- 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.
Port 18104: RAD PDF Service
Port 18104 is assigned by IANA to radpdf (RAD PDF Service).
18104
How radpdf works
Other servicesThe 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
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:
IANA registry entries for port 18104
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| radpdf | 18104 | TCP | RAD PDF Service | - | 2010-10-15 |
| - | 18104 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 18104, and is it reachable?
Linux
sudo ss -ltnup 'sport = :18104' # process listening on 18104
sudo lsof -nP -i :18104macOS
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
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.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp