CyberHunter
Local dataset, no network
// Other services

Port 1858: PrivateArk

Port 1858 is assigned by IANA to privateark (PrivateArk).

1858

How privateark works

Other services
client:1858privatearkresponse client:1858privatearkresponse

The client sends a request to port 1858 and the privateark 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 1858 dangerous?

We have no specific security note for port 1858. 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 1858

ServicePortTransportDescriptionReferenceUpdated
privateark 1858 TCP, UDP PrivateArk - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1858, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1858'      # process listening on 1858
sudo lsof -nP -i :1858

macOS

sudo lsof -nP -i :1858

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1858 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1858
netstat -ano | findstr :1858

From another machine

nmap -p 1858 -sV <host>
sudo nmap -sU -p 1858 <host>
nc -zv <host> 1858

Block it in the firewall

sudo ufw deny 1858/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1858" -Direction Inbound -LocalPort 1858 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1858 used for?

Port 1858 is assigned by IANA to privateark (PrivateArk).

Is port 1858 TCP or UDP?

Port 1858 is registered for TCP and UDP.

Is it safe to open port 1858?

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 1858 is open?

On Linux run "ss -ltnup 'sport = :1858'", on macOS "lsof -nP -i :1858", and on Windows "netstat -ano | findstr :1858" to see the local process. From another machine, "nmap -p 1858 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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