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// Other services

Port 18136: z/OS Resource Access Control Facility

Port 18136 is assigned by IANA to racf (z/OS Resource Access Control Facility).

18136

How racf works

Other services
client:18136racfresponse client:18136racfresponse

The client sends a request to port 18136 and the racf 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 18136 dangerous?

We have no specific security note for port 18136. 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 18136

ServicePortTransportDescriptionReferenceUpdated
racf 18136 TCP z/OS Resource Access Control Facility - 2010-10-04
-18136-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 18136, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18136'      # process listening on 18136
sudo lsof -nP -i :18136

macOS

sudo lsof -nP -i :18136

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18136 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18136
netstat -ano | findstr :18136

From another machine

nmap -p 18136 -sV <host>
nc -zv <host> 18136

Block it in the firewall

sudo ufw deny 18136/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18136" -Direction Inbound -LocalPort 18136 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18136 used for?

Port 18136 is assigned by IANA to racf (z/OS Resource Access Control Facility).

Is port 18136 TCP or UDP?

Port 18136 is registered for TCP.

Is it safe to open port 18136?

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 18136 is open?

On Linux run "ss -ltnup 'sport = :18136'", on macOS "lsof -nP -i :18136", and on Windows "netstat -ano | findstr :18136" to see the local process. From another machine, "nmap -p 18136 <host>" shows whether it is reachable.

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