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// Other services

Port 2857: SimCtIP

Port 2857 is assigned by IANA to simctlp (SimCtIP).

2857

How simctlp works

Other services
client:2857simctlpresponse client:2857simctlpresponse

The client sends a request to port 2857 and the simctlp service answers.

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
Other services
01 Security

Is port 2857 dangerous?

We have no specific security note for port 2857. 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 2857

ServicePortTransportDescriptionReferenceUpdated
simctlp 2857 TCP, UDP SimCtIP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2857, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2857'      # process listening on 2857
sudo lsof -nP -i :2857

macOS

sudo lsof -nP -i :2857

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2857 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2857
netstat -ano | findstr :2857

From another machine

nmap -p 2857 -sV <host>
sudo nmap -sU -p 2857 <host>
nc -zv <host> 2857

Block it in the firewall

sudo ufw deny 2857/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2857" -Direction Inbound -LocalPort 2857 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2857 used for?

Port 2857 is assigned by IANA to simctlp (SimCtIP).

Is port 2857 TCP or UDP?

Port 2857 is registered for TCP and UDP.

Is it safe to open port 2857?

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 2857 is open?

On Linux run "ss -ltnup 'sport = :2857'", on macOS "lsof -nP -i :2857", and on Windows "netstat -ano | findstr :2857" to see the local process. From another machine, "nmap -p 2857 <host>" shows whether it is reachable.

05 Related
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