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// Other services

Port 4753: Simple Invocation of Methods Over Network (SIMON)

Port 4753 is assigned by IANA to simon (Simple Invocation of Methods Over Network (SIMON)), simon-disc (Simple Invocation of Methods Over Network (SIMON) Discovery).

4753

How simon works

Other services
client:4753simonresponse client:4753simonresponse

The client sends a request to port 4753 and the simon service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4753 dangerous?

We have no specific security note for port 4753. 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 4753

ServicePortTransportDescriptionReferenceUpdated
simon 4753 TCP Simple Invocation of Methods Over Network (SIMON) - 2012-04-19
simon-disc 4753 UDP Simple Invocation of Methods Over Network (SIMON) Discovery - 2012-04-19

// source: IANA service name and port number registry

03 Check it

Which program uses port 4753, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4753'      # process listening on 4753
sudo lsof -nP -i :4753

macOS

sudo lsof -nP -i :4753

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4753 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4753
netstat -ano | findstr :4753

From another machine

nmap -p 4753 -sV <host>
sudo nmap -sU -p 4753 <host>
nc -zv <host> 4753

Block it in the firewall

sudo ufw deny 4753/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4753" -Direction Inbound -LocalPort 4753 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4753 used for?

Port 4753 is assigned by IANA to simon (Simple Invocation of Methods Over Network (SIMON)), simon-disc (Simple Invocation of Methods Over Network (SIMON) Discovery).

Is port 4753 TCP or UDP?

Port 4753 is registered for TCP and UDP.

Is it safe to open port 4753?

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 4753 is open?

On Linux run "ss -ltnup 'sport = :4753'", on macOS "lsof -nP -i :4753", and on Windows "netstat -ano | findstr :4753" to see the local process. From another machine, "nmap -p 4753 <host>" shows whether it is reachable.

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