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Port 8100 (xprint-server)

IANA assigns port 8100 to xprint-server: Xprint Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xprint-server TCP Xprint Server John McKernan -
xprint-server UDP Xprint Server John McKernan -

Check what is listening on port 8100

Linux: is anything listening on TCP 8100?
sudo ss -tlnp 'sport = :8100'
Linux: UDP 8100
sudo ss -ulnp 'sport = :8100'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8100
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8100 '
Windows (Command Prompt)
netstat -ano | findstr :8100
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8100 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8100
From Windows
Test-NetConnection HOST -Port 8100
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8100

Block port 8100 in the firewall

ufw
sudo ufw deny 8100/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8100 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8100 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8100' -Direction Inbound -Protocol TCP -LocalPort 8100 -Action Block
ufw
sudo ufw deny 8100/udp
iptables
sudo iptables -A INPUT -p udp --dport 8100 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8100 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8100' -Direction Inbound -Protocol UDP -LocalPort 8100 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.