Examples of java.net.Inet6Address

java.net.Inet6Address

etf.org/rfc/rfc2373.txt"> RFC 2373: IP Version 6 Addressing Architecture.

Textual representation of IP addresses

Textual representation of IPv6 address used as input to methods takes one of the following forms:

The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the hexadecimal values of the eight 16-bit pieces of the address. This is the full form. For example,

1080:0:0:0:8:800:200C:417A

Note that it is not necessary to write the leading zeros in an individual field. However, there must be at least one numeral in every field, except as described below.
Due to some methods of allocating certain styles of IPv6 addresses, it will be common for addresses to contain long strings of zero bits. In order to make writing addresses containing zero bits easier, a special syntax is available to compress the zeros. The use of "::" indicates multiple groups of 16-bits of zeros. The "::" can only appear once in an address. The "::" can also be used to compress the leading and/or trailing zeros in an address. For example,

1080::8:800:200C:417A
An alternative form that is sometimes more convenient when dealing with a mixed environment of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values of the six high-order 16-bit pieces of the address, and the 'd's are the decimal values of the four low-order 8-bit pieces of the standard IPv4 representation address, for example,

::FFFF:129.144.52.38

::129.144.52.38

where "::FFFF:d.d.d.d" and "::d.d.d.d" are, respectively, the general forms of an IPv4-mapped IPv6 address and an IPv4-compatible IPv6 address. Note that the IPv4 portion must be in the "d.d.d.d" form. The following forms are invalid:

::FFFF:d.d.d

::FFFF:d.d

::d.d.d

::d.d

The following form:

::FFFF:d

is valid, however it is an unconventional representation of the IPv4-compatible IPv6 address,

::255.255.0.d

while "::d" corresponds to the general IPv6 address "0:0:0:0:0:0:0:d".

For methods that return a textual representation as output value, the full form is used. Inet6Address will return the full form because it is unambiguous when used in combination with other textual data.

Special IPv6 address

IPv4-mapped address Of the form::ffff:w.x.y.z, this IPv6 address is used to represent an IPv4 address. It allows the native program to use the same address data structure and also the same socket when communicating with both IPv4 and IPv6 nodes.
In InetAddress and Inet6Address, it is used for internal representation; it has no functional role. Java will never return an IPv4-mapped address. These classes can take an IPv4-mapped address as input, both in byte array and text representation. However, it will be converted into an IPv4 address.

IPv4-mapped address	Of the form::ffff:w.x.y.z, this IPv6 address is used to represent an IPv4 address. It allows the native program to use the same address data structure and also the same socket when communicating with both IPv4 and IPv6 nodes. In InetAddress and Inet6Address, it is used for internal representation; it has no functional role. Java will never return an IPv4-mapped address. These classes can take an IPv4-mapped address as input, both in byte array and text representation. However, it will be converted into an IPv4 address.

Textual representation of IPv6 scoped addresses

The textual representation of IPv6 addresses as described above can be extended to specify IPv6 scoped addresses. This extension to the basic addressing architecture is described in [draft-ietf-ipngwg-scoping-arch-04.txt].

Because link-local and site-local addresses are non-global, it is possible that different hosts may have the same destination address and may be reachable through different interfaces on the same originating system. In this case, the originating system is said to be connected to multiple zones of the same scope. In order to disambiguate which is the intended destination zone, it is possible to append a zone identifier (or scope_id) to an IPv6 address.

The general format for specifying the scope_id is the following:

IPv6-address%scope_id

The IPv6-address is a literal IPv6 address as described above. The scope_id refers to an interface on the local system, and it can be specified in two ways.

As a numeric identifier. This must be a positive integer that identifies the particular interface and scope as understood by the system. Usually, the numeric values can be determined through administration tools on the system. Each interface may have multiple values, one for each scope. If the scope is unspecified, then the default value used is zero.

As a string. This must be the exact string that is returned by {@link java.net.NetworkInterface#getName()} for the particular interface in question. When an Inet6Address is created in this way, the numeric scope-id is determined at the time the object is created by querying the relevant NetworkInterface.

