IsAddrInNetwork checks if an address is contained into any of the networks defined in denyNet Example: allowedNets := []string{"172.17.0.0/16"} addr := "172.17.0.2" returns true.

MsgCleanup prepares the answer to be returned to the client exluding not requested records.

MsgExtractRRByType detects if an answer contains a message type.

https://www.netmeister.org/blog/dns-size.html.

86400.

min ttl for cached msgs.