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// Web

Port 4036: WAP Push OTA-HTTP secure

Port 4036 is assigned by IANA to wap-push-https (WAP Push OTA-HTTP secure).

4036

How wap-push-https works

Web
browser:4036wap-push-https browser:4036wap-push-https

A browser sends an HTTP request to port 4036 and the wap-push-https 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 4036 dangerous?

We have no specific security note for port 4036. 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 4036

ServicePortTransportDescriptionReferenceUpdated
wap-push-https 4036 TCP, UDP WAP Push OTA-HTTP secure - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4036, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4036'      # process listening on 4036
sudo lsof -nP -i :4036

macOS

sudo lsof -nP -i :4036

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4036 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4036
netstat -ano | findstr :4036

From another machine

nmap -p 4036 -sV <host>
sudo nmap -sU -p 4036 <host>
nc -zv <host> 4036

Block it in the firewall

sudo ufw deny 4036/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4036" -Direction Inbound -LocalPort 4036 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4036 used for?

Port 4036 is assigned by IANA to wap-push-https (WAP Push OTA-HTTP secure).

Is port 4036 TCP or UDP?

Port 4036 is registered for TCP and UDP.

Is it safe to open port 4036?

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 4036 is open?

On Linux run "ss -ltnup 'sport = :4036'", on macOS "lsof -nP -i :4036", and on Windows "netstat -ano | findstr :4036" to see the local process. From another machine, "nmap -p 4036 <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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