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// Other services

Port 16001: Administration Server Connector

Port 16001 is assigned by IANA to fmsascon (Administration Server Connector).

16001

How fmsascon works

Other services
client:16001fmsasconresponse client:16001fmsasconresponse

The client sends a request to port 16001 and the fmsascon 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 16001 dangerous?

We have no specific security note for port 16001. 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 16001

ServicePortTransportDescriptionReferenceUpdated
fmsascon 16001 TCP Administration Server Connector - 2010-10-06
-16001-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 16001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16001'      # process listening on 16001
sudo lsof -nP -i :16001

macOS

sudo lsof -nP -i :16001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16001
netstat -ano | findstr :16001

From another machine

nmap -p 16001 -sV <host>
nc -zv <host> 16001

Block it in the firewall

sudo ufw deny 16001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16001" -Direction Inbound -LocalPort 16001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16001 used for?

Port 16001 is assigned by IANA to fmsascon (Administration Server Connector).

Is port 16001 TCP or UDP?

Port 16001 is registered for TCP.

Is it safe to open port 16001?

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 16001 is open?

On Linux run "ss -ltnup 'sport = :16001'", on macOS "lsof -nP -i :16001", and on Windows "netstat -ano | findstr :16001" to see the local process. From another machine, "nmap -p 16001 <host>" shows whether it is reachable.

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