS "lsof -nP -i :2018", and on Windows "netstat -ano | findstr :2018" to see the local process. From another machine, "nmap -p 2018 <host>" shows whether it is reachable.

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