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// Network services

Port 3096: Active Print Server Port

Port 3096 is assigned by IANA to ndl-aps (Active Print Server Port).

3096

How ndl-aps works

Network services
client:3096ndl-apsresponse client:3096ndl-apsresponse

The client sends a request to port 3096 and the ndl-aps 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
Network services
01 Security

Is port 3096 dangerous?

We have no specific security note for port 3096. 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 3096

ServicePortTransportDescriptionReferenceUpdated
ndl-aps 3096 TCP, UDP Active Print Server Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3096, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3096'      # process listening on 3096
sudo lsof -nP -i :3096

macOS

sudo lsof -nP -i :3096

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3096 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3096
netstat -ano | findstr :3096

From another machine

nmap -p 3096 -sV <host>
sudo nmap -sU -p 3096 <host>
nc -zv <host> 3096

Block it in the firewall

sudo ufw deny 3096/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3096" -Direction Inbound -LocalPort 3096 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3096 used for?

Port 3096 is assigned by IANA to ndl-aps (Active Print Server Port).

Is port 3096 TCP or UDP?

Port 3096 is registered for TCP and UDP.

Is it safe to open port 3096?

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 3096 is open?

On Linux run "ss -ltnup 'sport = :3096'", on macOS "lsof -nP -i :3096", and on Windows "netstat -ano | findstr :3096" to see the local process. From another machine, "nmap -p 3096 <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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