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

{
  "allowed_bm_name_templates": [
    "ed-b9-{ip_octets}"
  ],
  "allowed_name_templates": [
    "ed-c4-{ip_octets}"
  ],
  "custom_name_allowed": false,
  "name_templates_limited": true,
  "allowed_name_win_templates": [
    "ed-b9-{one_ip_octet}"
  ],
  "allowed_bm_name_win_templates": [
    "ed-c4-{two_ip_octets}"
  ]
}