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// Other services

Port 5583: T-Mobile SMS Protocol Message 2

Port 5583 is assigned by IANA to tmo-icon-sync (T-Mobile SMS Protocol Message 2).

5583

How tmo-icon-sync works

Other services
client:5583tmo-icon-syncresponse client:5583tmo-icon-syncresponse

The client sends a request to port 5583 and the tmo-icon-sync 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 5583 dangerous?

We have no specific security note for port 5583. 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 5583

ServicePortTransportDescriptionReferenceUpdated
tmo-icon-sync 5583 TCP, UDP T-Mobile SMS Protocol Message 2 - 2008-01-22

// source: IANA service name and port number registry

03 Check it

Which program uses port 5583, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5583'      # process listening on 5583
sudo lsof -nP -i :5583

macOS

sudo lsof -nP -i :5583

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5583 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5583
netstat -ano | findstr :5583

From another machine

nmap -p 5583 -sV <host>
sudo nmap -sU -p 5583 <host>
nc -zv <host> 5583

Block it in the firewall

sudo ufw deny 5583/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5583" -Direction Inbound -LocalPort 5583 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5583 used for?

Port 5583 is assigned by IANA to tmo-icon-sync (T-Mobile SMS Protocol Message 2).

Is port 5583 TCP or UDP?

Port 5583 is registered for TCP and UDP.

Is it safe to open port 5583?

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 5583 is open?

On Linux run "ss -ltnup 'sport = :5583'", on macOS "lsof -nP -i :5583", and on Windows "netstat -ano | findstr :5583" to see the local process. From another machine, "nmap -p 5583 <host>" shows whether it is reachable.

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