CyberHunter
Local dataset, no network
// Other services

Port 1656: dec-mbadmin-h

Port 1656 is assigned by IANA to dec-mbadmin-h (dec-mbadmin-h).

1656

How dec-mbadmin-h works

Other services
client:1656dec-mbadmin-hresponse client:1656dec-mbadmin-hresponse

The client sends a request to port 1656 and the dec-mbadmin-h 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 1656 dangerous?

We have no specific security note for port 1656. 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 1656

ServicePortTransportDescriptionReferenceUpdated
dec-mbadmin-h 1656 TCP, UDP dec-mbadmin-h - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1656, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1656'      # process listening on 1656
sudo lsof -nP -i :1656

macOS

sudo lsof -nP -i :1656

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1656 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1656
netstat -ano | findstr :1656

From another machine

nmap -p 1656 -sV <host>
sudo nmap -sU -p 1656 <host>
nc -zv <host> 1656

Block it in the firewall

sudo ufw deny 1656/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1656" -Direction Inbound -LocalPort 1656 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1656 used for?

Port 1656 is assigned by IANA to dec-mbadmin-h (dec-mbadmin-h).

Is port 1656 TCP or UDP?

Port 1656 is registered for TCP and UDP.

Is it safe to open port 1656?

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 1656 is open?

On Linux run "ss -ltnup 'sport = :1656'", on macOS "lsof -nP -i :1656", and on Windows "netstat -ano | findstr :1656" to see the local process. From another machine, "nmap -p 1656 <host>" shows whether it is reachable.

05 Related
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