diff --git a/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/PrivateDnsZone.json b/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/PrivateDnsZone.json
new file mode 100644
index 000000000000..93b5918cf9c7
--- /dev/null
+++ b/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/PrivateDnsZone.json
@@ -0,0 +1,105 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "version": "2021-03-31-privatepreview",
+    "title": "PostgreSQLManagementClient",
+    "description": "The Microsoft Azure management API provides create, read, update, and delete functionality for Azure PostgreSQL resources including servers, databases, firewall rules, VNET rules, security alert policies, log files and configurations with new business model."
+  },
+  "host": "management.azure.com",
+  "schemes": [
+    "https"
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
+  "security": [
+    {
+      "azure_auth": [
+        "user_impersonation"
+      ]
+    }
+  ],
+  "securityDefinitions": {
+    "azure_auth": {
+      "type": "oauth2",
+      "authorizationUrl": "https://login.microsoftonline.com/common/oauth2/authorize",
+      "flow": "implicit",
+      "description": "Azure Active Directory OAuth2 Flow",
+      "scopes": {
+        "user_impersonation": "impersonate your user account"
+      }
+    }
+  },
+  "paths": {
+    "/subscriptions/{subscriptionId}/providers/Microsoft.DBForPostgreSql/getPrivateDnsZoneSuffix": {
+      "post": {
+        "tags": [
+          "GetPrivateDnsZoneSuffix"
+        ],
+        "operationId": "GetPrivateDnsZoneSuffix_Execute",
+        "x-ms-examples": {
+          "GetPrivateDnsZoneSuffix": {
+            "$ref": "./examples/GetPrivateDnsZoneSuffix.json"
+          }
+        },
+        "description": "Get private DNS zone suffix in the cloud",
+        "parameters": [
+          {
+            "$ref": "../../../../../common-types/resource-management/v1/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "../../../../../common-types/resource-management/v1/types.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "in": "body",
+            "name": "body",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "enum": [
+                "PostgreSQL",
+                "PostgreSQLCitus",
+                "MySQL",
+                "MariaDb",
+                "Oracle"
+              ]
+            },
+            "description": "The required parameters for getting private DNS zone suffix based on server type."
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/PrivateDnsZoneSuffix"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "PrivateDnsZoneSuffix": {
+      "type": "string",
+      "description": "Represents a resource name availability."
+    },
+    "CloudError": {
+      "x-ms-external": true,
+      "properties": {
+        "error": {
+          "$ref": "../../../../../common-types/resource-management/v1/types.json#/definitions/ErrorResponse"
+        }
+      },
+      "description": "An error response from the Batch service."
+    }
+  }
+}
diff --git a/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/examples/GetPrivateDnsZoneSuffix.json b/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/examples/GetPrivateDnsZoneSuffix.json
new file mode 100644
index 000000000000..0230cc66fb14
--- /dev/null
+++ b/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/examples/GetPrivateDnsZoneSuffix.json
@@ -0,0 +1,12 @@
+{
+  "parameters": {
+    "api-version": "2021-03-31-privatepreview",
+    "subscriptionId": "ffffffff-ffff-ffff-ffff-ffffffffffff",
+    "body": "PostgreSQL"
+  },
+  "responses": {
+    "200": {
+      "body": "postgres.database.azure.com"
+    }
+  }
+}
diff --git a/specification/postgresql/resource-manager/readme.md b/specification/postgresql/resource-manager/readme.md
index a63f46d98741..c1501d943311 100644
--- a/specification/postgresql/resource-manager/readme.md
+++ b/specification/postgresql/resource-manager/readme.md
@@ -30,6 +30,19 @@ description: The Microsoft Azure management API provides create, read, update, a
 openapi-type: arm
 tag: package-2020-01-01
 ```
+### Tag: package-2021-03-31-privatepreview
+
+These settings apply only when `--tag=package-2021-03-31-privatepreview` is specified on the command line.
+
+``` yaml $(tag) == 'package-2021-03-31-privatepreview'
+input-file:
+- Microsoft.DBforPostgreSQL/preview/2020-02-14-preview/postgresql.json
+- Microsoft.DBforPostgreSQL/preview/2020-11-05-preview/Databases.json
+- Microsoft.DBforPostgreSQL/preview/2021-03-31-privatepreview/PrivateDnsZone.json
+```
+
+
+
 ### Tag: package-2020-11-05-preview
 
 These settings apply only when `--tag=package-2020-11-05-preview` is specified on the command line.