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// Other services

Port 9211: OMA Mobile Location Protocol Secure

Port 9211 is assigned by IANA to oma-mlp-s (OMA Mobile Location Protocol Secure).

9211

How oma-mlp-s works

Other services
client:9211oma-mlp-sresponse client:9211oma-mlp-sresponse

The client sends a request to port 9211 and the oma-mlp-s 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 9211 dangerous?

We have no specific security note for port 9211. 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 9211

ServicePortTransportDescriptionReferenceUpdated
oma-mlp-s 9211 TCP, UDP OMA Mobile Location Protocol Secure - 2002-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 9211, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9211'      # process listening on 9211
sudo lsof -nP -i :9211

macOS

sudo lsof -nP -i :9211

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9211 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9211
netstat -ano | findstr :9211

From another machine

nmap -p 9211 -sV <host>
sudo nmap -sU -p 9211 <host>
nc -zv <host> 9211

Block it in the firewall

sudo ufw deny 9211/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9211" -Direction Inbound -LocalPort 9211 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9211 used for?

Port 9211 is assigned by IANA to oma-mlp-s (OMA Mobile Location Protocol Secure).

Is port 9211 TCP or UDP?

Port 9211 is registered for TCP and UDP.

Is it safe to open port 9211?

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 9211 is open?

On Linux run "ss -ltnup 'sport = :9211'", on macOS "lsof -nP -i :9211", and on Windows "netstat -ano | findstr :9211" to see the local process. From another machine, "nmap -p 9211 <host>" shows whether it is reachable.

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