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// Other services

Port 1561: facilityview

Port 1561 is assigned by IANA to facilityview (facilityview).

1561

How facilityview works

Other services
client:1561facilityviewresponse client:1561facilityviewresponse

The client sends a request to port 1561 and the facilityview 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 1561 dangerous?

We have no specific security note for port 1561. 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 1561

ServicePortTransportDescriptionReferenceUpdated
facilityview 1561 TCP, UDP facilityview - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1561, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1561'      # process listening on 1561
sudo lsof -nP -i :1561

macOS

sudo lsof -nP -i :1561

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1561 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1561
netstat -ano | findstr :1561

From another machine

nmap -p 1561 -sV <host>
sudo nmap -sU -p 1561 <host>
nc -zv <host> 1561

Block it in the firewall

sudo ufw deny 1561/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1561" -Direction Inbound -LocalPort 1561 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1561 used for?

Port 1561 is assigned by IANA to facilityview (facilityview).

Is port 1561 TCP or UDP?

Port 1561 is registered for TCP and UDP.

Is it safe to open port 1561?

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 1561 is open?

On Linux run "ss -ltnup 'sport = :1561'", on macOS "lsof -nP -i :1561", and on Windows "netstat -ano | findstr :1561" to see the local process. From another machine, "nmap -p 1561 <host>" shows whether it is reachable.

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