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Port 2000 (cisco-sccp)

IANA assigns port 2000 to cisco-sccp: Cisco SCCP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cisco-sccp TCP Cisco SCCP Dan Wing -
cisco-sccp UDP Cisco SCCp Dan Wing -

Registry dates for this port: registered 2003-11.

Check what is listening on port 2000

Linux: is anything listening on TCP 2000?
sudo ss -tlnp 'sport = :2000'
Linux: UDP 2000
sudo ss -ulnp 'sport = :2000'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2000
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2000 '
Windows (Command Prompt)
netstat -ano | findstr :2000
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2000 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2000
From Windows
Test-NetConnection HOST -Port 2000
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2000

Block port 2000 in the firewall

ufw
sudo ufw deny 2000/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2000 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2000' -Direction Inbound -Protocol TCP -LocalPort 2000 -Action Block
ufw
sudo ufw deny 2000/udp
iptables
sudo iptables -A INPUT -p udp --dport 2000 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2000 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2000' -Direction Inbound -Protocol UDP -LocalPort 2000 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.