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// Other services

Port 27876: Astrolink Protocol

Port 27876 is assigned by IANA to astrolink (Astrolink Protocol).

27876

How astrolink works

Other services
client:27876astrolinkresponse client:27876astrolinkresponse

The client sends a request to port 27876 and the astrolink 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 27876 dangerous?

We have no specific security note for port 27876. 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 27876

ServicePortTransportDescriptionReferenceUpdated
astrolink 27876 TCP Astrolink Protocol - 2013-01-14
-27876-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 27876, and is it reachable?

Linux

sudo ss -ltnup 'sport = :27876'      # process listening on 27876
sudo lsof -nP -i :27876

macOS

sudo lsof -nP -i :27876

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 27876 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 27876
netstat -ano | findstr :27876

From another machine

nmap -p 27876 -sV <host>
nc -zv <host> 27876

Block it in the firewall

sudo ufw deny 27876/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 27876" -Direction Inbound -LocalPort 27876 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 27876 used for?

Port 27876 is assigned by IANA to astrolink (Astrolink Protocol).

Is port 27876 TCP or UDP?

Port 27876 is registered for TCP.

Is it safe to open port 27876?

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 27876 is open?

On Linux run "ss -ltnup 'sport = :27876'", on macOS "lsof -nP -i :27876", and on Windows "netstat -ano | findstr :27876" to see the local process. From another machine, "nmap -p 27876 <host>" shows whether it is reachable.

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