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Port 3914 (listcrt-port-2)

IANA assigns port 3914 to listcrt-port-2: ListCREATOR Port 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
listcrt-port-2 TCP ListCREATOR Port 2 Tomokazu Asai -
listcrt-port-2 UDP ListCREATOR Port 2 Tomokazu Asai -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3914

Linux: is anything listening on TCP 3914?
sudo ss -tlnp 'sport = :3914'
Linux: UDP 3914
sudo ss -ulnp 'sport = :3914'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3914
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3914 '
Windows (Command Prompt)
netstat -ano | findstr :3914
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3914 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3914
From Windows
Test-NetConnection HOST -Port 3914
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3914

Block port 3914 in the firewall

ufw
sudo ufw deny 3914/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3914 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3914 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3914' -Direction Inbound -Protocol TCP -LocalPort 3914 -Action Block
ufw
sudo ufw deny 3914/udp
iptables
sudo iptables -A INPUT -p udp --dport 3914 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3914 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3914' -Direction Inbound -Protocol UDP -LocalPort 3914 -Action Block

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