Upcoming Features

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Last updated:

ECDSA Root and Intermediates

We are issuing certificates from our production ECDSA intermediate to allow-listed accounts. There is no planned date for removing the allow-list.

Completed Features

Multi-Perspective Validation

We now validate domain control from multiple network perspectives.

Certificate Transparency Log

We now operate a Certificate Transparency log.

TLS ALPN Challenge Support

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

Wildcard Certificates


IDN Support

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

Full IPv6 Support

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

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

ECDSA Signing Support

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

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