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// Other services

Port 1255: de-cache-query

Port 1255 is assigned by IANA to de-cache-query (de-cache-query).

1255

How de-cache-query works

Other services
client:1255de-cache-queryresponse client:1255de-cache-queryresponse

The client sends a request to port 1255 and the de-cache-query 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 1255 dangerous?

We have no specific security note for port 1255. 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 1255

ServicePortTransportDescriptionReferenceUpdated
de-cache-query 1255 TCP, UDP de-cache-query - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1255, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1255'      # process listening on 1255
sudo lsof -nP -i :1255

macOS

sudo lsof -nP -i :1255

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1255 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1255
netstat -ano | findstr :1255

From another machine

nmap -p 1255 -sV <host>
sudo nmap -sU -p 1255 <host>
nc -zv <host> 1255

Block it in the firewall

sudo ufw deny 1255/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1255" -Direction Inbound -LocalPort 1255 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1255 used for?

Port 1255 is assigned by IANA to de-cache-query (de-cache-query).

Is port 1255 TCP or UDP?

Port 1255 is registered for TCP and UDP.

Is it safe to open port 1255?

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 1255 is open?

On Linux run "ss -ltnup 'sport = :1255'", on macOS "lsof -nP -i :1255", and on Windows "netstat -ano | findstr :1255" to see the local process. From another machine, "nmap -p 1255 <host>" shows whether it is reachable.

05 Related
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