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Port 18136 (racf)

IANA assigns port 18136 to racf: z/OS Resource Access Control Facility.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
racf TCP z/OS Resource Access Control Facility Bruce Wells -

Registry dates for this port: registered 2010-10-04.

Check what is listening on port 18136

Linux: is anything listening on TCP 18136?
sudo ss -tlnp 'sport = :18136'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18136
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18136 '
Windows (Command Prompt)
netstat -ano | findstr :18136
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18136 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18136
From Windows
Test-NetConnection HOST -Port 18136

Block port 18136 in the firewall

ufw
sudo ufw deny 18136/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18136 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18136 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18136' -Direction Inbound -Protocol TCP -LocalPort 18136 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.