CyberHunter
Local dataset, no network
// Other services

Port 3308: TNS Server

Port 3308 is assigned by IANA to tns-server (TNS Server).

3308

How tns-server works

Other services
client:3308tns-serverresponse client:3308tns-serverresponse

The client sends a request to port 3308 and the tns-server 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 3308 dangerous?

We have no specific security note for port 3308. 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 3308

ServicePortTransportDescriptionReferenceUpdated
tns-server 3308 TCP, UDP TNS Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3308, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3308'      # process listening on 3308
sudo lsof -nP -i :3308

macOS

sudo lsof -nP -i :3308

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3308 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3308
netstat -ano | findstr :3308

From another machine

nmap -p 3308 -sV <host>
sudo nmap -sU -p 3308 <host>
nc -zv <host> 3308

Block it in the firewall

sudo ufw deny 3308/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3308" -Direction Inbound -LocalPort 3308 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3308 used for?

Port 3308 is assigned by IANA to tns-server (TNS Server).

Is port 3308 TCP or UDP?

Port 3308 is registered for TCP and UDP.

Is it safe to open port 3308?

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 3308 is open?

On Linux run "ss -ltnup 'sport = :3308'", on macOS "lsof -nP -i :3308", and on Windows "netstat -ano | findstr :3308" to see the local process. From another machine, "nmap -p 3308 <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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