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// Other services

Port 1606: Salutation Manager (SLM-API)

Port 1606 is assigned by IANA to slm-api (Salutation Manager (SLM-API)).

1606

How slm-api works

Other services
client:1606slm-apiresponse client:1606slm-apiresponse

The client sends a request to port 1606 and the slm-api 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 1606 dangerous?

We have no specific security note for port 1606. 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 1606

ServicePortTransportDescriptionReferenceUpdated
slm-api 1606 TCP, UDP Salutation Manager (SLM-API) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1606, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1606'      # process listening on 1606
sudo lsof -nP -i :1606

macOS

sudo lsof -nP -i :1606

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1606 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1606
netstat -ano | findstr :1606

From another machine

nmap -p 1606 -sV <host>
sudo nmap -sU -p 1606 <host>
nc -zv <host> 1606

Block it in the firewall

sudo ufw deny 1606/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1606" -Direction Inbound -LocalPort 1606 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1606 used for?

Port 1606 is assigned by IANA to slm-api (Salutation Manager (SLM-API)).

Is port 1606 TCP or UDP?

Port 1606 is registered for TCP and UDP.

Is it safe to open port 1606?

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 1606 is open?

On Linux run "ss -ltnup 'sport = :1606'", on macOS "lsof -nP -i :1606", and on Windows "netstat -ano | findstr :1606" to see the local process. From another machine, "nmap -p 1606 <host>" shows whether it is reachable.

05 Related
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