SPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

LetsEncrypt

LetsEncrypt Usage Statistics · Download List of All Websites using LetsEncrypt

Let’s Encrypt is a free open Certificate Authority.

Root Authority

HSTS

HSTS Usage Statistics · Download List of All Websites using HSTS

Forces browsers to only communicate with the site using HTTPS.

Common Name Invalid

Common Name Invalid Usage Statistics · Download List of All Websites using Common Name Invalid

The Common Name/SAN value of this websites SSL certificate does not correspond to the domain name.

U.S. Server Location

U.S. Server Location Usage Statistics · Download List of All Websites using U.S. Server Location

The web server is located in the United States.

Server Location

Apache

Apache Usage Statistics · Download List of All Websites using Apache

Apache has been the most popular web server on the Internet since April 1996.

OpenSSL

OpenSSL Usage Statistics · Download List of All Websites using OpenSSL

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

Red Hat Enterprise Linux

Red Hat Enterprise Linux Usage Statistics · Download List of All Websites using Red Hat Enterprise Linux

Red Hat Enterprise Linux (often abbreviated to RHEL) is a Linux distribution produced by Red Hat and targeted toward the commercial market, including mainframes.