More detailsNeighboring subnets, expanded address, reverse DNS, and hextet breakdown
Neighboring /112 subnets
- Expanded address
- Compressed address
- Network (expanded)
- Last address (expanded)
- Prefix mask
- Total addresses (exact)
- Reverse DNS (PTR)
- Host bits / network bits
Hextet breakdown
20010db8abcd00120000000000000001
NetworkSplit groupHost
Quick facts for IPv6 /112
- