HTTPfy

IPv6 /60 prefix

A /60 leaves 68 bits for subnets and hosts: 295,147,905,179,352,825,856 addresses, or 16 /64 subnets.

IPv6 /60 at a glance

Mask
ffff:ffff:ffff:fff0::
Mask (expanded)
ffff:ffff:ffff:fff0:0000:0000:0000:0000
Host bits
68
Addresses
295,147,905,179,352,825,856
Nibble-aligned
Yes, the boundary falls on a hex digit
Reverse DNS zone
0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa

Typical uses of a /60

A /60 holds 16 /64 networks. Several large residential ISPs delegate a /60 by default, which is enough for a router to number a handful of LANs, guest Wi-Fi and IoT VLANs.

Example: 2001:db8::/60

First address
2001:db8::
Last address
2001:db8:0:f:ffff:ffff:ffff:ffff
Last (expanded)
2001:0db8:0000:000f:ffff:ffff:ffff:ffff
Next /60
2001:db8:0:10::/60

Uses the documentation prefix 2001:db8::/32 (RFC 3849). IPv6 has no broadcast address, so every address in the range is assignable, except where a platform reserves some.

Find the /60 for an address

What a /60 contains

Smaller prefixHow many
/6416
/1124,503,599,627,370,496
/127147,573,952,589,676,412,928
/128295,147,905,179,352,825,856

How many /60s fit

In aNumber of /60s
/32268,435,456
/484,096
/5616

Cloud support for /60

PlatformIPv6 subnet size/60?
AWS VPC/44 to /64 in steps of /4Yes
Azure VNetexactly /64No
Google Cloud VPC/64 (from the VPC's /48)No