IPv6 subnetting reference
Encyclopedia
This IPv6 subnetting reference lists the sizes for IPv6
computer networks. Different types of network links may require different subnet sizes. The CIDR netmask separates the bits of the network identifier prefix from the bits of the interface identifier. Selecting a smaller prefix size results in fewer number of networks covered, but with more addresses within those networks.
Stateless address autoconfiguration works only with /64 prefixes.
|||| |||| |||| |||| |||| |||| |||| ||||
|||| |||| |||| |||| |||| |||| |||| |||128 Single end-points and loopback
|||| |||| |||| |||| |||| |||| |||| ||124
|||| |||| |||| |||| |||| |||| |||| |120
|||| |||| |||| |||| |||| |||| |||| 116
|||| |||| |||| |||| |||| |||| |||112
|||| |||| |||| |||| |||| |||| ||108
|||| |||| |||| |||| |||| |||| |104
|||| |||| |||| |||| |||| |||| 100
|||| |||| |||| |||| |||| |||96
|||| |||| |||| |||| |||| ||92
|||| |||| |||| |||| |||| |88
|||| |||| |||| |||| |||| 84
|||| |||| |||| |||| |||80
|||| |||| |||| |||| ||76
|||| |||| |||| |||| |72
|||| |||| |||| |||| 68
|||| |||| |||| |||64 Single End-user LAN (default prefix size for SLAAC)
|||| |||| |||| ||60 Some (very limited) 6rd deployments
|||| |||| |||| |56 Minimal end sites assignment (e.g. Home network
)
|||| |||| |||| 52
|||| |||| |||48 Typical assignment for larger sites
|||| |||| ||44
|||| |||| |40
|||| |||| 36 possible future Local Internet registry
extra-small allocations
|||| |||32 Local Internet registry
minimum allocations
|||| ||28 Local Internet registry
medium allocations
|||| |24 Local Internet registry
large allocations
|||| 20 Local Internet registry
extra large allocations
|||16
||12 Regional Internet Registry
allocations from IANA
|8
4
IPv6
Internet Protocol version 6 is a version of the Internet Protocol . It is designed to succeed the Internet Protocol version 4...
computer networks. Different types of network links may require different subnet sizes. The CIDR netmask separates the bits of the network identifier prefix from the bits of the interface identifier. Selecting a smaller prefix size results in fewer number of networks covered, but with more addresses within those networks.
Stateless address autoconfiguration works only with /64 prefixes.
CIDR Prefixes
2001:0db8:0123:4567:89ab:cdef:1234:5678|||| |||| |||| |||| |||| |||| |||| ||||
|||| |||| |||| |||| |||| |||| |||| |||128 Single end-points and loopback
Loopback
Loopback describes ways of routing electronic signals, digital data streams, or flows of items from their originating facility back to the source without intentional processing or modification...
|||| |||| |||| |||| |||| |||| |||| ||124
|||| |||| |||| |||| |||| |||| |||| |120
|||| |||| |||| |||| |||| |||| |||| 116
|||| |||| |||| |||| |||| |||| |||112
|||| |||| |||| |||| |||| |||| ||108
|||| |||| |||| |||| |||| |||| |104
|||| |||| |||| |||| |||| |||| 100
|||| |||| |||| |||| |||| |||96
|||| |||| |||| |||| |||| ||92
|||| |||| |||| |||| |||| |88
|||| |||| |||| |||| |||| 84
|||| |||| |||| |||| |||80
|||| |||| |||| |||| ||76
|||| |||| |||| |||| |72
|||| |||| |||| |||| 68
|||| |||| |||| |||64 Single End-user LAN (default prefix size for SLAAC)
|||| |||| |||| ||60 Some (very limited) 6rd deployments
|||| |||| |||| |56 Minimal end sites assignment (e.g. Home network
Home network
A home network or home area network is a residential local area network . It is used for communication between digital devices typically deployed in the home, usually a small number of personal computers and accessories, such as printers and mobile computing devices...
)
|||| |||| |||| 52
|||| |||| |||48 Typical assignment for larger sites
|||| |||| ||44
|||| |||| |40
|||| |||| 36 possible future Local Internet registry
Local Internet Registry
A local Internet registry is an organization that has been allocated a block of IP addresses by a regional Internet registry , and that assigns most parts of this block to its own customers. Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in an RIR is...
extra-small allocations
|||| |||32 Local Internet registry
Local Internet Registry
A local Internet registry is an organization that has been allocated a block of IP addresses by a regional Internet registry , and that assigns most parts of this block to its own customers. Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in an RIR is...
minimum allocations
|||| ||28 Local Internet registry
Local Internet Registry
A local Internet registry is an organization that has been allocated a block of IP addresses by a regional Internet registry , and that assigns most parts of this block to its own customers. Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in an RIR is...
medium allocations
|||| |24 Local Internet registry
Local Internet Registry
A local Internet registry is an organization that has been allocated a block of IP addresses by a regional Internet registry , and that assigns most parts of this block to its own customers. Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in an RIR is...
large allocations
|||| 20 Local Internet registry
Local Internet Registry
A local Internet registry is an organization that has been allocated a block of IP addresses by a regional Internet registry , and that assigns most parts of this block to its own customers. Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in an RIR is...
extra large allocations
|||16
||12 Regional Internet Registry
Regional Internet Registry
A regional Internet registry is an organization that manages the allocation and registration of Internet number resources within a particular region of the world...
allocations from IANA
|8
4
See also
- IPv6IPv6Internet Protocol version 6 is a version of the Internet Protocol . It is designed to succeed the Internet Protocol version 4...
- IPv6 addressIPv6 addressAn Internet Protocol Version 6 address is a numerical label that is used to identify a network interface of a computer or other network node participating in an IPv6-enabled computer network....
- SubnetworkSubnetworkA subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a network into subnetworks is called subnetting....
- Classless Inter-Domain RoutingClassless Inter-Domain RoutingClassless Inter-Domain Routing is a method for allocating IP addresses and routing Internet Protocol packets. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous addressing architecture of classful network design in the Internet...
(CIDR) - IPv4 subnetting referenceIPv4 subnetting referenceIn the IPv4 address space certain address blocks are specially allocated or reserved for special uses such as loopback interfaces, private networks , and state-less autoconfiguration of interfaces. Such addresses may be used without registration or allocation from Regional Internet Registries...
External links
- RFC 5375 "IPv6 Unicast Address Assignment Considerations", December 2008