Upcoming Features

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For announcements of upcoming changes, please see the API Announcements category on the Let’s Encrypt community forum.

Completed Features

ECDSA Root and Intermediates

  • Enabled: June 06, 2024

We are issuing certificates from our production ECDSA intermediates to ECDSA leaf certificates. See the Chains of Trust documentation for full details on our PKI hierarchy.

ACME Renewal Information (ARI)

  • Enabled: March 23, 2023

We now run ARI, a system that allows us to notify subscribers via API when they need to renew.

Multi-Perspective Validation

  • Enabled: February 19, 2020

We now validate domain control from multiple network perspectives.

Certificate Transparency Log

  • Enabled: May 15, 2019

We now operate a Certificate Transparency log.

TLS ALPN Challenge Support

  • Enabled: July 12, 2018

We’ve specified and implemented a replacement for the TLS-SNI validation method, which was discontinued for security reasons. Introducing a replacement was important for subscribers who only want to use port 443 for validation.

Wildcard Certificates

  • Enabled: March 13, 2018


  • Enabled: March 13, 2018

Full IPv6 Support

  • Enabled: July 26, 2016