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// Other services

Port 8266: ESPeasy peer-2-peer communication

Port 8266 is assigned by IANA to espeasy-p2p (ESPeasy peer-2-peer communication).

8266

How espeasy-p2p works

Other services
client:8266espeasy-p2presponse client:8266espeasy-p2presponse

The client sends a request to port 8266 and the espeasy-p2p service answers.

Transport
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 8266 dangerous?

We have no specific security note for port 8266. 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 8266

ServicePortTransportDescriptionReferenceUpdated
espeasy-p2p 8266 UDP ESPeasy peer-2-peer communication - 2018-11-28
-8266-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8266, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8266'      # process listening on 8266
sudo lsof -nP -i :8266

macOS

sudo lsof -nP -i :8266

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8266 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8266
netstat -ano | findstr :8266

From another machine

nmap -p 8266 -sV <host>
sudo nmap -sU -p 8266 <host>
nc -zv <host> 8266

Block it in the firewall

sudo ufw deny 8266/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8266" -Direction Inbound -LocalPort 8266 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8266 used for?

Port 8266 is assigned by IANA to espeasy-p2p (ESPeasy peer-2-peer communication).

Is port 8266 TCP or UDP?

Port 8266 is registered for UDP.

Is it safe to open port 8266?

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 8266 is open?

On Linux run "ss -ltnup 'sport = :8266'", on macOS "lsof -nP -i :8266", and on Windows "netstat -ano | findstr :8266" to see the local process. From another machine, "nmap -p 8266 <host>" shows whether it is reachable.

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