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// Other services

Port 2604: NSC CCS

Port 2604 is assigned by IANA to nsc-ccs (NSC CCS).

2604

How nsc-ccs works

Other services
client:2604nsc-ccsresponse client:2604nsc-ccsresponse

The client sends a request to port 2604 and the nsc-ccs 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 2604 dangerous?

We have no specific security note for port 2604. 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 2604

ServicePortTransportDescriptionReferenceUpdated
nsc-ccs 2604 TCP, UDP NSC CCS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2604, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2604'      # process listening on 2604
sudo lsof -nP -i :2604

macOS

sudo lsof -nP -i :2604

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2604 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2604
netstat -ano | findstr :2604

From another machine

nmap -p 2604 -sV <host>
sudo nmap -sU -p 2604 <host>
nc -zv <host> 2604

Block it in the firewall

sudo ufw deny 2604/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2604" -Direction Inbound -LocalPort 2604 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2604 used for?

Port 2604 is assigned by IANA to nsc-ccs (NSC CCS).

Is port 2604 TCP or UDP?

Port 2604 is registered for TCP and UDP.

Is it safe to open port 2604?

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 2604 is open?

On Linux run "ss -ltnup 'sport = :2604'", on macOS "lsof -nP -i :2604", and on Windows "netstat -ano | findstr :2604" to see the local process. From another machine, "nmap -p 2604 <host>" shows whether it is reachable.

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