September 1, 2026 SDKs page
Castle now gives you a single place to see how up to date your SDK integrations are. Every SDK release adds new device and behavioral signals that our detection models use. Run the latest version to stay fully protected as attackers change their tools. The SDKs page makes it easy to spot which of yo...
Read about SDKs page August 6, 2026 IP Intelligence API
Over the past months, we shipped residential proxy detection and VPN detection as signals on the Risk API. The data behind those signals is now a product of its own. Instead of sending an event and reading the signals on the response, you can query an IP directly and get the raw intelligence back: -...
Read about IP Intelligence API June 18, 2026 Detect VPN traffic with new IP intelligence
Recently we launched <Anchor label="Residential Proxy detection and richer IP tunnel intelligence" target="blank" href="https://docs.castle.io/changelog/detect-residential-proxies-with-new-ip-intelligence">Residential Proxy detection and richer IP tunnel intelligence</Anchor> . Now we're extending t...
Read about Detect VPN traffic with new IP intelligence June 5, 2026 Export team members to CSV
You can now export your team members list to a CSV file directly from the Team settings page. This is useful for access reviews, compliance audits, or keeping an offline record of who has access to your Castle account. The export includes all visible columns: member since, name, email, user role, 2F...
Read about Export team members to CSV June 2, 2026 New event field: `email.registered_domain`
Castle already provides the event field, reflecting the full domain from the email address. With this release, we're adding , which reduces any subdomain to its registered part using the public suffix list. Fraudulent domains often rotate across subdomains (, , and so on). collapses those to , so...
Read about New event field: `email.registered_domain` May 28, 2026 Detect residential proxies with new IP intelligence
Castle has long provided Proxy IP and Tor IP signals to flag suspicious IP activity. With this release, we're adding a new Residential Proxy IP signal and richer IP tunnel intelligence. Residential proxies route traffic through real consumer ISPs, making them invisible to traditional datacenter-base...
Read about Detect residential proxies with new IP intelligence May 19, 2026 Phone call detection
Castle can now detect when a user is on a phone call during sensitive actions like login or transactions. This helps you catch social engineering attacks, where a scammer calls the victim and walks them through actions while simultaneously taking over their account. Three new fields are available un...
Read about Phone call detection April 1, 2026 CSV export for Lists
Export the entries of any List to CSV. Click Export in the list toolbar and download your data. For larger lists the export runs in the background - you'll receive an email with a download link when it's ready. <Image align="center" border={true} src="https://files.readme.io/210d6d42b6fa79c0790cd8a1...
Read about CSV export for Lists March 19, 2026 IOS SDK 4.0.0 Release
Version 4.0.0 is a major update to the Castle iOS SDK. This release includes several improvements detailed below. Please review the breaking changes below before upgrading. What's new Expanded device signals: Additional device signals collected for broader detection coverage. SDK protection: Adde...
Read about IOS SDK 4.0.0 Release