diff --git a/awscli/botocore/data/endpoints.json b/awscli/botocore/data/endpoints.json
index bae1e8fe16c9..ff6c6a385655 100644
--- a/awscli/botocore/data/endpoints.json
+++ b/awscli/botocore/data/endpoints.json
@@ -2938,6 +2938,7 @@
           "il-central-1" : { },
           "me-central-1" : { },
           "me-south-1" : { },
+          "mx-central-1" : { },
           "sa-east-1" : { },
           "us-east-1" : { },
           "us-east-2" : { },
@@ -23559,39 +23560,150 @@
       },
       "synthetics" : {
         "endpoints" : {
-          "af-south-1" : { },
-          "ap-east-1" : { },
-          "ap-northeast-1" : { },
-          "ap-northeast-2" : { },
-          "ap-northeast-3" : { },
-          "ap-south-1" : { },
-          "ap-south-2" : { },
-          "ap-southeast-1" : { },
-          "ap-southeast-2" : { },
-          "ap-southeast-3" : { },
-          "ap-southeast-4" : { },
-          "ap-southeast-5" : { },
-          "ap-southeast-7" : { },
+          "af-south-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.af-south-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-east-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-east-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-northeast-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-northeast-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-northeast-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-northeast-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-northeast-3" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-northeast-3.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-south-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-south-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-south-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-south-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-3" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-3.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-4" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-4.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-5" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-5.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "ap-southeast-7" : {
+            "variants" : [ {
+              "hostname" : "synthetics.ap-southeast-7.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
           "ca-central-1" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.ca-central-1.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.ca-central-1.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           },
           "ca-west-1" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.ca-west-1.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.ca-west-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-central-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-central-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-central-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-central-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-north-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-north-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-south-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-south-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-south-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-south-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-west-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-west-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-west-2" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-west-2.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "eu-west-3" : {
+            "variants" : [ {
+              "hostname" : "synthetics.eu-west-3.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           },
-          "eu-central-1" : { },
-          "eu-central-2" : { },
-          "eu-north-1" : { },
-          "eu-south-1" : { },
-          "eu-south-2" : { },
-          "eu-west-1" : { },
-          "eu-west-2" : { },
-          "eu-west-3" : { },
           "fips-ca-central-1" : {
             "credentialScope" : {
               "region" : "ca-central-1"
@@ -23634,33 +23746,70 @@
             "deprecated" : true,
             "hostname" : "synthetics-fips.us-west-2.amazonaws.com"
           },
-          "il-central-1" : { },
-          "me-central-1" : { },
-          "me-south-1" : { },
-          "mx-central-1" : { },
-          "sa-east-1" : { },
+          "il-central-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.il-central-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "me-central-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.me-central-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "me-south-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.me-south-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "mx-central-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.mx-central-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "sa-east-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.sa-east-1.api.aws",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
           "us-east-1" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.us-east-1.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.us-east-1.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           },
           "us-east-2" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.us-east-2.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.us-east-2.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           },
           "us-west-1" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.us-west-1.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.us-west-1.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           },
           "us-west-2" : {
             "variants" : [ {
               "hostname" : "synthetics-fips.us-west-2.amazonaws.com",
               "tags" : [ "fips" ]
+            }, {
+              "hostname" : "synthetics.us-west-2.api.aws",
+              "tags" : [ "dualstack" ]
             } ]
           }
         }
@@ -27323,8 +27472,18 @@
       },
       "synthetics" : {
         "endpoints" : {
-          "cn-north-1" : { },
-          "cn-northwest-1" : { }
+          "cn-north-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.cn-north-1.api.amazonwebservices.com.cn",
+              "tags" : [ "dualstack" ]
+            } ]
+          },
+          "cn-northwest-1" : {
+            "variants" : [ {
+              "hostname" : "synthetics.cn-northwest-1.api.amazonwebservices.com.cn",
+              "tags" : [ "dualstack" ]
+            } ]
+          }
         }
       },
       "tagging" : {