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// DevOps, cloud & containers

Port 18463: AC Cluster

Port 18463 is assigned by IANA to ac-cluster (AC Cluster).

18463

How ac-cluster works

DevOps, cloud & containers
adminhostac-cluster adminhostac-cluster

Commands sent to port 18463 create and control containers or cluster resources on the host.

Transport
TCP · UDP
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
DevOps, cloud & containers
01 Security

Is port 18463 dangerous?

We have no specific security note for port 18463. Its risk depends on the program actually listening on it. General advice for devops, cloud & containers services:

  • Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.
  • Never expose them to the Internet.
  • Rotate tokens and certificates and audit who has access.
02 Registry

IANA registry entries for port 18463

ServicePortTransportDescriptionReferenceUpdated
ac-cluster 18463 TCP, UDP AC Cluster - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 18463, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18463'      # process listening on 18463
sudo lsof -nP -i :18463

macOS

sudo lsof -nP -i :18463

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18463 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18463
netstat -ano | findstr :18463

From another machine

nmap -p 18463 -sV <host>
sudo nmap -sU -p 18463 <host>
nc -zv <host> 18463

Block it in the firewall

sudo ufw deny 18463/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18463" -Direction Inbound -LocalPort 18463 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18463 used for?

Port 18463 is assigned by IANA to ac-cluster (AC Cluster).

Is port 18463 TCP or UDP?

Port 18463 is registered for TCP and UDP.

Is it safe to open port 18463?

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. Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.

How do I check if port 18463 is open?

On Linux run "ss -ltnup 'sport = :18463'", on macOS "lsof -nP -i :18463", and on Windows "netstat -ano | findstr :18463" to see the local process. From another machine, "nmap -p 18463 <host>" shows whether it is reachable.

05 Related
:2375 Docker API (HTTP) tcp · critical risk :2376 Docker API (TLS) tcp · high risk :6443 Kubernetes API tcp · udp · high risk :10250 Kubelet API tcp · critical risk :2379 etcd tcp · critical risk :8500 Consul tcp · udp · high risk :4505 SaltStack tcp · critical risk :9000 PHP-FPM / SonarQube / Portainer tcp · udp · high risk

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