Let's Encrypt - Free SSL/TLS Certificates
Let’s Encrypt is a free, automated, and open certificate authority brought to you by the non-profit <a href="https://www.abetterinternet.org/">Internet Security Research Group (ISRG)</a>.
AS20940 Akamai International B.V.
There are 31 domains that redirect to letsencrypt.org. Here's a sample: