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 Internet Security Research Group (ISRG).
18.104.22.168 (27,843 domains)
AS14061 DigitalOcean, LLC
UA-56433935 (1 domains)
There are 39 domains that redirect to letsencrypt.org. Here's a sample: