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// Other services

Port 498: siam

Port 498 is assigned by IANA to siam (siam).

498

How siam works

Other services
client:498siamresponse client:498siamresponse

The client sends a request to port 498 and the siam 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 498 dangerous?

We have no specific security note for port 498. 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 498

ServicePortTransportDescriptionReferenceUpdated
siam 498 TCP, UDP siam - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 498, and is it reachable?

Linux

sudo ss -ltnup 'sport = :498'      # process listening on 498
sudo lsof -nP -i :498

macOS

sudo lsof -nP -i :498

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 498 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 498
netstat -ano | findstr :498

From another machine

nmap -p 498 -sV <host>
sudo nmap -sU -p 498 <host>
nc -zv <host> 498

Block it in the firewall

sudo ufw deny 498/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 498" -Direction Inbound -LocalPort 498 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 498 used for?

Port 498 is assigned by IANA to siam (siam).

Is port 498 TCP or UDP?

Port 498 is registered for TCP and UDP.

Is it safe to open port 498?

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 498 is open?

On Linux run "ss -ltnup 'sport = :498'", on macOS "lsof -nP -i :498", and on Windows "netstat -ano | findstr :498" to see the local process. From another machine, "nmap -p 498 <host>" shows whether it is reachable.

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