All ports
Port80/UDP
www-httpPort
80
Protocol
UDP
Category
Well-Known
Service
www-http
What is port 80?
Port 80/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the www-http service.
World Wide Web HTTP
Useful commands
nmapnmap -p 80 -sV example.comnetcatnc -zv example.com 80curlcurl -v http://example.com:80/telnettelnet example.com 80bash(echo > /dev/udp/example.com/80) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 80/udpDeny
sudo ufw deny 80/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 80 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 80 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=80/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 80" dir=in action=allow protocol=UDP localport=80Security Risks
- SQL injection and cross-site scripting (XSS)
- Exposure of sensitive data due to lack of encryption
- Denial of service attacks (DoS)
- Directory traversal and exposure of sensitive files
- Brute force attacks against authentication forms
Frequently Asked Questions
What service runs on port 80/UDP?
Port 80/UDP is associated with the www-http service. World Wide Web HTTP
Is it safe to expose port 80 to the Internet?
It depends on the service and configuration. Port 80 (www-http) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 80 is open?
You can use nmap: `nmap -p 80 -sV example.com`, netcat: `nc -zv example.com 80`, or the bash command: `(echo > /dev/udp/example.com/80) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 80 on my firewall?
On Linux with UFW: `sudo ufw allow 80/udp` (open) or `sudo ufw deny 80/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 80 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 80" dir=in action=allow protocol=UDP localport=80`.
What applications and services use port 80?
Port 80/UDP is used by the www-http service. Specific uses depend on the software and configuration. Check our related tools section for more information.