101 (hex), then:

      FF01:0:0:0:0:0:0:101 means all NTP servers on the same node as the
      sender.

      FF02:0:0:0:0:0:0:101 means all NTP servers on the same link as the
      sender.

      FF05:0:0:0:0:0:0:101 means all NTP servers at the same site as the
      sender.

      FF0E:0:0:0:0:0:0:101 means all NTP servers in the internet.

   Non-permanently-assigned multicast addresses are meaningful only
   within a given scope.  For example, a group identified by the non-
   permanent, site-local multicast address FF15:0:0:0:0:0:0:101 at one
   site bears no relationship to a group using the same address at a
   different site, nor to a non-permanent group using the same group ID
   with different scope, nor to a permanent group with the same group
   ID.

   Multicast addresses must not be used as source addresses in IPv6
   packets or appear in any routing header.

2.7.1 Pre-Defined Multicast Addresses

   The following well-known multicast addresses are pre-defined:

      Reserved Multicast Addresses:   FF00:0:0:0:0:0:0:0
                                      FF01:0:0:0:0:0:0:0
                                      FF02:0:0:0:0:0:0:0
                                      FF03:0:0:0:0:0:0:0
                                      FF04:0:0:0:0:0:0:0
                                      FF05:0:0:0:0:0:0:0
                                      FF06:0:0:0:0:0:0:0
                                      FF07:0:0:0:0:0:0:0
                                      FF08:0:0:0:0:0:0:0
                                      FF09:0:0:0:0:0:0:0




 
RFC 2373              IPv6 Addressing Architecture             July 1998


                                      FF0A:0:0:0:0:0:0:0
                                      FF0B:0:0:0:0:0:0:0
                                      FF0C:0:0:0:0:0:0:0
                                      FF0D:0:0:0:0:0:0:0
                                      FF0E:0:0:0:0:0:0:0
                                      FF0F:0:0:0:0:0:0:0

   The above multicast addresses are reserved and shall never be
   assigned to any multicast group.

      All Nodes Addresses:    FF01:0:0:0:0:0:0:1
                              FF02:0:0:0:0:0:0:1

   The above multicast addresses identify the group of all IPv6 nodes,
   within scope 1 (node-local) or 2 (link-local).

      All Routers Addresses:   FF01:0:0:0:0:0:0:2
                               FF02:0:0:0:0:0:0:2
                               FF05:0:0:0:0:0:0:2

   The above multicast addresses identify the group of all IPv6 routers,
   within scope 1 (node-local), 2 (link-local), or 5 (site-local).

      Solicited-Node Address:  FF02:0:0:0:0:1:FFXX:XXXX

   The above multicast address is computed as a function of a node's
   unicast and anycast addresses.  The solicited-node multicast address
   is formed by taking the low-order 24 bits of the address (unicast or
   anycast) and appending those bits to the prefix
   FF02:0:0:0:0:1:FF00::/104 resulting in a multicast address in the
   range

      FF02:0:0:0:0:1:FF00:0000

   to

      FF02:0:0:0:0:1:FFFF:FFFF

   For example, the solicited node multicast address corresponding to
   the IPv6 address 4037::01:800:200E:8C6C is FF02::1:FF0E:8C6C.  IPv6
   addresses that differ only in the high-order bits, e.g. due to
   multiple high-order prefixes associated with different aggregations,
   will map to the same solicited-node address thereby reducing the
   number of multicast addresses a node must join.

   A node is required to compute and join the associated Solicited-Node
   multicast addresses for every unicast and anycast address it is
   assigned.




 
RFC 2373              IPv6 Addressing Architecture             July 1998