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Port 3081 (tl1-lv)

IANA assigns port 3081 to tl1-lv: TL1-LV.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tl1-lv TCP TL1-LV - -
tl1-lv UDP TL1-LV - -

Check what is listening on port 3081

Linux: is anything listening on TCP 3081?
sudo ss -tlnp 'sport = :3081'
Linux: UDP 3081
sudo ss -ulnp 'sport = :3081'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3081
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3081 '
Windows (Command Prompt)
netstat -ano | findstr :3081
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3081 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3081
From Windows
Test-NetConnection HOST -Port 3081
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3081

Block port 3081 in the firewall

ufw
sudo ufw deny 3081/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3081 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3081 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3081' -Direction Inbound -Protocol TCP -LocalPort 3081 -Action Block
ufw
sudo ufw deny 3081/udp
iptables
sudo iptables -A INPUT -p udp --dport 3081 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3081 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3081' -Direction Inbound -Protocol UDP -LocalPort 3081 -Action Block

Related ports

3079lv-frontpanel3080stm-pproc, stm_pproc3082tl1-raw3083tl1-telnet

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