Note also, that the numeric scope_id can be retrieved from Inet6Address instances returned from the NetworkInterface class. This can be used to find out the current scope ids configured on the system. @since 1.4

  /**
   * @tests java.net.Inet6Address#isIPv4CompatibleAddress()
   */
  public void test_isIPv4CompatibleAddress() {
    String addrName = "";
    Inet6Address addr = null;


    try {


      // Tests a number of addresses to see if they are compatable with
      // IPv6 addresses


      addrName = "FFFF::42:42"; // 11111111 = FFFF
      addr = (Inet6Address) InetAddress.getByName(addrName);
      assertTrue("A non-compatable IPv6 address " + addrName
          + " incorrectly identified as a IPv4 compatable address.",
          !addr.isIPv4CompatibleAddress());


      // IPv4-compatible IPv6 address tests
      //
      // Now create 2 IP v6 addresses that are IP v4 compatable
      // to IP v6 addresses.


      addrName = "::0.0.0.0";
      addr = (Inet6Address) InetAddress.getByName(addrName);
      assertTrue("IPv4 compatable address " + addrName
          + " not detected correctly.", addr
          .isIPv4CompatibleAddress());


      addrName = "::255.255.255.255"; // an ipv4 non-multicast address
      addr = (Inet6Address) InetAddress.getByName(addrName);
      assertTrue("IPv4 compatable address " + addrName
          + " not detected correctly.", addr
          .isIPv4CompatibleAddress());


    } catch (Exception e) {
      e.printStackTrace();
      fail("Unknown address : " + addrName);

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  /**
   * @throws UnknownHostException
   * @tests java.net.Inet6Address#getScopeID()
   */
  public void test_getScopeID() throws UnknownHostException {
    Inet6Address v6ia;
    byte[] addr = { (byte) 0xFE, (byte) 0x80, 0, 0, 0, 0, 0, 0, 0x02, 0x11,
        0x25, (byte) 0xFF, (byte) 0xFE, (byte) 0xF8, (byte) 0x7C,
        (byte) 0xB2 };


    v6ia = Inet6Address.getByAddress("123", addr, 3);
    assertEquals(3, v6ia.getScopeId());


    v6ia = Inet6Address.getByAddress("123", addr, 0);
    assertEquals(0, v6ia.getScopeId());


    v6ia = Inet6Address.getByAddress("123", addr, -1);
    assertEquals(0, v6ia.getScopeId());
  }

View Full Code Here

   */
  public void test_getScopedInterface() throws UnknownHostException {
    byte[] addr = { (byte) 0xFE, (byte) 0x80, (byte) 0x09, (byte) 0xb5,
        (byte) 0x6b, (byte) 0xa4, 0, 0, 0, 0, 0, 0, (byte) 0x09,
        (byte) 0xb5, (byte) 0x6b, (byte) 0xa4 };
    Inet6Address v6Addr;
    v6Addr = Inet6Address.getByAddress("123", addr, null);
    assertNull(v6Addr.getScopedInterface());
  }

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      return LOOPBACK4;  // ::1
    } else if (leadingBytesOfZero && (bytes[15] == 0)) {
      return ANY4;  // ::0
    }


    Inet6Address ip6 = (Inet6Address) ip;
    long addressAsLong = 0;
    if (hasEmbeddedIPv4ClientAddress(ip6)) {
      addressAsLong = getEmbeddedIPv4ClientAddress(ip6).hashCode();
    } else {


      // Just extract the high 64 bits (assuming the rest is user-modifiable).
      addressAsLong = ByteBuffer.wrap(ip6.getAddress(), 0, 8).getLong();
    }


    // Many strategies for hashing are possible.  This might suffice for now.
    int coercedHash = Hashing.murmur3_32().hashLong(addressAsLong).asInt();

