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// Other services

Port 5221: 3eTI Extensible Management Protocol for OAMP

Port 5221 is assigned by IANA to 3exmp (3eTI Extensible Management Protocol for OAMP).

5221

How 3exmp works

Other services
client:52213exmpresponse client:52213exmpresponse

The client sends a request to port 5221 and the 3exmp service answers.

Transport
TCP
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 5221 dangerous?

We have no specific security note for port 5221. 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 5221

ServicePortTransportDescriptionReferenceUpdated
3exmp 5221 TCP 3eTI Extensible Management Protocol for OAMP - 2010-05-19
-5221-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5221, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5221'      # process listening on 5221
sudo lsof -nP -i :5221

macOS

sudo lsof -nP -i :5221

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5221 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5221
netstat -ano | findstr :5221

From another machine

nmap -p 5221 -sV <host>
nc -zv <host> 5221

Block it in the firewall

sudo ufw deny 5221/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5221" -Direction Inbound -LocalPort 5221 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5221 used for?

Port 5221 is assigned by IANA to 3exmp (3eTI Extensible Management Protocol for OAMP).

Is port 5221 TCP or UDP?

Port 5221 is registered for TCP.

Is it safe to open port 5221?

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 5221 is open?

On Linux run "ss -ltnup 'sport = :5221'", on macOS "lsof -nP -i :5221", and on Windows "netstat -ano | findstr :5221" to see the local process. From another machine, "nmap -p 5221 <host>" shows whether it is reachable.

05 Related
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