About Source CIDR

What this is

Source CIDR is a curated registry of official IP range publications, ASN context, and verification guidance for crawlers, AI platforms, CDNs, cloud providers, and developer tools.

We link to vendor-published feeds and documentation where they exist. We do not scrape, guess, or reverse-engineer IP ranges from BGP dumps - if a vendor publishes a JSON, TXT, or CSV of their addresses, we point to it.

For a visual companion, see the Cloud & CDN infrastructure map — regions and edge PoPs across major providers.

How entries are categorized

Official

IP ranges sourced directly from the vendor's published feed (JSON, TXT, CSV, or API endpoint).

Maintained

Ranges aggregated, deduplicated, or mirrored here on Source CIDR when no single vendor feed exists.

ASN

Autonomous System Numbers associated with a company - useful as BGP context but not a substitute for IP-level allowlists.

What this is not

This registry is a reference tool, not an authentication service. Listing an IP range here does not guarantee that traffic from that range is legitimate. Always cross-check official sources, use rDNS verification where documented, and validate webhook signatures rather than relying on IP allowlists alone.

Data licensing

IP range data linked from this registry is published by each vendor under their own terms. Source CIDR pages are provided for reference; use each entry's official source for authoritative licensing and use conditions.

For brand marks and trademarks shown on the site, see the brand marks page.

Open source

Source CIDR is currently maintained manually. The plan is to open-source the project (or at least the data layer) so that companies and individuals can submit their own CIDR lists, ASNs, and feed URLs directly via pull requests - rather than relying on one person to discover and add every entry.

If you represent an organization and want your IP ranges listed here, or if you'd like to contribute when the repo opens up, reach out and we'll keep you in the loop.

Contact

Built and maintained by Divyendra Patil. Corrections, additions, or questions: hello@divyendra.com.