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Port 440 (sgcp)

IANA assigns port 440 to sgcp.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sgcp TCP sgcp Marshall Rose -
sgcp UDP sgcp Marshall Rose -

Check what is listening on port 440

Linux: is anything listening on TCP 440?
sudo ss -tlnp 'sport = :440'
Linux: UDP 440
sudo ss -ulnp 'sport = :440'
Linux / macOS: which process owns the port
sudo lsof -nP -i :440
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':440 '
Windows (Command Prompt)
netstat -ano | findstr :440
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 440 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 440
From Windows
Test-NetConnection HOST -Port 440
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 440

Block port 440 in the firewall

ufw
sudo ufw deny 440/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 440 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 440 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 440' -Direction Inbound -Protocol TCP -LocalPort 440 -Action Block
ufw
sudo ufw deny 440/udp
iptables
sudo iptables -A INPUT -p udp --dport 440 -j DROP
nftables
sudo nft add rule inet filter input udp dport 440 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 440' -Direction Inbound -Protocol UDP -LocalPort 440 -Action Block

Related ports

438dsfgw439dasp441decvms-sysmgt442cvc-hostd, cvc_hostd

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