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// Other services

Port 1733: SIMS - SIIPAT Protocol for Alarm Transmission

Port 1733 is assigned by IANA to siipat (SIMS - SIIPAT Protocol for Alarm Transmission).

1733

How siipat works

Other services
client:1733siipatresponse client:1733siipatresponse

The client sends a request to port 1733 and the siipat 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 1733 dangerous?

We have no specific security note for port 1733. 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 1733

ServicePortTransportDescriptionReferenceUpdated
siipat 1733 TCP, UDP SIMS - SIIPAT Protocol for Alarm Transmission - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1733, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1733'      # process listening on 1733
sudo lsof -nP -i :1733

macOS

sudo lsof -nP -i :1733

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1733 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1733
netstat -ano | findstr :1733

From another machine

nmap -p 1733 -sV <host>
sudo nmap -sU -p 1733 <host>
nc -zv <host> 1733

Block it in the firewall

sudo ufw deny 1733/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1733" -Direction Inbound -LocalPort 1733 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1733 used for?

Port 1733 is assigned by IANA to siipat (SIMS - SIIPAT Protocol for Alarm Transmission).

Is port 1733 TCP or UDP?

Port 1733 is registered for TCP and UDP.

Is it safe to open port 1733?

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 1733 is open?

On Linux run "ss -ltnup 'sport = :1733'", on macOS "lsof -nP -i :1733", and on Windows "netstat -ano | findstr :1733" to see the local process. From another machine, "nmap -p 1733 <host>" shows whether it is reachable.

05 Related
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