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// Other services

Port 1849: ALPHA-SMS

Port 1849 is assigned by IANA to alpha-sms (ALPHA-SMS).

1849

How alpha-sms works

Other services
client:1849alpha-smsresponse client:1849alpha-smsresponse

The client sends a request to port 1849 and the alpha-sms 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 1849 dangerous?

We have no specific security note for port 1849. 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 1849

ServicePortTransportDescriptionReferenceUpdated
alpha-sms 1849 TCP, UDP ALPHA-SMS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1849, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1849'      # process listening on 1849
sudo lsof -nP -i :1849

macOS

sudo lsof -nP -i :1849

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1849 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1849
netstat -ano | findstr :1849

From another machine

nmap -p 1849 -sV <host>
sudo nmap -sU -p 1849 <host>
nc -zv <host> 1849

Block it in the firewall

sudo ufw deny 1849/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1849" -Direction Inbound -LocalPort 1849 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1849 used for?

Port 1849 is assigned by IANA to alpha-sms (ALPHA-SMS).

Is port 1849 TCP or UDP?

Port 1849 is registered for TCP and UDP.

Is it safe to open port 1849?

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 1849 is open?

On Linux run "ss -ltnup 'sport = :1849'", on macOS "lsof -nP -i :1849", and on Windows "netstat -ano | findstr :1849" to see the local process. From another machine, "nmap -p 1849 <host>" shows whether it is reachable.

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