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Port 1969 (lipsinc1)

IANA assigns port 1969 to lipsinc1: LIPSinc 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lipsinc1 TCP LIPSinc 1 Robert Armington -
lipsinc1 UDP LIPSinc 1 Robert Armington -

Check what is listening on port 1969

Linux: is anything listening on TCP 1969?
sudo ss -tlnp 'sport = :1969'
Linux: UDP 1969
sudo ss -ulnp 'sport = :1969'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1969
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1969 '
Windows (Command Prompt)
netstat -ano | findstr :1969
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1969 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1969
From Windows
Test-NetConnection HOST -Port 1969
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1969

Block port 1969 in the firewall

ufw
sudo ufw deny 1969/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1969 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1969 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1969' -Direction Inbound -Protocol TCP -LocalPort 1969 -Action Block
ufw
sudo ufw deny 1969/udp
iptables
sudo iptables -A INPUT -p udp --dport 1969 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1969 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1969' -Direction Inbound -Protocol UDP -LocalPort 1969 -Action Block

Related ports

1967sns-quote1968lipsinc1970netop-rc1971netop-school

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