HTTPfy

Port 2081 (kme-trap-port)

IANA assigns port 2081 to kme-trap-port: KME PRINTER TRAP PORT.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kme-trap-port TCP KME PRINTER TRAP PORT Masakatsu Matsuo -
kme-trap-port UDP KME PRINTER TRAP PORT Masakatsu Matsuo -

Check what is listening on port 2081

Linux: is anything listening on TCP 2081?
sudo ss -tlnp 'sport = :2081'
Linux: UDP 2081
sudo ss -ulnp 'sport = :2081'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2081
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2081 '
Windows (Command Prompt)
netstat -ano | findstr :2081
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2081 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2081
From Windows
Test-NetConnection HOST -Port 2081
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2081

Block port 2081 in the firewall

ufw
sudo ufw deny 2081/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2081 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2081 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2081' -Direction Inbound -Protocol TCP -LocalPort 2081 -Action Block
ufw
sudo ufw deny 2081/udp
iptables
sudo iptables -A INPUT -p udp --dport 2081 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2081 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2081' -Direction Inbound -Protocol UDP -LocalPort 2081 -Action Block

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