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IPv6 Subnet Cheat Sheet

Your complete reference for IPv6 prefix lengths. Search by CIDR to instantly determine total host capacities and standard /64 subnet boundaries.

Prefix Length (CIDR) Total IP Addresses Number of /64 Subnets Typical Use / Notes
/02128264Default Route
/12127263Regional Internet Registry (RIR)
/22126262Regional Internet Registry (RIR)
/32125261Regional Internet Registry (RIR)
/42124260Regional Internet Registry (RIR)
/52123259Regional Internet Registry (RIR)
/62122258Regional Internet Registry (RIR)
/72121257Regional Internet Registry (RIR)
/82120256Regional Internet Registry (RIR)
/92119255Regional Internet Registry (RIR)
/102118254Regional Internet Registry (RIR)
/112117253Regional Internet Registry (RIR)
/122116252Regional Internet Registry (RIR)
/132115251Regional Internet Registry (RIR)
/142114250Regional Internet Registry (RIR)
/152113249Regional Internet Registry (RIR)
/162112248Regional Internet Registry (RIR)
/172111247Regional Internet Registry (RIR)
/182110246Regional Internet Registry (RIR)
/192109245Regional Internet Registry (RIR)
/202108244Regional Internet Registry (RIR)
/212107243Regional Internet Registry (RIR)
/222106242Regional Internet Registry (RIR)
/232105241Regional Internet Registry (RIR)
/242104240Regional Internet Registry (RIR)
/252103239Regional Internet Registry (RIR)
/262102238Regional Internet Registry (RIR)
/272101237Regional Internet Registry (RIR)
/282100236Regional Internet Registry (RIR)
/29299235Regional Internet Registry (RIR)
/30298234Regional Internet Registry (RIR)
/31297233Regional Internet Registry (RIR)
/32296232Standard ISP Allocation
/33295231Routing Prefix
/34294230Routing Prefix
/35293229Routing Prefix
/36292228Routing Prefix
/37291227Routing Prefix
/38290226Routing Prefix
/39289225Routing Prefix
/40288224Routing Prefix
/41287223Routing Prefix
/42286222Routing Prefix
/43285221Routing Prefix
/44284220Routing Prefix
/45283524,288Routing Prefix
/46282262,144Routing Prefix
/47281131,072Routing Prefix
/4828065,536Standard Enterprise Site
/4927932,768Routing Prefix
/5027816,384Routing Prefix
/512778,192Routing Prefix
/522764,096Routing Prefix
/532752,048Routing Prefix
/542741,024Routing Prefix
/55273512Routing Prefix
/56272256Small Site / Home Network
/57271128Routing Prefix
/5827064Routing Prefix
/5926932Routing Prefix
/6026816Routing Prefix
/612678Routing Prefix
/622664Routing Prefix
/632652Routing Prefix
/642641Single LAN Segment (SLAAC)
/65263N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/66262N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/67261N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/68260N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/69259N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/70258N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/71257N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/72256N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/73255N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/74254N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/75253N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/76252N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/77251N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/78250N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/79249N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/80248N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/81247N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/82246N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/83245N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/84244N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/85243N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/86242N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/87241N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/88240N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/89239N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/90238N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/91237N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/92236N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/93235N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/94234N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/95233N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/96232N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/97231N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/98230N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/99229N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/100228N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/101227N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/102226N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/103225N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/104224N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/105223N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/106222N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/107221N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/108220N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/109219N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/110218N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/111217N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/112216N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/113215N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/114214N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/115213N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/116212N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/117211N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/118210N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/11929N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12028N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12127N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12226N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12325N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12424N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12523N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12622N/A (Smaller than /64)Rarely Used (Breaks SLAAC)
/12721N/A (Smaller than /64)Point-to-Point Link (RFC 6164)
/1281N/A (Smaller than /64)Single Host (Loopback/Device)

IPv6 Address Scopes & Types

Unlike IPv4, where a device usually has a single IP address, an IPv6 interface almost always possesses multiple IP addresses simultaneously, each serving a different "Scope" or boundary limit.

Primary IPv6 Address Types

Address Type Starting Prefix IPv4 Equivalent Routing Scope / Description
Global Unicast2000::/3Public IP AddressesGlobally routable on the public Internet. These are standard public addresses assigned by ISPs.
Unique Local (ULA)fc00::/7 (usually fd00::/8)Private IPs (e.g., 10.x.x.x)Routable only within a private organization. Will be dropped by public Internet routers.
Link-Localfe80::/10APIPA (169.254.x.x)Automatically generated on every IPv6 interface. Routable only on the immediate physical network link. Used heavily for neighbor discovery and router communication.
Multicastff00::/8Class D (224.x.x.x)Used to send a single packet to multiple specific destinations simultaneously. Note: IPv6 does not use "Broadcast" addresses; Multicast replaces it entirely.

Special Use IPv6 Addresses

Address Name / Designation Purpose
::1/128Loopback (Localhost)Used by a device to send traffic to itself (equivalent to IPv4 127.0.0.1).
::/128Unspecified AddressUsed as a source address while a device is requesting an IP configuration (equivalent to IPv4 0.0.0.0).
::/0Default RouteDirects traffic to the default gateway for unknown destinations.

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