ZyXEL Communications VWG1312-B10A User Manual page 108

Chapter 6 Broadband
compose the network address. The prefix length is written as "/x" where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (2001:db8) is the subnet prefix.
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VMG1312-B10A User's Guide