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Port 3161 (doc1lm)

IANA assigns port 3161 to doc1lm: DOC1 License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
doc1lm TCP DOC1 License Manager Greg Goodson -
doc1lm UDP DOC1 License Manager Greg Goodson -

Check what is listening on port 3161

Linux: is anything listening on TCP 3161?
sudo ss -tlnp 'sport = :3161'
Linux: UDP 3161
sudo ss -ulnp 'sport = :3161'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3161
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3161 '
Windows (Command Prompt)
netstat -ano | findstr :3161
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3161 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3161
From Windows
Test-NetConnection HOST -Port 3161
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3161

Block port 3161 in the firewall

ufw
sudo ufw deny 3161/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3161 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3161' -Direction Inbound -Protocol TCP -LocalPort 3161 -Action Block
ufw
sudo ufw deny 3161/udp
iptables
sudo iptables -A INPUT -p udp --dport 3161 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3161 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3161' -Direction Inbound -Protocol UDP -LocalPort 3161 -Action Block

Related ports

3159navegaweb-port3160tip-app-server3162sflm3163res-sap

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