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Port 8201 (trivnet2)

IANA assigns port 8201 to trivnet2: TRIVNET.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
trivnet2 TCP TRIVNET Saar Wilf -
trivnet2 UDP TRIVNET Saar Wilf -

Check what is listening on port 8201

Linux: is anything listening on TCP 8201?
sudo ss -tlnp 'sport = :8201'
Linux: UDP 8201
sudo ss -ulnp 'sport = :8201'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8201
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8201 '
Windows (Command Prompt)
netstat -ano | findstr :8201
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8201 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8201
From Windows
Test-NetConnection HOST -Port 8201
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8201

Block port 8201 in the firewall

ufw
sudo ufw deny 8201/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8201 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8201' -Direction Inbound -Protocol TCP -LocalPort 8201 -Action Block
ufw
sudo ufw deny 8201/udp
iptables
sudo iptables -A INPUT -p udp --dport 8201 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8201' -Direction Inbound -Protocol UDP -LocalPort 8201 -Action Block

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