CyberHunter
Local dataset, no network
// Other services

Port 1373: Chromagrafx

Port 1373 is assigned by IANA to chromagrafx (Chromagrafx).

1373

How chromagrafx works

Other services
client:1373chromagrafxresponse client:1373chromagrafxresponse

The client sends a request to port 1373 and the chromagrafx 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 1373 dangerous?

We have no specific security note for port 1373. 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 1373

ServicePortTransportDescriptionReferenceUpdated
chromagrafx 1373 TCP, UDP Chromagrafx - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1373, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1373'      # process listening on 1373
sudo lsof -nP -i :1373

macOS

sudo lsof -nP -i :1373

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1373 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1373
netstat -ano | findstr :1373

From another machine

nmap -p 1373 -sV <host>
sudo nmap -sU -p 1373 <host>
nc -zv <host> 1373

Block it in the firewall

sudo ufw deny 1373/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1373" -Direction Inbound -LocalPort 1373 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1373 used for?

Port 1373 is assigned by IANA to chromagrafx (Chromagrafx).

Is port 1373 TCP or UDP?

Port 1373 is registered for TCP and UDP.

Is it safe to open port 1373?

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 1373 is open?

On Linux run "ss -ltnup 'sport = :1373'", on macOS "lsof -nP -i :1373", and on Windows "netstat -ano | findstr :1373" to see the local process. From another machine, "nmap -p 1373 <host>" shows whether it is reachable.

05 Related
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