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Port 106 (3com-tsmux)

IANA assigns port 106 to 3com-tsmux: 3COM-TSMUX.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3com-tsmux TCP 3COM-TSMUX Jeremy Siegel -
3com-tsmux UDP 3COM-TSMUX Jeremy Siegel -

Check what is listening on port 106

Linux: is anything listening on TCP 106?
sudo ss -tlnp 'sport = :106'
Linux: UDP 106
sudo ss -ulnp 'sport = :106'
Linux / macOS: which process owns the port
sudo lsof -nP -i :106
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':106 '
Windows (Command Prompt)
netstat -ano | findstr :106
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 106 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 106
From Windows
Test-NetConnection HOST -Port 106
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 106

Block port 106 in the firewall

ufw
sudo ufw deny 106/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 106 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 106 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 106' -Direction Inbound -Protocol TCP -LocalPort 106 -Action Block
ufw
sudo ufw deny 106/udp
iptables
sudo iptables -A INPUT -p udp --dport 106 -j DROP
nftables
sudo nft add rule inet filter input udp dport 106 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 106' -Direction Inbound -Protocol UDP -LocalPort 106 -Action Block

Related ports

104acr-nema105cso, csnet-ns107rtelnet108snagas

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