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// Other services

Port 3428: 2Wire CSS

Port 3428 is assigned by IANA to twcss (2Wire CSS).

3428

How twcss works

Other services
client:3428twcssresponse client:3428twcssresponse

The client sends a request to port 3428 and the twcss 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 3428 dangerous?

We have no specific security note for port 3428. 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 3428

ServicePortTransportDescriptionReferenceUpdated
twcss 3428 TCP, UDP 2Wire CSS - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3428, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3428'      # process listening on 3428
sudo lsof -nP -i :3428

macOS

sudo lsof -nP -i :3428

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3428 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3428
netstat -ano | findstr :3428

From another machine

nmap -p 3428 -sV <host>
sudo nmap -sU -p 3428 <host>
nc -zv <host> 3428

Block it in the firewall

sudo ufw deny 3428/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3428" -Direction Inbound -LocalPort 3428 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3428 used for?

Port 3428 is assigned by IANA to twcss (2Wire CSS).

Is port 3428 TCP or UDP?

Port 3428 is registered for TCP and UDP.

Is it safe to open port 3428?

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 3428 is open?

On Linux run "ss -ltnup 'sport = :3428'", on macOS "lsof -nP -i :3428", and on Windows "netstat -ano | findstr :3428" to see the local process. From another machine, "nmap -p 3428 <host>" shows whether it is reachable.

05 Related
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