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// Other services

Port 3310: Dyna Access

Port 3310 is assigned by IANA to dyna-access (Dyna Access).

3310

How dyna-access works

Other services
client:3310dyna-accessresponse client:3310dyna-accessresponse

The client sends a request to port 3310 and the dyna-access 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 3310 dangerous?

We have no specific security note for port 3310. 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 3310

ServicePortTransportDescriptionReferenceUpdated
dyna-access 3310 TCP, UDP Dyna Access - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3310, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3310'      # process listening on 3310
sudo lsof -nP -i :3310

macOS

sudo lsof -nP -i :3310

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3310 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3310
netstat -ano | findstr :3310

From another machine

nmap -p 3310 -sV <host>
sudo nmap -sU -p 3310 <host>
nc -zv <host> 3310

Block it in the firewall

sudo ufw deny 3310/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3310" -Direction Inbound -LocalPort 3310 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3310 used for?

Port 3310 is assigned by IANA to dyna-access (Dyna Access).

Is port 3310 TCP or UDP?

Port 3310 is registered for TCP and UDP.

Is it safe to open port 3310?

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 3310 is open?

On Linux run "ss -ltnup 'sport = :3310'", on macOS "lsof -nP -i :3310", and on Windows "netstat -ano | findstr :3310" to see the local process. From another machine, "nmap -p 3310 <host>" shows whether it is reachable.

05 Related
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