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// Other services

Port 618: DEI-ICDA

Port 618 is assigned by IANA to dei-icda (DEI-ICDA).

618

How dei-icda works

Other services
client:618dei-icdaresponse client:618dei-icdaresponse

The client sends a request to port 618 and the dei-icda 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 618 dangerous?

We have no specific security note for port 618. 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 618

ServicePortTransportDescriptionReferenceUpdated
dei-icda 618 TCP, UDP DEI-ICDA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 618, and is it reachable?

Linux

sudo ss -ltnup 'sport = :618'      # process listening on 618
sudo lsof -nP -i :618

macOS

sudo lsof -nP -i :618

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 618 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 618
netstat -ano | findstr :618

From another machine

nmap -p 618 -sV <host>
sudo nmap -sU -p 618 <host>
nc -zv <host> 618

Block it in the firewall

sudo ufw deny 618/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 618" -Direction Inbound -LocalPort 618 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 618 used for?

Port 618 is assigned by IANA to dei-icda (DEI-ICDA).

Is port 618 TCP or UDP?

Port 618 is registered for TCP and UDP.

Is it safe to open port 618?

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 618 is open?

On Linux run "ss -ltnup 'sport = :618'", on macOS "lsof -nP -i :618", and on Windows "netstat -ano | findstr :618" to see the local process. From another machine, "nmap -p 618 <host>" shows whether it is reachable.

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