More detailsNeighboring subnets, expanded address, reverse DNS, and hextet breakdown
Neighboring /52 subnets
- Expanded address
- Compressed address
- Network (expanded)
- Last address (expanded)
- Prefix mask
- Total addresses (exact)
- Reverse DNS (PTR)
- Host bits / network bits
Hextet breakdown
20010db8abcd12000000000000000000
NetworkSplit groupHost
Quick facts for IPv6 /52
- Prefix mask: ffff:ffff:ffff:f000::
- Total addresses: 2⁷⁶
- Approx. count: 7.56 × 10²²
- /64 subnets: 2¹²
IPv6 /52 reference guideBit split, overview, key facts, sizing tables, design notes, standards, and FAQ
Network / host bit split
netnetnetmixhosthosthosthost
Network bits (52)Split hextetHost bits (76)
- Network bits
- 52
- Host bits
- 76
- Prefix mask
- ffff:ffff:ffff:f000::
- Total addresses
- 2⁷⁶
- Approx. count
- 7.56 × 10²²
- /64 subnets
- 2¹²
- Addresses formula
- 2^76
- /64 relationship
- 2¹² × /64 subnets
Overview
A /52 holds 4,096 /64 subnets (2⁷⁶ addresses). It is a middle-ground delegation size, sometimes given to medium businesses that need more than a /56 but less than a full /48.
Common use cases
- Medium business delegations
- Granular ISP subscriber tiers
Key facts
- A /52 fixes 52 network bits and leaves 76 host bits — 2⁷⁶ total addresses.
- In network design terms, /52 is typically a medium site or business delegation.
- You can subnet a /52 into 2¹² /64 LANs.
Design guidance
A /52 is a practical site or campus delegation. Give each VLAN, Wi-Fi SSID, and security zone its own /64 — do not subnet below /64 on production LANs. With 2¹² available /64s, you have ample room for guest networks, IoT, management, and lab segments.
Practical example
Suppose your ISP delegates 2001:db8:abcd:1200::/52 to your edge router. You could assign 2001:db8:abcd:0012::/64 to your main LAN, 2001:db8:abcd:0013::/64 to guest Wi-Fi, and 2001:db8:abcd:0014::/64 to IoT — using only 3 of the 2¹² available /64 subnets.
Related RFCs and standards
- RFC 4291IPv6 Addressing Architecture
- RFC 6177IPv6 Address Assignment to End Sites
- RFC 3633IPv6 Prefix Options for DHCPv6 Prefix Delegation
Prefix sizing reference
Frequently asked questions
Common questions about IPv6 /52 blocks, prefix sizes, and use cases.