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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/net/spi/InetAddressResolver.html below:

InetAddressResolver (Java SE 21 & JDK 21)

public interface InetAddressResolver

Since:

18

• Nested Class Summary

  Nested Classes

  static final class 

  A LookupPolicy object describes characteristics that can be applied to a lookup operation.

• Method Summary

  Lookup the host name corresponding to the raw IP address provided.

  Given the name of a host, returns a stream of IP addresses of the requested address family associated with a provided hostname.

• Method Details
  • lookupByName

    Given the name of a host, returns a stream of IP addresses of the requested address family associated with a provided hostname.

    host should be a machine name, such as "www.example.com", not a textual representation of its IP address. No validation is performed on the given host name: if a textual representation is supplied, the name resolution is likely to fail and UnknownHostException may be thrown.

    The address family type and addresses order are specified by the LookupPolicy instance. Lookup operation characteristics could be acquired with InetAddressResolver.LookupPolicy.characteristics(). If InetAddressResolver.LookupPolicy.IPV4 and InetAddressResolver.LookupPolicy.IPV6 characteristics provided then this method returns addresses of both IPV4 and IPV6 families.

    Parameters:

    host - the specified hostname

    lookupPolicy - the address lookup policy

    Returns:

    a stream of IP addresses for the requested host

    Throws:

    NullPointerException - if either parameter is null

    UnknownHostException - if no IP address for the host could be found

    See Also:

    • InetAddressResolver.LookupPolicy

  • lookupByAddress

    Lookup the host name corresponding to the raw IP address provided.

    addr argument is in network byte order: the highest order byte of the address is in addr[0].

    IPv4 address byte array must be 4 bytes long and IPv6 byte array must be 16 bytes long.

    Parameters:

    addr - byte array representing a raw IP address

    Returns:

    String representing the host name mapping

    Throws:

    UnknownHostException - if no host name is found for the specified IP address

    IllegalArgumentException - if the length of the provided byte array doesn't correspond to a valid IP address length

    NullPointerException - if addr is null

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