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// Network services

Port 3448: Discovery and Net Config

Port 3448 is assigned by IANA to dnc-port (Discovery and Net Config).

3448

How dnc-port works

Network services
client:3448dnc-portresponse client:3448dnc-portresponse

The client sends a request to port 3448 and the dnc-port 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 3448 dangerous?

We have no specific security note for port 3448. 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 3448

ServicePortTransportDescriptionReferenceUpdated
dnc-port 3448 TCP, UDP Discovery and Net Config - 2002-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3448, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3448'      # process listening on 3448
sudo lsof -nP -i :3448

macOS

sudo lsof -nP -i :3448

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3448 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3448
netstat -ano | findstr :3448

From another machine

nmap -p 3448 -sV <host>
sudo nmap -sU -p 3448 <host>
nc -zv <host> 3448

Block it in the firewall

sudo ufw deny 3448/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3448" -Direction Inbound -LocalPort 3448 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3448 used for?

Port 3448 is assigned by IANA to dnc-port (Discovery and Net Config).

Is port 3448 TCP or UDP?

Port 3448 is registered for TCP and UDP.

Is it safe to open port 3448?

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 3448 is open?

On Linux run "ss -ltnup 'sport = :3448'", on macOS "lsof -nP -i :3448", and on Windows "netstat -ano | findstr :3448" to see the local process. From another machine, "nmap -p 3448 <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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