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Last updated: Aug 3, 2020

IP Addresses in Certificates

We are planning to add support for validating and including IP addresses in certificates.

ECDSA Root and Intermediates

Currently Let’s Encrypt only signs end-entity certificates with RSA intermediates. We now have an ECDSA root and intermediates, but still need to submit them to root programs and integrate them into our issuance system.

Completed Features

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.

Embed SCT receipts in certificates

Enabled: March 29, 2018

Wildcard Certificates

Enabled: March 13, 2018

ACME v2 API

Enabled: March 13, 2018

IDN Support

Enabled: October 20, 2016

Let’s Encrypt now supports issuance for Internationalized Domain Names (IDNs).

Full IPv6 Support

Enabled: July 26, 2016

Initially, only parts of the Let’s Encrypt API infrastructure could communicate via IPv6. This prevented IPv6-only systems from being able to fully interact with Let’s Encrypt. This has been resolved - IPv6 support has been enabled for all functionality.

Windows XP Certificate Compatibility

Enabled: March 25, 2016

Resolved an issue with our certificate chain that prevented Let’s Encrypt certificates from being accepted by browsers on Windows XP.

ECDSA Signing Support

Enabled: February 10, 2016

Added the ability for Let’s Encrypt to sign ECDSA keys with Let’s Encrypt’s RSA intermediates. Support for signing ECDSA keys with a full ECDSA cert chain will be added later.

ACME DNS Challenge Support

Enabled: January 20, 2016

Let’s Encrypt allows validation via DNS records as defined in the ACME specification.