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// Other services

Port 496: PIM-RP-DISC

Port 496 is assigned by IANA to pim-rp-disc (PIM-RP-DISC).

496

How pim-rp-disc works

Other services
client:496pim-rp-discresponse client:496pim-rp-discresponse

The client sends a request to port 496 and the pim-rp-disc 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 496 dangerous?

We have no specific security note for port 496. 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 496

ServicePortTransportDescriptionReferenceUpdated
pim-rp-disc 496 TCP, UDP PIM-RP-DISC - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 496, and is it reachable?

Linux

sudo ss -ltnup 'sport = :496'      # process listening on 496
sudo lsof -nP -i :496

macOS

sudo lsof -nP -i :496

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 496 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 496
netstat -ano | findstr :496

From another machine

nmap -p 496 -sV <host>
sudo nmap -sU -p 496 <host>
nc -zv <host> 496

Block it in the firewall

sudo ufw deny 496/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 496" -Direction Inbound -LocalPort 496 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 496 used for?

Port 496 is assigned by IANA to pim-rp-disc (PIM-RP-DISC).

Is port 496 TCP or UDP?

Port 496 is registered for TCP and UDP.

Is it safe to open port 496?

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 496 is open?

On Linux run "ss -ltnup 'sport = :496'", on macOS "lsof -nP -i :496", and on Windows "netstat -ano | findstr :496" to see the local process. From another machine, "nmap -p 496 <host>" shows whether it is reachable.

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