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// Other services

Port 1646: sa-msg-port

Port 1646 is assigned by IANA to sa-msg-port (sa-msg-port).

1646

How sa-msg-port works

Other services
client:1646sa-msg-portresponse client:1646sa-msg-portresponse

The client sends a request to port 1646 and the sa-msg-port 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 1646 dangerous?

We have no specific security note for port 1646. 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 1646

ServicePortTransportDescriptionReferenceUpdated
sa-msg-port 1646 TCP, UDP sa-msg-port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1646, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1646'      # process listening on 1646
sudo lsof -nP -i :1646

macOS

sudo lsof -nP -i :1646

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1646 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1646
netstat -ano | findstr :1646

From another machine

nmap -p 1646 -sV <host>
sudo nmap -sU -p 1646 <host>
nc -zv <host> 1646

Block it in the firewall

sudo ufw deny 1646/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1646" -Direction Inbound -LocalPort 1646 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1646 used for?

Port 1646 is assigned by IANA to sa-msg-port (sa-msg-port).

Is port 1646 TCP or UDP?

Port 1646 is registered for TCP and UDP.

Is it safe to open port 1646?

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 1646 is open?

On Linux run "ss -ltnup 'sport = :1646'", on macOS "lsof -nP -i :1646", and on Windows "netstat -ano | findstr :1646" to see the local process. From another machine, "nmap -p 1646 <host>" shows whether it is reachable.

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