CyberHunter
Local dataset, no network
// Other services

Port 1655: dec-mbadmin

Port 1655 is assigned by IANA to dec-mbadmin (dec-mbadmin).

1655

How dec-mbadmin works

Other services
client:1655dec-mbadminresponse client:1655dec-mbadminresponse

The client sends a request to port 1655 and the dec-mbadmin 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 1655 dangerous?

We have no specific security note for port 1655. 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 1655

ServicePortTransportDescriptionReferenceUpdated
dec-mbadmin 1655 TCP, UDP dec-mbadmin - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1655, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1655'      # process listening on 1655
sudo lsof -nP -i :1655

macOS

sudo lsof -nP -i :1655

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1655 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1655
netstat -ano | findstr :1655

From another machine

nmap -p 1655 -sV <host>
sudo nmap -sU -p 1655 <host>
nc -zv <host> 1655

Block it in the firewall

sudo ufw deny 1655/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1655" -Direction Inbound -LocalPort 1655 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1655 used for?

Port 1655 is assigned by IANA to dec-mbadmin (dec-mbadmin).

Is port 1655 TCP or UDP?

Port 1655 is registered for TCP and UDP.

Is it safe to open port 1655?

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 1655 is open?

On Linux run "ss -ltnup 'sport = :1655'", on macOS "lsof -nP -i :1655", and on Windows "netstat -ano | findstr :1655" to see the local process. From another machine, "nmap -p 1655 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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