Update Actions runner IP address section (#17197)

Co-authored-by: Martin Lopes <martin389@github.com>

Author: lucascosti

content/actions/reference/specifications-for-github-hosted-runners.md

@@ -83,44 +83,11 @@ If there is a tool that you'd like to request, please open an issue at [actions/
 
 {% endnote %}
 
-Windows and Ubuntu runners are hosted in Azure and have the same IP address ranges as Azure Data centers. Currently, all Windows and Ubuntu {% data variables.product.prodname_dotcom %}-hosted runners are in the following Azure regions:
-
-- East US (`eastus`)
-- East US 2 (`eastus2`)
-- West US 2 (`westus2`)
-- Central US (`centralus`)
-- South Central US (`southcentralus`)
-
-Microsoft updates the Azure IP address ranges weekly in a JSON file that you can download from the [Azure IP Ranges and Service Tags - Public Cloud](https://www.microsoft.com/en-us/download/details.aspx?id=56519) website. You can use this range of IP addresses if you require an allow-list to prevent unauthorized access to your internal resources.
-
-The JSON file contains an array called `values`. Inside that array, you can find the supported IP addresses in an object with a `name` and `id` of the Azure region, for example `"AzureCloud.eastus2"`.
-
-You can find the supported IP address ranges in the `"addressPrefixes"` object. This is a condensed example of the JSON file.
-
-```json
-{
-  "changeNumber": 84,
-  "cloud": "Public",
-  "values": [
-    {
-      "name": "AzureCloud.eastus2",
-      "id": "AzureCloud.eastus2",
-      "properties": {
-        "changeNumber": 33,
-        "region": "eastus2",
-        "platform": "Azure",
-        "systemService": "",
-        "addressPrefixes": [
-          "13.68.0.0/17",
-          "13.77.64.0/18",
-          "13.104.147.0/25",
-          ...
-        ]
-      }
-    }
-  ]
-}
-```
+Windows and Ubuntu runners are hosted in Azure and subsequently have the same IP address ranges as the Azure datacenters. macOS runners are hosted in {% data variables.product.prodname_dotcom %}'s own macOS cloud.
+
+To get a list of IP address ranges that {% data variables.product.prodname_actions %} uses for {% data variables.product.prodname_dotcom %}-hosted runners, you can use the {% data variables.product.prodname_dotcom %} REST API . For more information, see the `actions` key in the response of the "[Get GitHub meta information](/rest/reference/meta#get-github-meta-information)" endpoint. You can use this list of IP addresses if you require an allow-list to prevent unauthorized access to your internal resources.
+
+The list of {% data variables.product.prodname_actions %} IP addresses returned by the API is updated once a week. 
 
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