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// Other services

Port 8201: TRIVNET

Port 8201 is assigned by IANA to trivnet2 (TRIVNET).

8201

How trivnet2 works

Other services
client:8201trivnet2response client:8201trivnet2response

The client sends a request to port 8201 and the trivnet2 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 8201 dangerous?

We have no specific security note for port 8201. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 8201

ServicePortTransportDescriptionReferenceUpdated
trivnet2 8201 TCP, UDP TRIVNET - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8201, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8201'      # process listening on 8201
sudo lsof -nP -i :8201

macOS

sudo lsof -nP -i :8201

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8201 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8201
netstat -ano | findstr :8201

From another machine

nmap -p 8201 -sV <host>
sudo nmap -sU -p 8201 <host>
nc -zv <host> 8201

Block it in the firewall

sudo ufw deny 8201/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8201" -Direction Inbound -LocalPort 8201 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8201 used for?

Port 8201 is assigned by IANA to trivnet2 (TRIVNET).

Is port 8201 TCP or UDP?

Port 8201 is registered for TCP and UDP.

Is it safe to open port 8201?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 8201 is open?

On Linux run "ss -ltnup 'sport = :8201'", on macOS "lsof -nP -i :8201", and on Windows "netstat -ano | findstr :8201" to see the local process. From another machine, "nmap -p 8201 <host>" shows whether it is reachable.

05 Related
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