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// Other services

Port 2666: extensis

Port 2666 is assigned by IANA to extensis (extensis).

2666

How extensis works

Other services
client:2666extensisresponse client:2666extensisresponse

The client sends a request to port 2666 and the extensis 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 2666 dangerous?

We have no specific security note for port 2666. 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 2666

ServicePortTransportDescriptionReferenceUpdated
extensis 2666 TCP, UDP extensis - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2666, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2666'      # process listening on 2666
sudo lsof -nP -i :2666

macOS

sudo lsof -nP -i :2666

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2666 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2666
netstat -ano | findstr :2666

From another machine

nmap -p 2666 -sV <host>
sudo nmap -sU -p 2666 <host>
nc -zv <host> 2666

Block it in the firewall

sudo ufw deny 2666/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2666" -Direction Inbound -LocalPort 2666 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2666 used for?

Port 2666 is assigned by IANA to extensis (extensis).

Is port 2666 TCP or UDP?

Port 2666 is registered for TCP and UDP.

Is it safe to open port 2666?

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 2666 is open?

On Linux run "ss -ltnup 'sport = :2666'", on macOS "lsof -nP -i :2666", and on Windows "netstat -ano | findstr :2666" to see the local process. From another machine, "nmap -p 2666 <host>" shows whether it is reachable.

05 Related
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