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// Other services

Port 2818: rmlnk

Port 2818 is assigned by IANA to rmlnk (rmlnk).

2818

How rmlnk works

Other services
client:2818rmlnkresponse client:2818rmlnkresponse

The client sends a request to port 2818 and the rmlnk 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 2818 dangerous?

We have no specific security note for port 2818. 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 2818

ServicePortTransportDescriptionReferenceUpdated
rmlnk 2818 TCP, UDP rmlnk - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2818, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2818'      # process listening on 2818
sudo lsof -nP -i :2818

macOS

sudo lsof -nP -i :2818

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2818 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2818
netstat -ano | findstr :2818

From another machine

nmap -p 2818 -sV <host>
sudo nmap -sU -p 2818 <host>
nc -zv <host> 2818

Block it in the firewall

sudo ufw deny 2818/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2818" -Direction Inbound -LocalPort 2818 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2818 used for?

Port 2818 is assigned by IANA to rmlnk (rmlnk).

Is port 2818 TCP or UDP?

Port 2818 is registered for TCP and UDP.

Is it safe to open port 2818?

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 2818 is open?

On Linux run "ss -ltnup 'sport = :2818'", on macOS "lsof -nP -i :2818", and on Windows "netstat -ano | findstr :2818" to see the local process. From another machine, "nmap -p 2818 <host>" shows whether it is reachable.

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