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      // HORNETQ-907 - strip off IPv6 scope-id (if necessary)
      remoteDestination = new InetSocketAddress(host, port);
      InetAddress inetAddress = ((InetSocketAddress) remoteDestination).getAddress();
      if (inetAddress instanceof Inet6Address)
      {
         Inet6Address inet6Address = (Inet6Address) inetAddress;
         if (inet6Address.getScopeId() != 0)
         {
            try
            {
               remoteDestination = new InetSocketAddress(InetAddress.getByAddress(inet6Address.getAddress()), ((InetSocketAddress) remoteDestination).getPort());
            }
            catch (UnknownHostException e)
            {
               throw new IllegalArgumentException(e.getMessage());
            }

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      // HORNETQ-907 - strip off IPv6 scope-id (if necessary)
      remoteDestination = new InetSocketAddress(host, port);
      InetAddress inetAddress = ((InetSocketAddress) remoteDestination).getAddress();
      if (inetAddress instanceof Inet6Address)
      {
         Inet6Address inet6Address = (Inet6Address) inetAddress;
         if (inet6Address.getScopeId() != 0)
         {
            try
            {
               remoteDestination = new InetSocketAddress(InetAddress.getByAddress(inet6Address.getAddress()), ((InetSocketAddress) remoteDestination).getPort());
            }
            catch (UnknownHostException e)
            {
               throw new IllegalArgumentException(e.getMessage());
            }

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      return LOOPBACK4;  // ::1
    } else if (leadingBytesOfZero && (bytes[15] == 0)) {
      return ANY4;  // ::0
    }


    Inet6Address ip6 = (Inet6Address) ip;
    long addressAsLong = 0;
    if (hasEmbeddedIPv4ClientAddress(ip6)) {
      addressAsLong = getEmbeddedIPv4ClientAddress(ip6).hashCode();
    } else {


      // Just extract the high 64 bits (assuming the rest is user-modifiable).
      addressAsLong = ByteBuffer.wrap(ip6.getAddress(), 0, 8).getLong();
    }


    // Many strategies for hashing are possible.  This might suffice for now.
    int coercedHash = hash64To32(addressAsLong);

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      // HORNETQ-907 - strip off IPv6 scope-id (if necessary)
      remoteDestination = new InetSocketAddress(host, port);
      InetAddress inetAddress = ((InetSocketAddress) remoteDestination).getAddress();
      if (inetAddress instanceof Inet6Address)
      {
         Inet6Address inet6Address = (Inet6Address) inetAddress;
         if (inet6Address.getScopeId() != 0)
         {
            try
            {
               remoteDestination = new InetSocketAddress(InetAddress.getByAddress(inet6Address.getAddress()), ((InetSocketAddress) remoteDestination).getPort());
            }
            catch (UnknownHostException e)
            {
               throw new IllegalArgumentException(e.getMessage());
            }

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    byte[] addr = getInetAddress().getAddress();
    int scopeSize = 0;
    int scopeID = 0;
    if (getInetAddress() instanceof Inet6Address) {
      try {
        Inet6Address ip6Addr = (Inet6Address) getInetAddress();
        Method m = Inet6Address.class.getMethod("getScopeId", null);
        Object scope = m.invoke(ip6Addr, null);
        scopeID = ((Number)scope).intValue();
        scopeSize = 4;
      }

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            if (addr instanceof Inet4Address) {
                Inet4Address addr4 = (Inet4Address)addr;
                ret[2] = r.newFixnum(AF_INET); //AF_INET
            } else if (addr instanceof Inet6Address) {
                Inet6Address addr6 = (Inet6Address)addr;
                ret[2] = r.newFixnum(AF_INET6); //AF_INET
            }
            return r.newArrayNoCopy(ret);
        } catch(UnknownHostException e) {
            throw sockerr(context.getRuntime(), "gethostbyname: name or service not known");

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`::FFFF:129.144.52.38`
`::129.144.52.38`

`::FFFF:d.d.d`
`::FFFF:d.d`
`::d.d.d`
`::d.d`