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// Other services

Port 1211: Groove DPP

Port 1211 is assigned by IANA to groove-dpp (Groove DPP).

1211

How groove-dpp works

Other services
client:1211groove-dppresponse client:1211groove-dppresponse

The client sends a request to port 1211 and the groove-dpp 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 1211 dangerous?

We have no specific security note for port 1211. 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 1211

ServicePortTransportDescriptionReferenceUpdated
groove-dpp 1211 TCP, UDP Groove DPP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1211, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1211'      # process listening on 1211
sudo lsof -nP -i :1211

macOS

sudo lsof -nP -i :1211

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1211 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1211
netstat -ano | findstr :1211

From another machine

nmap -p 1211 -sV <host>
sudo nmap -sU -p 1211 <host>
nc -zv <host> 1211

Block it in the firewall

sudo ufw deny 1211/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1211" -Direction Inbound -LocalPort 1211 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1211 used for?

Port 1211 is assigned by IANA to groove-dpp (Groove DPP).

Is port 1211 TCP or UDP?

Port 1211 is registered for TCP and UDP.

Is it safe to open port 1211?

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 1211 is open?

On Linux run "ss -ltnup 'sport = :1211'", on macOS "lsof -nP -i :1211", and on Windows "netstat -ano | findstr :1211" to see the local process. From another machine, "nmap -p 1211 <host>" shows whether it is reachable.

05 Related
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