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Port 3559 (cctv-port)

IANA assigns port 3559 to cctv-port: CCTV control port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cctv-port TCP CCTV control port John Skidmore -
cctv-port UDP CCTV control port John Skidmore -

Registry dates for this port: registered 2002-07.

Check what is listening on port 3559

Linux: is anything listening on TCP 3559?
sudo ss -tlnp 'sport = :3559'
Linux: UDP 3559
sudo ss -ulnp 'sport = :3559'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3559
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3559 '
Windows (Command Prompt)
netstat -ano | findstr :3559
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3559 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3559
From Windows
Test-NetConnection HOST -Port 3559
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3559

Block port 3559 in the firewall

ufw
sudo ufw deny 3559/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3559 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3559 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3559' -Direction Inbound -Protocol TCP -LocalPort 3559 -Action Block
ufw
sudo ufw deny 3559/udp
iptables
sudo iptables -A INPUT -p udp --dport 3559 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3559 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3559' -Direction Inbound -Protocol UDP -LocalPort 3559 -Action Block

Related ports

3557personalos-0013558mcp-port3560iniserve-port3561bmc-onekey

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