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// Other services

Port 478: spsc

Port 478 is assigned by IANA to spsc (spsc).

478

How spsc works

Other services
client:478spscresponse client:478spscresponse

The client sends a request to port 478 and the spsc 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 478 dangerous?

We have no specific security note for port 478. 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 478

ServicePortTransportDescriptionReferenceUpdated
spsc 478 TCP, UDP spsc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 478, and is it reachable?

Linux

sudo ss -ltnup 'sport = :478'      # process listening on 478
sudo lsof -nP -i :478

macOS

sudo lsof -nP -i :478

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 478 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 478
netstat -ano | findstr :478

From another machine

nmap -p 478 -sV <host>
sudo nmap -sU -p 478 <host>
nc -zv <host> 478

Block it in the firewall

sudo ufw deny 478/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 478" -Direction Inbound -LocalPort 478 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 478 used for?

Port 478 is assigned by IANA to spsc (spsc).

Is port 478 TCP or UDP?

Port 478 is registered for TCP and UDP.

Is it safe to open port 478?

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 478 is open?

On Linux run "ss -ltnup 'sport = :478'", on macOS "lsof -nP -i :478", and on Windows "netstat -ano | findstr :478" to see the local process. From another machine, "nmap -p 478 <host>" shows whether it is reachable.

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