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// Web

Port 9204: WAP vCard

Port 9204 is assigned by IANA to wap-vcard (WAP vCard).

9204

How wap-vcard works

Web
browser:9204wap-vcard browser:9204wap-vcard

A browser sends an HTTP request to port 9204 and the wap-vcard 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 9204 dangerous?

We have no specific security note for port 9204. 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 9204

ServicePortTransportDescriptionReferenceUpdated
wap-vcard 9204 TCP, UDP WAP vCard - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9204, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9204'      # process listening on 9204
sudo lsof -nP -i :9204

macOS

sudo lsof -nP -i :9204

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9204 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9204
netstat -ano | findstr :9204

From another machine

nmap -p 9204 -sV <host>
sudo nmap -sU -p 9204 <host>
nc -zv <host> 9204

Block it in the firewall

sudo ufw deny 9204/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9204" -Direction Inbound -LocalPort 9204 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9204 used for?

Port 9204 is assigned by IANA to wap-vcard (WAP vCard).

Is port 9204 TCP or UDP?

Port 9204 is registered for TCP and UDP.

Is it safe to open port 9204?

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 9204 is open?

On Linux run "ss -ltnup 'sport = :9204'", on macOS "lsof -nP -i :9204", and on Windows "netstat -ano | findstr :9204" to see the local process. From another machine, "nmap -p 9204 <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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