CyberHunter
Local dataset, no network
// Other services

Port 1822: es-elmd

Port 1822 is assigned by IANA to es-elmd (es-elmd).

1822

How es-elmd works

Other services
client:1822es-elmdresponse client:1822es-elmdresponse

The client sends a request to port 1822 and the es-elmd 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 1822 dangerous?

We have no specific security note for port 1822. 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 1822

ServicePortTransportDescriptionReferenceUpdated
es-elmd 1822 TCP, UDP es-elmd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1822, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1822'      # process listening on 1822
sudo lsof -nP -i :1822

macOS

sudo lsof -nP -i :1822

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1822 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1822
netstat -ano | findstr :1822

From another machine

nmap -p 1822 -sV <host>
sudo nmap -sU -p 1822 <host>
nc -zv <host> 1822

Block it in the firewall

sudo ufw deny 1822/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1822" -Direction Inbound -LocalPort 1822 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1822 used for?

Port 1822 is assigned by IANA to es-elmd (es-elmd).

Is port 1822 TCP or UDP?

Port 1822 is registered for TCP and UDP.

Is it safe to open port 1822?

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 1822 is open?

On Linux run "ss -ltnup 'sport = :1822'", on macOS "lsof -nP -i :1822", and on Windows "netstat -ano | findstr :1822" to see the local process. From another machine, "nmap -p 1822 <host>" shows whether it is reachable.

05 Related
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