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// Web

Port 2784: world wide web - development

Port 2784 is assigned by IANA to www-dev (world wide web - development).

2784

How www-dev works

Web
browser:2784www-dev browser:2784www-dev

A browser sends an HTTP request to port 2784 and the www-dev server sends the page back.

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
Web
01 Security

Is port 2784 dangerous?

We have no specific security note for port 2784. Its risk depends on the program actually listening on it. General advice for web services:

  • Serve it over HTTPS only and check the HTTP security headers.
  • Keep admin consoles and development servers off the Internet.
  • Patch the application server and remove default credentials and sample apps.
02 Registry

IANA registry entries for port 2784

ServicePortTransportDescriptionReferenceUpdated
www-dev 2784 TCP, UDP world wide web - development - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2784, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2784'      # process listening on 2784
sudo lsof -nP -i :2784

macOS

sudo lsof -nP -i :2784

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2784 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2784
netstat -ano | findstr :2784

From another machine

nmap -p 2784 -sV <host>
sudo nmap -sU -p 2784 <host>
nc -zv <host> 2784

Block it in the firewall

sudo ufw deny 2784/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2784" -Direction Inbound -LocalPort 2784 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2784 used for?

Port 2784 is assigned by IANA to www-dev (world wide web - development).

Is port 2784 TCP or UDP?

Port 2784 is registered for TCP and UDP.

Is it safe to open port 2784?

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. Serve it over HTTPS only and check the HTTP security headers.

How do I check if port 2784 is open?

On Linux run "ss -ltnup 'sport = :2784'", on macOS "lsof -nP -i :2784", and on Windows "netstat -ano | findstr :2784" to see the local process. From another machine, "nmap -p 2784 <host>" shows whether it is reachable.

05 Related
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk

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