CyberHunter
Local dataset, no network
// Other services

Port 1826: ARDT

Port 1826 is assigned by IANA to ardt (ARDT).

1826

How ardt works

Other services
client:1826ardtresponse client:1826ardtresponse

The client sends a request to port 1826 and the ardt 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 1826 dangerous?

We have no specific security note for port 1826. 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 1826

ServicePortTransportDescriptionReferenceUpdated
ardt 1826 TCP, UDP ARDT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1826, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1826'      # process listening on 1826
sudo lsof -nP -i :1826

macOS

sudo lsof -nP -i :1826

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1826 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1826
netstat -ano | findstr :1826

From another machine

nmap -p 1826 -sV <host>
sudo nmap -sU -p 1826 <host>
nc -zv <host> 1826

Block it in the firewall

sudo ufw deny 1826/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1826" -Direction Inbound -LocalPort 1826 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1826 used for?

Port 1826 is assigned by IANA to ardt (ARDT).

Is port 1826 TCP or UDP?

Port 1826 is registered for TCP and UDP.

Is it safe to open port 1826?

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 1826 is open?

On Linux run "ss -ltnup 'sport = :1826'", on macOS "lsof -nP -i :1826", and on Windows "netstat -ano | findstr :1826" to see the local process. From another machine, "nmap -p 1826 <host>" shows whether it is reachable.

05 Related
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