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Ubuntu - Networking - DNS - Check DNS Cache

systemd-resolve --statistics

returns:

DNSSEC supported by current servers: no
 
Transactions              
Current Transactions: 0   
  Total Transactions: 1163
 
Cache                     
  Current Cache Size: 33  
          Cache Hits: 879 
        Cache Misses: 284 
 
DNSSEC Verdicts           
              Secure: 0   
            Insecure: 0   
               Bogus: 0   
       Indeterminate: 0

NOTE: The Current Cache Size is the value you're looking for.

If it's 0, you just flushed the DNS cache.