CyberHunter
Local dataset, no network
// Other services

Port 1657: fujitsu-mmpdc

Port 1657 is assigned by IANA to fujitsu-mmpdc (fujitsu-mmpdc).

1657

How fujitsu-mmpdc works

Other services
client:1657fujitsu-mmpdcresponse client:1657fujitsu-mmpdcresponse

The client sends a request to port 1657 and the fujitsu-mmpdc 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 1657 dangerous?

We have no specific security note for port 1657. 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 1657

ServicePortTransportDescriptionReferenceUpdated
fujitsu-mmpdc 1657 TCP, UDP fujitsu-mmpdc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1657, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1657'      # process listening on 1657
sudo lsof -nP -i :1657

macOS

sudo lsof -nP -i :1657

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1657 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1657
netstat -ano | findstr :1657

From another machine

nmap -p 1657 -sV <host>
sudo nmap -sU -p 1657 <host>
nc -zv <host> 1657

Block it in the firewall

sudo ufw deny 1657/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1657" -Direction Inbound -LocalPort 1657 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1657 used for?

Port 1657 is assigned by IANA to fujitsu-mmpdc (fujitsu-mmpdc).

Is port 1657 TCP or UDP?

Port 1657 is registered for TCP and UDP.

Is it safe to open port 1657?

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 1657 is open?

On Linux run "ss -ltnup 'sport = :1657'", on macOS "lsof -nP -i :1657", and on Windows "netstat -ano | findstr :1657" to see the local process. From another machine, "nmap -p 1657 <host>" shows whether it is reachable.

05 Related
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