CyberHunter
Local dataset, no network
// Other services

Port 1865: ENTP

Port 1865 is assigned by IANA to entp (ENTP).

1865

How entp works

Other services
client:1865entpresponse client:1865entpresponse

The client sends a request to port 1865 and the entp 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 1865 dangerous?

We have no specific security note for port 1865. 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 1865

ServicePortTransportDescriptionReferenceUpdated
entp 1865 TCP, UDP ENTP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1865, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1865'      # process listening on 1865
sudo lsof -nP -i :1865

macOS

sudo lsof -nP -i :1865

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1865 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1865
netstat -ano | findstr :1865

From another machine

nmap -p 1865 -sV <host>
sudo nmap -sU -p 1865 <host>
nc -zv <host> 1865

Block it in the firewall

sudo ufw deny 1865/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1865" -Direction Inbound -LocalPort 1865 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1865 used for?

Port 1865 is assigned by IANA to entp (ENTP).

Is port 1865 TCP or UDP?

Port 1865 is registered for TCP and UDP.

Is it safe to open port 1865?

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 1865 is open?

On Linux run "ss -ltnup 'sport = :1865'", on macOS "lsof -nP -i :1865", and on Windows "netstat -ano | findstr :1865" to see the local process. From another machine, "nmap -p 1865 <host>" shows whether it is reachable.

05 Related
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