CyberHunter
Local dataset, no network
// Other services

Port 3365: Content Server

Port 3365 is assigned by IANA to contentserver (Content Server).

3365

How contentserver works

Other services
client:3365contentserverresponse client:3365contentserverresponse

The client sends a request to port 3365 and the contentserver 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 3365 dangerous?

We have no specific security note for port 3365. 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 3365

ServicePortTransportDescriptionReferenceUpdated
contentserver 3365 TCP, UDP Content Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3365, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3365'      # process listening on 3365
sudo lsof -nP -i :3365

macOS

sudo lsof -nP -i :3365

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3365 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3365
netstat -ano | findstr :3365

From another machine

nmap -p 3365 -sV <host>
sudo nmap -sU -p 3365 <host>
nc -zv <host> 3365

Block it in the firewall

sudo ufw deny 3365/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3365" -Direction Inbound -LocalPort 3365 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3365 used for?

Port 3365 is assigned by IANA to contentserver (Content Server).

Is port 3365 TCP or UDP?

Port 3365 is registered for TCP and UDP.

Is it safe to open port 3365?

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 3365 is open?

On Linux run "ss -ltnup 'sport = :3365'", on macOS "lsof -nP -i :3365", and on Windows "netstat -ano | findstr :3365" to see the local process. From another machine, "nmap -p 3365 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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