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Port 6689 (tsa)

IANA assigns port 6689 to tsa: Tofino Security Appliance.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tsa TCP Tofino Security Appliance Scott Howard -
tsa UDP Tofino Security Appliance Scott Howard -

Registry dates for this port: registered 2009-10-13.

Check what is listening on port 6689

Linux: is anything listening on TCP 6689?
sudo ss -tlnp 'sport = :6689'
Linux: UDP 6689
sudo ss -ulnp 'sport = :6689'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6689
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6689 '
Windows (Command Prompt)
netstat -ano | findstr :6689
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6689 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6689
From Windows
Test-NetConnection HOST -Port 6689
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6689

Block port 6689 in the firewall

ufw
sudo ufw deny 6689/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6689 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6689 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6689' -Direction Inbound -Protocol TCP -LocalPort 6689 -Action Block
ufw
sudo ufw deny 6689/udp
iptables
sudo iptables -A INPUT -p udp --dport 6689 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6689 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6689' -Direction Inbound -Protocol UDP -LocalPort 6689 -Action Block

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6687clever-ctrace6688clever-tcpip6690cleverdetect6696babel

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