diff --git a/Sources/HTTPStatusCodes+Extensions.swift b/Sources/HTTPStatusCodes+Extensions.swift
index 246602f..b79a44b 100644
--- a/Sources/HTTPStatusCodes+Extensions.swift
+++ b/Sources/HTTPStatusCodes+Extensions.swift
@@ -29,6 +29,10 @@ public extension HTTPStatusCode {
     var isServerError: Bool {
         return isIn(range: 500...599)
     }
+    /// Cloudflare Error - a dedicated Cloudflare status code was returned.
+    var isCloudflareError: Bool {
+        return isIn(range: 520...526)
+    }
     
     /// - returns: `true` if the status code is in the provided range, false otherwise.
     private func isIn(range: ClosedRange<HTTPStatusCode.RawValue>) -> Bool {
diff --git a/Sources/HTTPStatusCodes.swift b/Sources/HTTPStatusCodes.swift
index 1178e14..09bf330 100644
--- a/Sources/HTTPStatusCodes.swift
+++ b/Sources/HTTPStatusCodes.swift
@@ -406,6 +406,55 @@ import Foundation
     /// 
     /// - seealso: [RFC6585](http://www.iana.org/go/rfc6585)
     case networkAuthenticationRequired = 511
+
+    /// Web Server Returned Unknown Error: 520
+    ///
+    /// The origin server returned an empty, unknown, or unexpected response to Cloudflare.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case webServerReturnedUnknownError = 520
+
+    /// Web Server Is Down: 521
+    ///
+    /// The origin server refused connections from Cloudflare. Security solutions at the origin may be blocking legitimate connections from certain Cloudflare IP addresses.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case webServerIsDown = 521
+
+    /// Connection Timed Out: 522
+    ///
+    /// Cloudflare timed out contacting the origin server.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case connectionTimedOut = 522
+
+    /// Origin Is Unreachable: 523
+    ///
+    /// Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect or missing.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case originIsUnreacahable = 523
+
+    /// A Timeout Occurred: 524
+    ///
+    /// Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case timeoutOccurred = 524
+
+    /// SSL Handshake Failed: 525
+    ///
+    /// Cloudflare could not negotiate a SSL/TLS handshake with the origin server.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case sslHandshakeFailed = 525
+
+    /// Invalid SSL Certificate: 526
+    ///
+    /// Cloudflare could not validate the SSL certificate on the origin web server. Also used by Cloud Foundry's gorouter.
+    ///
+    /// - seealso: [Cloudflare Help](https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
+    case invalidSSLCertificate = 526
     
     /// Site is frozen: 530
     ///