Let’s Encrypt

Connection URIs

• acme://letsencrypt.org - Production server
• acme://letsencrypt.org/staging - Testing server
• acme://letsencrypt.org/v01 - Production server, pinned to API v01

Compatibility

Java 8u101 or later is required for connecting to the Let’s Encrypt servers.

Limits

• Registrations per IP: 10 per 3 hours
• Certificates per Domain: 5 per 7 days
• SANs per Certificate: 100

See here for the current limits.