The message “The requested URL /apps/dig/ was not found on this server” describes a missing HTTP route. It does not describe the health of the DNS record you wanted to check.

Why the exact message matters

The wording tells you that the server handled the request and rejected the path. In practical terms, the lookup application may have moved, been retired, or temporarily lost its route. You can still test DNS with any tool that sends real DNS queries.

Replacement checks

dig example.com A
dig example.com AAAA
dig example.com CNAME
dig example.com MX
dig example.com TXT

How to explain it to a client or team

Say that the lookup website is unavailable, not that the domain is necessarily broken. Then attach the replacement dig result for the actual domain and record type. That keeps the incident conversation focused on evidence.