====== Ubuntu - Networking - DNS - Check DNS Cache ======

<code bash>
resolvectl statistics

or

systemd-resolve --statistics
</code>

returns:

<code bash>
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   
</code>

<WRAP info>
**NOTE:**  The **Current Cache Size** is the value you're looking for.

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

The cache can store up to 4096 DNS responses for up to 2 hours, so don’t expect to see a massive number listed as the current cache size.

The DNS cache can’t grow to more than 420 kB when used to its fullest; so no concern about memory usage.
</WRAP>