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Port 39681 (turbonote-1)

IANA assigns port 39681 to turbonote-1: TurboNote Default Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
turbonote-1 TCP TurboNote Default Port Peter Hyde -
turbonote-1 UDP TurboNote Default Port Peter Hyde -

Check what is listening on port 39681

Linux: is anything listening on TCP 39681?
sudo ss -tlnp 'sport = :39681'
Linux: UDP 39681
sudo ss -ulnp 'sport = :39681'
Linux / macOS: which process owns the port
sudo lsof -nP -i :39681
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':39681 '
Windows (Command Prompt)
netstat -ano | findstr :39681
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 39681 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 39681
From Windows
Test-NetConnection HOST -Port 39681
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 39681

Block port 39681 in the firewall

ufw
sudo ufw deny 39681/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 39681 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 39681 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 39681' -Direction Inbound -Protocol TCP -LocalPort 39681 -Action Block
ufw
sudo ufw deny 39681/udp
iptables
sudo iptables -A INPUT -p udp --dport 39681 -j DROP
nftables
sudo nft add rule inet filter input udp dport 39681 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 39681' -Direction Inbound -Protocol UDP -LocalPort 39681 -Action Block

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