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// Other services

Port 3221: XML NM over TCP

Port 3221 is assigned by IANA to xnm-clear-text (XML NM over TCP).

3221

How xnm-clear-text works

Other services
client:3221xnm-clear-textresponse client:3221xnm-clear-textresponse

The client sends a request to port 3221 and the xnm-clear-text 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 3221 dangerous?

We have no specific security note for port 3221. 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 3221

ServicePortTransportDescriptionReferenceUpdated
xnm-clear-text 3221 TCP, UDP XML NM over TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3221, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3221'      # process listening on 3221
sudo lsof -nP -i :3221

macOS

sudo lsof -nP -i :3221

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3221 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3221
netstat -ano | findstr :3221

From another machine

nmap -p 3221 -sV <host>
sudo nmap -sU -p 3221 <host>
nc -zv <host> 3221

Block it in the firewall

sudo ufw deny 3221/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3221" -Direction Inbound -LocalPort 3221 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3221 used for?

Port 3221 is assigned by IANA to xnm-clear-text (XML NM over TCP).

Is port 3221 TCP or UDP?

Port 3221 is registered for TCP and UDP.

Is it safe to open port 3221?

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 3221 is open?

On Linux run "ss -ltnup 'sport = :3221'", on macOS "lsof -nP -i :3221", and on Windows "netstat -ano | findstr :3221" to see the local process. From another machine, "nmap -p 3221 <host>" shows whether it is reachable.

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