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// Network services

Port 3396: Printer Agent

Port 3396 is assigned by IANA to printer_agent (Printer Agent), printer-agent (Printer Agent IANA assigned this well-formed service name as a replacement for "printer_agent".).

3396

How printer_agent works

Network services
client:3396printer_agentresponse client:3396printer_agentresponse

The client sends a request to port 3396 and the printer_agent service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 3396 dangerous?

We have no specific security note for port 3396. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 3396

ServicePortTransportDescriptionReferenceUpdated
printer_agent 3396 TCP, UDP Printer Agent - -
printer-agent 3396 TCP, UDP Printer Agent IANA assigned this well-formed service name as a replacement for "printer_agent". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3396, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3396'      # process listening on 3396
sudo lsof -nP -i :3396

macOS

sudo lsof -nP -i :3396

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3396 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3396
netstat -ano | findstr :3396

From another machine

nmap -p 3396 -sV <host>
sudo nmap -sU -p 3396 <host>
nc -zv <host> 3396

Block it in the firewall

sudo ufw deny 3396/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3396" -Direction Inbound -LocalPort 3396 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3396 used for?

Port 3396 is assigned by IANA to printer_agent (Printer Agent), printer-agent (Printer Agent IANA assigned this well-formed service name as a replacement for "printer_agent".).

Is port 3396 TCP or UDP?

Port 3396 is registered for TCP and UDP.

Is it safe to open port 3396?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 3396 is open?

On Linux run "ss -ltnup 'sport = :3396'", on macOS "lsof -nP -i :3396", and on Windows "netstat -ano | findstr :3396" to see the local process. From another machine, "nmap -p 3396 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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