RFC 4291:IP Version 6 Addressing Architecture
RFC-Ref

NTP


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... The "meaning" of a permanently-assigned multicast address is independent of the scope value. For example, if the "NTP servers group" is assigned a permanent multicast address ...
... 101 (hex), then FF01:0:0:0:0:0:0:101 means all NTP servers on the same interface (i.e., the same node ...
... sender. FF02:0:0:0:0:0:0:101 means all NTP servers on the same link as the sender ...
... sender. FF05:0:0:0:0:0:0:101 means all NTP servers in the same site as the sender. ...
... sender. FF0E:0:0:0:0:0:0:101 means all NTP servers in the Internet. ...



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