Classless Inter-Domain Routing, CIDR
Since writing out the number of IP addresses in use by each CIDR level would be a daunting task in itself (think lots of commas and numbers), we have decided to share this visual guide to IPv6 subnetting instead.
2606:1880:0123:4567:89AB:CDEF:1234:5678
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |128 Single end-points and loopback
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |127 Point-to-point links (inter-router)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |124
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |120
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 116
| | | | | | | | | | | | | | | | | | | | | | | | | | |112
| | | | | | | | | | | | | | | | | | | | | | | | | |108
| | | | | | | | | | | | | | | | | | | | | | | | |104
| | | | | | | | | | | | | | | | | | | | | | | | 100
| | | | | | | | | | | | | | | | | | | | | | |96 (previous default prefix issued by Mean Servers to clients)
| | | | | | | | | | | | | | | | | | | | | | 92
| | | | | | | | | | | | | | | | | | | | |88
| | | | | | | | | | | | | | | | | | | | 84
| | | | | | | | | | | | | | | | | | |80
| | | | | | | | | | | | | | | | | |76
| | | | | | | | | | | | | | | | |72
| | | | | | | | | | | | | | | | 68
| | | | | | | | | | | | | | |64 (default prefix issued by Mean Servers to clients)
| | | | | | | | | | | | | |60 Some (very limited) 6rd deployments (/60 = 16 /64)
| | | | | | | | | | | | |56 Minimal end sites assignment(e.g. Home network) (/56 = 256 /64)
| | | | | | | | | | | | 52 (/52 = 4096 /64)
| | | | | | | | | | |48 Typical assignment for larger sites (65536 /64, $5/month fee per /48)
| | | | | | | | | |44
| | | | | | | | |40
| | | | | | | | 36 extra-small allocations (prefix Mean Servers uses at each data center)
| | | | | | |32 LIR minimum allocations (current prefix issued to Mean Servers)
| | | | | |28 LIR medium allocations
| | | | |24 LIR large allocations
| | | | 20 LIR extra large allocations
| | |16
| |12 Regional Internet Registry allocations from IANA
|8
4
Special Purpose IP Addresses (reserved)
| Address block (CIDR) | Range | Number of Addresses | scope | Purpose |
|---|---|---|---|---|
| ::/128 | :: | 1 | software | Unspecified address |
| ::1/128 | ::1 | 1 | host | loopback address to the local host. |
| ::ffff:0:0/96 | ::ffff:0.0.0.0 – ::ffff:255.255.255.255 | 232 | software | IPv4 mapped addresses |
| 100::/64 | 100:: – 100::ffff:ffff:ffff:ffff | 264 | Discard Prefix RFC 6666 | |
| 64:ff9b::/96 | 64:ff9b::0.0.0.0 – 64:ff9b::255.255.255.255 | 232 | global Internet | IPv4/IPv6 translation (RFC 6052) |
| 2001::/32 | 2001:: – 2001::ffff:ffff:ffff:ffff:ffff:ffff | 296 | global | Teredo tunneling |
| 2001:10::/28 | 2001:10:: – 2001:1f:ffff:ffff:ffff:ffff:ffff:ffff | 2100 | software | Deprecated (previously ORCHID) |
| 2001:20::/28 | 2001:20:: – 2001:2f:ffff:ffff:ffff:ffff:ffff:ffff | 2100 | software | ORCHIDv2 |
| 2001:db8::/32 | 2001:db8:: – 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff | 296 | documentation | Addresses used in documentation |
| 2002::/16 | 2002:: – 2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff | 2112 | global Internet | 6to4 |
| fc00::/7 | fc00:: – fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | 2121 | private network | Unique local address |
| fe80::/10 | fe80:: - febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff | 2118 | link | Link-local address |
| ff00::/8 | ff00:: – ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff | 2120 | global Internet | Multicast |
Private IP address space
Most clients will never see private IP address space in use on the Mean Servers network but rather our public space instead. At this time, Mean Servers does not have a local private IPv6 network for clients to use. If you require a private network to interlink your services with Mean Servers, we recommend you use IPv4 for linking local machines together. Contact our support team for additional information on how we can assist in enabling a private IPv4 network space for you.
| RFC 4193 Block | Prefix/L | Global ID (random) | Subnet ID | Number of interface addresses in subnet |
|---|---|---|---|---|
| fd00::/8 | fd | xx:xxxx:xxxx | yyyy | 18,446,744,073,709,551,616 |
| 48 bits | 16 bits | 64 bits | ||