| Package | Description | 
|---|---|
| io.netty.handler.codec.dns | DNS codec information for writing to and reading from a DNS server. | 
| io.netty.resolver.dns | An alternative to Java's built-in domain name lookup mechanism that resolves a domain name asynchronously,
 which supports the queries of an arbitrary DNS record type as well. | 
| Class and Description | 
|---|
| DnsClass Represents a class field in DNS protocol | 
| DnsEntry A class representing entries in a DNS packet (questions, and all resource
 records). | 
| DnsHeader The header super-class which includes information shared by DNS query and
 response packet headers such as the ID, opcode, and type. | 
| DnsMessage The message super-class which contains core information concerning DNS
 packets, both outgoing and incoming. | 
| DnsQuery A DNS query packet which is sent to a server to receive a DNS response packet
 with information answering a DnsQuery's questions. | 
| DnsQueryHeader The DNS query header class which is used to represent the 12 byte header in a
  DnsQuery. | 
| DnsQuestion The DNS question class which represents a question being sent to a server via
 a query, or the question being duplicated and sent back in a response. | 
| DnsResource Represents any resource record (answer, authority, or additional resource
 records). | 
| DnsResponse A DNS response packet which is sent to a client after a server receives a
 query. | 
| DnsResponseCode Represents the possible response codes a server may send after receiving a
 query. | 
| DnsResponseHeader The DNS response header class which is used when receiving data from a DNS
 server. | 
| DnsType Represents a DNS record type. | 
| Class and Description | 
|---|
| DnsQuestion The DNS question class which represents a question being sent to a server via
 a query, or the question being duplicated and sent back in a response. | 
| DnsResponse A DNS response packet which is sent to a client after a server receives a
 query. | 
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