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// Other services

Port 1787: funk-license

Port 1787 is assigned by IANA to funk-license (funk-license).

1787

How funk-license works

Other services
client:1787funk-licenseresponse client:1787funk-licenseresponse

The client sends a request to port 1787 and the funk-license 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 1787 dangerous?

We have no specific security note for port 1787. 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 1787

ServicePortTransportDescriptionReferenceUpdated
funk-license 1787 TCP, UDP funk-license - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1787, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1787'      # process listening on 1787
sudo lsof -nP -i :1787

macOS

sudo lsof -nP -i :1787

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1787 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1787
netstat -ano | findstr :1787

From another machine

nmap -p 1787 -sV <host>
sudo nmap -sU -p 1787 <host>
nc -zv <host> 1787

Block it in the firewall

sudo ufw deny 1787/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1787" -Direction Inbound -LocalPort 1787 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1787 used for?

Port 1787 is assigned by IANA to funk-license (funk-license).

Is port 1787 TCP or UDP?

Port 1787 is registered for TCP and UDP.

Is it safe to open port 1787?

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 1787 is open?

On Linux run "ss -ltnup 'sport = :1787'", on macOS "lsof -nP -i :1787", and on Windows "netstat -ano | findstr :1787" to see the local process. From another machine, "nmap -p 1787 <host>" shows whether it is reachable.

05 Related
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