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// Other services

Port 1256: de-server

Port 1256 is assigned by IANA to de-server (de-server).

1256

How de-server works

Other services
client:1256de-serverresponse client:1256de-serverresponse

The client sends a request to port 1256 and the de-server 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 1256 dangerous?

We have no specific security note for port 1256. 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 1256

ServicePortTransportDescriptionReferenceUpdated
de-server 1256 TCP, UDP de-server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1256, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1256'      # process listening on 1256
sudo lsof -nP -i :1256

macOS

sudo lsof -nP -i :1256

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1256 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1256
netstat -ano | findstr :1256

From another machine

nmap -p 1256 -sV <host>
sudo nmap -sU -p 1256 <host>
nc -zv <host> 1256

Block it in the firewall

sudo ufw deny 1256/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1256" -Direction Inbound -LocalPort 1256 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1256 used for?

Port 1256 is assigned by IANA to de-server (de-server).

Is port 1256 TCP or UDP?

Port 1256 is registered for TCP and UDP.

Is it safe to open port 1256?

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 1256 is open?

On Linux run "ss -ltnup 'sport = :1256'", on macOS "lsof -nP -i :1256", and on Windows "netstat -ano | findstr :1256" to see the local process. From another machine, "nmap -p 1256 <host>" shows whether it is reachable.

05 Related
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