CyberHunter
Local dataset, no network
// Other services

Port 1623: jaleosnd

Port 1623 is assigned by IANA to jaleosnd (jaleosnd).

1623

How jaleosnd works

Other services
client:1623jaleosndresponse client:1623jaleosndresponse

The client sends a request to port 1623 and the jaleosnd 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 1623 dangerous?

We have no specific security note for port 1623. 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 1623

ServicePortTransportDescriptionReferenceUpdated
jaleosnd 1623 TCP, UDP jaleosnd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1623, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1623'      # process listening on 1623
sudo lsof -nP -i :1623

macOS

sudo lsof -nP -i :1623

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1623 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1623
netstat -ano | findstr :1623

From another machine

nmap -p 1623 -sV <host>
sudo nmap -sU -p 1623 <host>
nc -zv <host> 1623

Block it in the firewall

sudo ufw deny 1623/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1623" -Direction Inbound -LocalPort 1623 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1623 used for?

Port 1623 is assigned by IANA to jaleosnd (jaleosnd).

Is port 1623 TCP or UDP?

Port 1623 is registered for TCP and UDP.

Is it safe to open port 1623?

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 1623 is open?

On Linux run "ss -ltnup 'sport = :1623'", on macOS "lsof -nP -i :1623", and on Windows "netstat -ano | findstr :1623" to see the local process. From another machine, "nmap -p 1623 <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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