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// Other services

Port 1923: SPICE

Port 1923 is assigned by IANA to spice (SPICE).

1923

How spice works

Other services
client:1923spiceresponse client:1923spiceresponse

The client sends a request to port 1923 and the spice 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 1923 dangerous?

We have no specific security note for port 1923. 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 1923

ServicePortTransportDescriptionReferenceUpdated
spice 1923 TCP, UDP SPICE - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1923, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1923'      # process listening on 1923
sudo lsof -nP -i :1923

macOS

sudo lsof -nP -i :1923

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1923 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1923
netstat -ano | findstr :1923

From another machine

nmap -p 1923 -sV <host>
sudo nmap -sU -p 1923 <host>
nc -zv <host> 1923

Block it in the firewall

sudo ufw deny 1923/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1923" -Direction Inbound -LocalPort 1923 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1923 used for?

Port 1923 is assigned by IANA to spice (SPICE).

Is port 1923 TCP or UDP?

Port 1923 is registered for TCP and UDP.

Is it safe to open port 1923?

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 1923 is open?

On Linux run "ss -ltnup 'sport = :1923'", on macOS "lsof -nP -i :1923", and on Windows "netstat -ano | findstr :1923" to see the local process. From another machine, "nmap -p 1923 <host>" shows whether it is reachable.

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