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// Other services

Port 3918: PacketCableMultimediaCOPS

Port 3918 is assigned by IANA to pktcablemmcops (PacketCableMultimediaCOPS).

3918

How pktcablemmcops works

Other services
client:3918pktcablemmcopsresponse client:3918pktcablemmcopsresponse

The client sends a request to port 3918 and the pktcablemmcops 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 3918 dangerous?

We have no specific security note for port 3918. 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 3918

ServicePortTransportDescriptionReferenceUpdated
pktcablemmcops 3918 TCP, UDP PacketCableMultimediaCOPS - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3918, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3918'      # process listening on 3918
sudo lsof -nP -i :3918

macOS

sudo lsof -nP -i :3918

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3918 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3918
netstat -ano | findstr :3918

From another machine

nmap -p 3918 -sV <host>
sudo nmap -sU -p 3918 <host>
nc -zv <host> 3918

Block it in the firewall

sudo ufw deny 3918/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3918" -Direction Inbound -LocalPort 3918 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3918 used for?

Port 3918 is assigned by IANA to pktcablemmcops (PacketCableMultimediaCOPS).

Is port 3918 TCP or UDP?

Port 3918 is registered for TCP and UDP.

Is it safe to open port 3918?

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 3918 is open?

On Linux run "ss -ltnup 'sport = :3918'", on macOS "lsof -nP -i :3918", and on Windows "netstat -ano | findstr :3918" to see the local process. From another machine, "nmap -p 3918 <host>" shows whether it is reachable.

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