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Port 1941 (dic-aida)

IANA assigns port 1941 to dic-aida: DIC-Aida.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dic-aida TCP DIC-Aida Frans S C Witte -
dic-aida UDP DIC-Aida Frans S C Witte -

Check what is listening on port 1941

Linux: is anything listening on TCP 1941?
sudo ss -tlnp 'sport = :1941'
Linux: UDP 1941
sudo ss -ulnp 'sport = :1941'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1941
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1941 '
Windows (Command Prompt)
netstat -ano | findstr :1941
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1941 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1941
From Windows
Test-NetConnection HOST -Port 1941
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1941

Block port 1941 in the firewall

ufw
sudo ufw deny 1941/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1941 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1941 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1941' -Direction Inbound -Protocol TCP -LocalPort 1941 -Action Block
ufw
sudo ufw deny 1941/udp
iptables
sudo iptables -A INPUT -p udp --dport 1941 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1941 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1941' -Direction Inbound -Protocol UDP -LocalPort 1941 -Action Block

Related ports

1939jvserver1940jvclient1942res1943beeyond-media

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