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// Other services

Port 5586: Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client

Port 5586 is assigned by IANA to att-mt-sms (Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client).

5586

How att-mt-sms works

Other services
client:5586att-mt-smsresponse client:5586att-mt-smsresponse

The client sends a request to port 5586 and the att-mt-sms service answers.

Transport
TCP
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 5586 dangerous?

We have no specific security note for port 5586. 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 5586

ServicePortTransportDescriptionReferenceUpdated
att-mt-sms 5586 TCP Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client - 2014-08-21
-5586-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5586, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5586'      # process listening on 5586
sudo lsof -nP -i :5586

macOS

sudo lsof -nP -i :5586

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5586 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5586
netstat -ano | findstr :5586

From another machine

nmap -p 5586 -sV <host>
nc -zv <host> 5586

Block it in the firewall

sudo ufw deny 5586/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5586" -Direction Inbound -LocalPort 5586 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5586 used for?

Port 5586 is assigned by IANA to att-mt-sms (Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client).

Is port 5586 TCP or UDP?

Port 5586 is registered for TCP.

Is it safe to open port 5586?

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 5586 is open?

On Linux run "ss -ltnup 'sport = :5586'", on macOS "lsof -nP -i :5586", and on Windows "netstat -ano | findstr :5586" to see the local process. From another machine, "nmap -p 5586 <host>" shows whether it is reachable.

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