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// DevOps, cloud & containers

Port 1533: Virtual Places Software

Port 1533 is assigned by IANA to virtual-places (Virtual Places Software).

1533

How virtual-places works

DevOps, cloud & containers
adminhostvirtual-places adminhostvirtual-places

Commands sent to port 1533 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 1533 dangerous?

We have no specific security note for port 1533. 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 1533

ServicePortTransportDescriptionReferenceUpdated
virtual-places 1533 TCP, UDP Virtual Places Software - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1533, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1533'      # process listening on 1533
sudo lsof -nP -i :1533

macOS

sudo lsof -nP -i :1533

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1533 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1533
netstat -ano | findstr :1533

From another machine

nmap -p 1533 -sV <host>
sudo nmap -sU -p 1533 <host>
nc -zv <host> 1533

Block it in the firewall

sudo ufw deny 1533/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1533" -Direction Inbound -LocalPort 1533 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1533 used for?

Port 1533 is assigned by IANA to virtual-places (Virtual Places Software).

Is port 1533 TCP or UDP?

Port 1533 is registered for TCP and UDP.

Is it safe to open port 1533?

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 1533 is open?

On Linux run "ss -ltnup 'sport = :1533'", on macOS "lsof -nP -i :1533", and on Windows "netstat -ano | findstr :1533" to see the local process. From another machine, "nmap -p 1533 <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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