- Login to https://portal.ultradns.com
- Click Domains
- Search for *.domain.com
- Verify that there is a record of any type for *.domain.com
- Search for example.domain.com
- If any records contain 'example.domain.com' and are not exactly example.domain.com, then example.domain.com is an empty non-terminal and requires a specific (not wildcard) record in order to resolve
- If no records contain 'example.domain.com' then it is not an empty non-terminal
Additional Information
For more information on empty non-terminals, please see this RFC.
Insight into Step 5-1
For example, if there is a record that has qa.example.domain.com that contains example.domain.com in the hostname, qa.example.domain.com contains example.domain.com.