HTTPfy

Port 3083 (tl1-telnet)

IANA assigns port 3083 to tl1-telnet: TL1-TELNET.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tl1-telnet TCP TL1-TELNET SONET Internetworkin -
tl1-telnet UDP TL1-TELNET SONET Internetworkin -

Check what is listening on port 3083

Linux: is anything listening on TCP 3083?
sudo ss -tlnp 'sport = :3083'
Linux: UDP 3083
sudo ss -ulnp 'sport = :3083'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3083
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3083 '
Windows (Command Prompt)
netstat -ano | findstr :3083
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3083
From Windows
Test-NetConnection HOST -Port 3083
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3083

Block port 3083 in the firewall

ufw
sudo ufw deny 3083/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3083 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3083' -Direction Inbound -Protocol TCP -LocalPort 3083 -Action Block
ufw
sudo ufw deny 3083/udp
iptables
sudo iptables -A INPUT -p udp --dport 3083 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3083' -Direction Inbound -Protocol UDP -LocalPort 3083 -Action Block

Related ports

3081tl1-lv3082tl1-raw3084itm-mccs3085pcihreq

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