CyberHunter
Local dataset, no network
// Other services

Port 2253: DTV Channel Request

Port 2253 is assigned by IANA to dtv-chan-req (DTV Channel Request).

2253

How dtv-chan-req works

Other services
client:2253dtv-chan-reqresponse client:2253dtv-chan-reqresponse

The client sends a request to port 2253 and the dtv-chan-req 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 2253 dangerous?

We have no specific security note for port 2253. 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 2253

ServicePortTransportDescriptionReferenceUpdated
dtv-chan-req 2253 TCP, UDP DTV Channel Request - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2253, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2253'      # process listening on 2253
sudo lsof -nP -i :2253

macOS

sudo lsof -nP -i :2253

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2253 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2253
netstat -ano | findstr :2253

From another machine

nmap -p 2253 -sV <host>
sudo nmap -sU -p 2253 <host>
nc -zv <host> 2253

Block it in the firewall

sudo ufw deny 2253/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2253" -Direction Inbound -LocalPort 2253 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2253 used for?

Port 2253 is assigned by IANA to dtv-chan-req (DTV Channel Request).

Is port 2253 TCP or UDP?

Port 2253 is registered for TCP and UDP.

Is it safe to open port 2253?

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 2253 is open?

On Linux run "ss -ltnup 'sport = :2253'", on macOS "lsof -nP -i :2253", and on Windows "netstat -ano | findstr :2253" to see the local process. From another machine, "nmap -p 2253 <host>" shows whether it is reachable.

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