Lets Encrypt Documentation Get Help Donate About Us Languages lencr.org Last updated: Nov 30,2021 See all Documentation What's lencr . org lencr .org is a domain name owned by Lets Encrypt We use it to host data that is referenced inside the certificates we issue: Why is my computer fetching this data? Is it malicious? No, the data on lencr.org is never malicious. When a device connects to Lencr.org , its because client software on that device (like a web browser or an app) connected to another site, saw a Lets Encrypt certificate, and is trying to verify that its valid: This is routine for many clients. can't speak to whether the other site connected to is malicious. If youre investigating network activity that seems unusual; then you may want to focus on the connection that started just before the connection to lencr.org The pattern of clients' connections to lencr org might look unusual or intermittent. Clients might never retrieve this data; only retrieve subsets of it; or "cache" some data for efficiency, so theyIl only access it sometimes (the time they need it, and when the data may have expired): What exactly is this data for? We being first