Symptom
- *.domain.com IN A 1.2.3.4 "A" record exists in domain.com zone
- example.domain.com doesn't resolve in DNS unless example.domain.com is added as a record
Steps to Test
Check if a Hostname is an Empty Non-Terminal
Root Cause
example.domain.com is an empty non-terminal
Steps to Resolution
Add a resource record (such as an "A" record or a CNAME) for example.domain.com.
Additional Information
Assuming example.domain.com is an empty non-terminal, if you want subdomains of example.domain.com to resolve via wildcard, you need to add a resource record (such as "A" record or CNAME) for *.example.domain.com because *.domain.com won't answer for wildcardexample.example.domain.com