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// Other services

Port 1253: q55-pcc

Port 1253 is assigned by IANA to q55-pcc (q55-pcc).

1253

How q55-pcc works

Other services
client:1253q55-pccresponse client:1253q55-pccresponse

The client sends a request to port 1253 and the q55-pcc 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 1253 dangerous?

We have no specific security note for port 1253. 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 1253

ServicePortTransportDescriptionReferenceUpdated
q55-pcc 1253 TCP, UDP q55-pcc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1253, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1253'      # process listening on 1253
sudo lsof -nP -i :1253

macOS

sudo lsof -nP -i :1253

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1253 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1253
netstat -ano | findstr :1253

From another machine

nmap -p 1253 -sV <host>
sudo nmap -sU -p 1253 <host>
nc -zv <host> 1253

Block it in the firewall

sudo ufw deny 1253/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1253" -Direction Inbound -LocalPort 1253 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1253 used for?

Port 1253 is assigned by IANA to q55-pcc (q55-pcc).

Is port 1253 TCP or UDP?

Port 1253 is registered for TCP and UDP.

Is it safe to open port 1253?

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 1253 is open?

On Linux run "ss -ltnup 'sport = :1253'", on macOS "lsof -nP -i :1253", and on Windows "netstat -ano | findstr :1253" to see the local process. From another machine, "nmap -p 1253 <host>" shows whether it is reachable.

05 Related
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