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Port 3944 (sops)

IANA assigns port 3944 to sops: S-Ops Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sops TCP S-Ops Management Stefan Hochuli -
sops UDP S-Ops Management Stefan Hochuli -

Registry dates for this port: registered 2003-12.

Check what is listening on port 3944

Linux: is anything listening on TCP 3944?
sudo ss -tlnp 'sport = :3944'
Linux: UDP 3944
sudo ss -ulnp 'sport = :3944'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3944
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3944 '
Windows (Command Prompt)
netstat -ano | findstr :3944
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3944 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3944
From Windows
Test-NetConnection HOST -Port 3944
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3944

Block port 3944 in the firewall

ufw
sudo ufw deny 3944/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3944 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3944 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3944' -Direction Inbound -Protocol TCP -LocalPort 3944 -Action Block
ufw
sudo ufw deny 3944/udp
iptables
sudo iptables -A INPUT -p udp --dport 3944 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3944 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3944' -Direction Inbound -Protocol UDP -LocalPort 3944 -Action Block

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