diff --git a/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/cognitiveservices.json b/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/cognitiveservices.json
index 22fe04767512..e79fb409b218 100644
--- a/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/cognitiveservices.json
+++ b/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/cognitiveservices.json
@@ -675,6 +675,49 @@
           }
         }
       }
+    },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.CognitiveServices/locations/{location}/checkDomainAvailability": {
+      "post": {
+        "tags": [
+          "CognitiveServicesAccounts"
+        ],
+        "operationId": "Locations_CheckDomainAvailabilityPost",
+        "description": "Check available SKUs.",
+        "x-ms-examples": {
+          "Check Domain Availability": {
+            "$ref": "./examples/CheckDomainAvailability.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "$ref": "#/parameters/locationParameter"
+          },
+          {
+            "name": "parameters",
+            "in": "body",
+            "required": true,
+            "x-ms-client-flatten": true,
+            "schema": {
+              "$ref": "#/definitions/CheckDomainAvailabilityParameter"
+            },
+            "description": "Check Domain Availability POST body."
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK.",
+            "schema": {
+              "$ref": "#/definitions/CheckDomainAvailabilityResult"
+            }
+          }
+        }
+      }
     }
   },
   "definitions": {
@@ -1130,6 +1173,23 @@
         "type"
       ]
     },
+    "CheckDomainAvailabilityParameter": {
+      "description": "Check Domain availability parameter.",
+      "properties": {
+        "subdomainName": {
+          "type": "string",
+          "description": "The subdomain name to use."
+        },
+        "type": {
+          "type": "string",
+          "description": "The Type of the resource."
+        }
+      },
+      "required": [
+        "subdomainName",
+        "type"
+      ]
+    },
     "CheckSkuAvailabilityResultList": {
       "description": "Check SKU availability result list.",
       "properties": {
@@ -1142,6 +1202,27 @@
         }
       }
     },
+    "CheckDomainAvailabilityResult": {
+      "description": "Check Domain availability result.",
+      "properties": {
+        "isSubdomainAvailable": {
+          "type": "boolean",
+          "description": "Indicates the given SKU is available or not."
+        },
+        "reason": {
+          "type": "string",
+          "description": "Reason why the SKU is not available."
+        },
+        "subdomainName": {
+          "type": "string",
+          "description": "The subdomain name to use."
+        },
+        "type": {
+          "type": "string",
+          "description": "The Type of the resource."
+        }
+      }
+    },
     "CheckSkuAvailabilityResult": {
       "description": "Check SKU availability result.",
       "properties": {
diff --git a/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/examples/CheckDomainAvailability.json b/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/examples/CheckDomainAvailability.json
new file mode 100644
index 000000000000..65fe3be46b54
--- /dev/null
+++ b/specification/cognitiveservices/resource-manager/Microsoft.CognitiveServices/stable/2017-04-18/examples/CheckDomainAvailability.json
@@ -0,0 +1,21 @@
+{
+  "parameters": {
+    "api-version": "2017-04-18",
+    "subscriptionId": "f9b96b36-1f5e-4021-8959-51527e26e6d3",
+    "location": "westus",
+    "parameters": {
+      "subdomainName": "contosodemoapp1",
+      "type": "Microsoft.CognitiveServices/accounts"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "isSubdomainAvailable": false,
+        "reason": "Sub domain name 'contosodemoapp1' is not valid",
+        "subdomainName": "contosodemoapp1",
+        "type": "Microsoft.CognitiveServices/accounts"
+      }
+    }
+  }
+}