What is the commonly used port number for HTTPS?

The commonly used port number for HTTPS (Hypertext Transfer Protocol Secure) is 443. This port number is designated for secure communication over a computer network, particularly the Internet. When a web browser makes a request to a secure server using HTTPS, it defaults to port 443 unless specified otherwise.

HTTPS is essential for establishing encrypted connections, ensuring the confidentiality and integrity of data transmitted between clients and servers. This is especially important for protecting sensitive information, such as login credentials and financial transactions.

Understanding the differences between port numbers is crucial for networking and security tasks. For instance, port 80 is used for unencrypted HTTP traffic, while port 25 is typically utilized for SMTP (Simple Mail Transfer Protocol), which handles email transmission. Port 1500 does not have any standard application associated with it in common networking practices, making its relevance in this context negligible. Knowing these distinctions helps in configuring firewalls and network policies effectively.