https://openjdk.java.net/ 
public interface sun.net.spi.nameservice.NameService
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.net.spi.nameservice.NameService
  super_class: java.lang.Object
{
  public abstract java.net.InetAddress[] lookupAllHostAddr(java.lang.String);
    descriptor: (Ljava/lang/String;)[Ljava/net/InetAddress;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.net.UnknownHostException
    MethodParameters:
      Name  Flags
      host  

  public abstract java.lang.String getHostByAddr(byte[]);
    descriptor: ([B)Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.net.UnknownHostException
    MethodParameters:
      Name  Flags
      addr  
}
SourceFile: "NameService.java"