lencr.org - Let's Encrypt
What’s lencr.org? lencr.org is a domain owned by Let’s Encrypt. We use it to host OCSP, CRLs, and issuer certificates: all the URLs that show up in certificates. We used to use longer URLs like http://ocsp.int-x3.letsencrypt.org/. However, when we issued our new root and intermediate certificates, we wanted to make them as small as possible. Every HTTPS connection on the web (billions per day) has to send a copy of a certificate, so every byte matters.