CyberHunter
Local dataset, no network
// Other services

Port 624: Crypto Admin

Port 624 is assigned by IANA to cryptoadmin (Crypto Admin).

624

How cryptoadmin works

Other services
client:624cryptoadminresponse client:624cryptoadminresponse

The client sends a request to port 624 and the cryptoadmin 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 624 dangerous?

We have no specific security note for port 624. 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 624

ServicePortTransportDescriptionReferenceUpdated
cryptoadmin 624 TCP, UDP Crypto Admin - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 624, and is it reachable?

Linux

sudo ss -ltnup 'sport = :624'      # process listening on 624
sudo lsof -nP -i :624

macOS

sudo lsof -nP -i :624

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 624 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 624
netstat -ano | findstr :624

From another machine

nmap -p 624 -sV <host>
sudo nmap -sU -p 624 <host>
nc -zv <host> 624

Block it in the firewall

sudo ufw deny 624/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 624" -Direction Inbound -LocalPort 624 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 624 used for?

Port 624 is assigned by IANA to cryptoadmin (Crypto Admin).

Is port 624 TCP or UDP?

Port 624 is registered for TCP and UDP.

Is it safe to open port 624?

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 624 is open?

On Linux run "ss -ltnup 'sport = :624'", on macOS "lsof -nP -i :624", and on Windows "netstat -ano | findstr :624" to see the local process. From another machine, "nmap -p 624 <host>" shows whether it is reachable.

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