Subnets·IPv6 /98
IPv6
/98
1,073,741,824

IPv6 /98 prefix

/98 means the first 98 bits are the network and 30 are left for hosts. That is 1,073,741,824 addresses.

Addresses are 128 bits, so nobody writes a mask — only the prefix length. A home gets a /56, a single network a /64.

Prefix
/98
Host bits
30
Addresses
1,073,741,824
Usable hosts
1,073,741,824
/64 networks inside
None
Nibble boundary
No

Prefixes either side

/952^332^33/964,294,967,2964,294,967,296/972,147,483,6482,147,483,648/99536,870,912536,870,912/100268,435,456268,435,456/101134,217,728134,217,728

How to read this

  • /24 means the first 24 bits are the network; the remaining 8 hold the addresses inside it.
  • Each extra bit splits the network in two and halves the addresses.
  • Usable addresses are normally the total minus two — the network and broadcast addresses.
  • IPv6 has no broadcast, so nothing is subtracted. One network is conventionally a /64.

Frequently asked questions

Q. How many addresses are in a /98?

1,073,741,824, of which 1,073,741,824 can actually be handed out.

Q. How is a /98 written?

IPv6 uses no mask — you simply write /98.

Q. How many /64 networks fit in a /98?

None — it is narrower than a /64.

Q. How many host bits are there?

30. Each extra network bit halves the addresses.