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Port 2604 (nsc-ccs)

IANA assigns port 2604 to nsc-ccs: NSC CCS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nsc-ccs TCP NSC CCS - -
nsc-ccs UDP NSC CCS - -

Check what is listening on port 2604

Linux: is anything listening on TCP 2604?
sudo ss -tlnp 'sport = :2604'
Linux: UDP 2604
sudo ss -ulnp 'sport = :2604'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2604
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2604 '
Windows (Command Prompt)
netstat -ano | findstr :2604
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2604 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2604
From Windows
Test-NetConnection HOST -Port 2604
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2604

Block port 2604 in the firewall

ufw
sudo ufw deny 2604/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2604 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2604 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2604' -Direction Inbound -Protocol TCP -LocalPort 2604 -Action Block
ufw
sudo ufw deny 2604/udp
iptables
sudo iptables -A INPUT -p udp --dport 2604 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2604 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2604' -Direction Inbound -Protocol UDP -LocalPort 2604 -Action Block

Related ports

2602discp-server2603servicemeter2605nsc-posa2606netmon

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.