What is port 80 used for?
Port 80 is HTTP, the protocol web browsers and servers speak, without encryption. A URL that starts with http:// and names no port goes to port 80.
Very few sites serve real content on port 80 any more. It is kept open to answer visitors who typed a bare address and redirect them to HTTPS on 443; the site can then tell browsers to skip port 80 in future with an HSTS header. Anything that does travel over port 80 can be read and altered on the way, which matters on shared Wi-Fi. On internal networks port 80 often turns up on printers, cameras and device admin pages, a common audit finding.
Is port 80 TCP or UDP?
TCP. HTTP/1.1 and HTTP/2 run over TCP, and 80 is the default TCP port for the http scheme. The UDP-based HTTP/3 is used with HTTPS on port 443, not on port 80.
What is the secure alternative to port 80?
HTTPS on port 443, which is HTTP inside a TLS connection. The usual setup keeps port 80 open only to redirect to 443, and sends an HSTS header so that browsers go straight to HTTPS next time.
Port 80 vs port 8080: what is the difference?
Port 80 is the standard HTTP port. Port 8080 is a registered alternate for HTTP, commonly used by proxies, test servers and device admin pages, and it has to be typed in the URL. Neither is encrypted.
Which CompTIA exams list port 80?
CompTIA lists port 80 by number in both the Network+ and the A+ Core 1 objectives.
- Network+ N10-009: objective 1.4 (Networking Concepts), listed as “Hypertext Transfer Protocol (HTTP), 80”.
- A+ Core 1 220-1201: objective 2.1 (Networking), listed as “80, Hypertext Transfer Protocol (HTTP)”.
The quoted text is how the objectives document lists the port. The exam puts the port in a scenario, such as a firewall rule or a failed connection; it does not only ask for the number.
Check yourself: a practice question
Written by CertSprint for this page. It is not taken from any exam.
A web server should be reachable only over encrypted connections, but users who type the bare domain name must still arrive. How should port 80 be handled?
- Keep it open only to redirect to HTTPS on 443
- Close 443 and serve everything on 80
- Move the site to port 23
- Block both 80 and 443
Show the answer
A. Keep it open only to redirect to HTTPS on 443. A redirect on 80 catches plain requests and sends them to 443. Closing 80 entirely makes typed addresses fail for first-time visitors.
Sources: IANA Service Name and Transport Protocol Port Number Registry: port 80; RFC 9110: HTTP Semantics; RFC 6797: HTTP Strict Transport Security (HSTS). The port number and how each exam lists it come from CompTIA's exam objectives, linked from the study plans above. The explanation and the question are CertSprint's own, checked against these sources on 12 November 2026.