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// DevOps, cloud & containers

Port 1852: Virtual Time

Port 1852 is assigned by IANA to virtual-time (Virtual Time).

1852

How virtual-time works

DevOps, cloud & containers
adminhostvirtual-time adminhostvirtual-time

Commands sent to port 1852 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 1852 dangerous?

We have no specific security note for port 1852. 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 1852

ServicePortTransportDescriptionReferenceUpdated
virtual-time 1852 TCP, UDP Virtual Time - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1852, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1852'      # process listening on 1852
sudo lsof -nP -i :1852

macOS

sudo lsof -nP -i :1852

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1852 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1852
netstat -ano | findstr :1852

From another machine

nmap -p 1852 -sV <host>
sudo nmap -sU -p 1852 <host>
nc -zv <host> 1852

Block it in the firewall

sudo ufw deny 1852/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1852" -Direction Inbound -LocalPort 1852 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1852 used for?

Port 1852 is assigned by IANA to virtual-time (Virtual Time).

Is port 1852 TCP or UDP?

Port 1852 is registered for TCP and UDP.

Is it safe to open port 1852?

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 1852 is open?

On Linux run "ss -ltnup 'sport = :1852'", on macOS "lsof -nP -i :1852", and on Windows "netstat -ano | findstr :1852" to see the local process. From another machine, "nmap -p 1852 <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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