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// Other services

Port 10809: Network Block Device

Port 10809 is assigned by IANA to nbd (Network Block Device).

10809

How nbd works

Other services
client:10809nbdresponse client:10809nbdresponse

The client sends a request to port 10809 and the nbd 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 10809 dangerous?

We have no specific security note for port 10809. 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 10809

ServicePortTransportDescriptionReferenceUpdated
nbd 10809 TCP Network Block Device https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md 2024-04-30
-10809-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 10809, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10809'      # process listening on 10809
sudo lsof -nP -i :10809

macOS

sudo lsof -nP -i :10809

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10809 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10809
netstat -ano | findstr :10809

From another machine

nmap -p 10809 -sV <host>
nc -zv <host> 10809

Block it in the firewall

sudo ufw deny 10809/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10809" -Direction Inbound -LocalPort 10809 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10809 used for?

Port 10809 is assigned by IANA to nbd (Network Block Device).

Is port 10809 TCP or UDP?

Port 10809 is registered for TCP.

Is it safe to open port 10809?

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 10809 is open?

On Linux run "ss -ltnup 'sport = :10809'", on macOS "lsof -nP -i :10809", and on Windows "netstat -ano | findstr :10809" to see the local process. From another machine, "nmap -p 10809 <host>" shows whether it is reachable.

05 Related
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