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// Other services

Port 18104: RAD PDF Service

Port 18104 is assigned by IANA to radpdf (RAD PDF Service).

18104

How radpdf works

Other services
client:18104radpdfresponse client:18104radpdfresponse

The client sends a request to port 18104 and the radpdf service answers.

Transport
TCP
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 18104 dangerous?

We have no specific security note for port 18104. 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 18104

ServicePortTransportDescriptionReferenceUpdated
radpdf 18104 TCP RAD PDF Service - 2010-10-15
-18104-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 18104, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18104'      # process listening on 18104
sudo lsof -nP -i :18104

macOS

sudo lsof -nP -i :18104

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18104 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18104
netstat -ano | findstr :18104

From another machine

nmap -p 18104 -sV <host>
nc -zv <host> 18104

Block it in the firewall

sudo ufw deny 18104/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18104" -Direction Inbound -LocalPort 18104 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18104 used for?

Port 18104 is assigned by IANA to radpdf (RAD PDF Service).

Is port 18104 TCP or UDP?

Port 18104 is registered for TCP.

Is it safe to open port 18104?

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 18104 is open?

On Linux run "ss -ltnup 'sport = :18104'", on macOS "lsof -nP -i :18104", and on Windows "netstat -ano | findstr :18104" to see the local process. From another machine, "nmap -p 18104 <host>" shows whether it is reachable.

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