CyberHunter
Local dataset, no network
// Other services

Port 603: IDXP

Port 603 is assigned by IANA to idxp (IDXP).

603

How idxp works

Other services
client:603idxpresponse client:603idxpresponse

The client sends a request to port 603 and the idxp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 603 dangerous?

We have no specific security note for port 603. 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 603

ServicePortTransportDescriptionReferenceUpdated
idxp 603 TCP, UDP IDXP RFC 4767 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 603, and is it reachable?

Linux

sudo ss -ltnup 'sport = :603'      # process listening on 603
sudo lsof -nP -i :603

macOS

sudo lsof -nP -i :603

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 603 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 603
netstat -ano | findstr :603

From another machine

nmap -p 603 -sV <host>
sudo nmap -sU -p 603 <host>
nc -zv <host> 603

Block it in the firewall

sudo ufw deny 603/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 603" -Direction Inbound -LocalPort 603 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 603 used for?

Port 603 is assigned by IANA to idxp (IDXP).

Is port 603 TCP or UDP?

Port 603 is registered for TCP and UDP.

Is it safe to open port 603?

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 603 is open?

On Linux run "ss -ltnup 'sport = :603'", on macOS "lsof -nP -i :603", and on Windows "netstat -ano | findstr :603" to see the local process. From another machine, "nmap -p 603 <host>" shows whether it is reachable.

05 Related
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