- 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 4189: Path Computation Element Communication Protocol
Port 4189 is assigned by IANA to pcep (Path Computation Element Communication Protocol).
4189
How pcep works
Other servicesThe client sends a request to port 4189 and the pcep 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 4189 dangerous?
We have no specific security note for port 4189. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 4189
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| pcep | 4189 | TCP | Path Computation Element Communication Protocol | - | - |
| - | 4189 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4189, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4189' # process listening on 4189
sudo lsof -nP -i :4189macOS
sudo lsof -nP -i :4189
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4189 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4189 netstat -ano | findstr :4189
From another machine
nmap -p 4189 -sV <host> nc -zv <host> 4189
Block it in the firewall
sudo ufw deny 4189/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4189" -Direction Inbound -LocalPort 4189 -Protocol TCP -Action Block # Windows
What is port 4189 used for?
Port 4189 is assigned by IANA to pcep (Path Computation Element Communication Protocol).
Is port 4189 TCP or UDP?
Port 4189 is registered for TCP.
Is it safe to open port 4189?
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 4189 is open?
On Linux run "ss -ltnup 'sport = :4189'", on macOS "lsof -nP -i :4189", and on Windows "netstat -ano | findstr :4189" to see the local process. From another machine, "nmap -p 4189 <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