curl --request GET \
  --url https://api.gcore.com/cloud/v1/instances/{project_id}/{region_id}/{instance_id}/ports \
  --header 'Authorization: <api-key>'

{
  "count": 1,
  "results": [
    {
      "id": "ae74714c-c380-48b4-87f8-758d656cdad6",
      "name": "name",
      "security_groups": [
        {
          "id": "4536dba1-93b1-492e-b3df-270b6b9f3650",
          "name": "name1"
        },
        {
          "id": "cee2ca1f-507a-4a31-b714-f6c1ffb4bdfa",
          "name": "name2"
        }
      ]
    }
  ]
}