Let's Encrypt Application

The following page provides details on domains, networks, IPs, hosting services, and content delivery networks used by Let's Encrypt.

Description

Let's Encrypt - Logo

Let’s Encrypt is a free, automated, and open certificate authority brought to you by the non-profit Internet Security Research Group (ISRG).

Category Technology
Web Link Let's Encrypt - Home Page

Application Domains

The application domains data shown here is available in our Netify Data Feeds solution. The data is accessible via our IP API as well as downloadable datasets.

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Domains

Primary Domains

Primary Domains are owned and managed by the application vendor.

Platform Domains are often provided by hosting providers, content delivery networks, SaaS platforms and other third parties. It is important to identify these domains for DNS filters and hostname blocklists.

Core Networks

Applications are sometimes deployed on partner networks, parent company networks, or regional hosting providers. The following is a sample of Let's Encrypt IP addresses deployed on this type of network.

Other Networks

There are tens of thousands of Internet network providers and we make an effort to track as many as we can, but we have less coverage for niche and local providers. The following is a sample of Let's Encrypt IP addresses on this type of network.

SaaS - Software-as-a-Service

Applications often use various third party platforms for providing authentication, advertising, cybersecurity, e-mail services and more. The Software-as-a-Service (SaaS) platforms used by Let's Encrypt are summarized below.

SaaS # of IPs
Logo Discourse 2

Hosting

Cloud hosting vendors like AWS and Microsoft Azure provide cloud-based computing and network resources to deliver applications. The hosting platforms used by Let's Encrypt are summarized below by geographical points-of-presence (PoP). Each PoP can host many IPs to deliver an application.

Content Delivery Networks - CDNs

In order to get information to end users more quickly, many applications are distributed from multiple geographical points-of-presence (PoPs) using Content Delivery Networks (CDNs). Each PoP can host many IPs to deliver an application. A sample IP is provided.

Take special note of CDNs that use Anycast technology. Anycast makes it possible to route a single IP address to a variety of different geographic locations. In other words, one global Anycast IP is hosted in multiple geographic locations.

CDNs # of IPs
Logo Akamai 7413
Logo Cloudflare 5
Logo Amazon CloudFront 4170

Anycast

PoP Locations

CDN PoP Locations

Other Locations

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