Checks if a domain name is free for registration.
Note: This function is not available for sub users.
| Name | Data Type | Status | Description |
| auth-id | Integer | Required | Authentication parameter |
| auth-password | String | Required | Authentication parameter |
| name | String | Required | Name of the domain |
| tld | Array | Required | TLD of the domain |
URL JSON: https://api.cloudns.net/domains/check-available.json
POST/GET: auth-id=0&auth-password=password&name=domain&tld[]=com&tld[]=net
URL XML: https://api.cloudns.net/domains/check-available.xml
POST/GET: auth-id=0&auth-password=password&name=domain&tld[]=com&tld[]=net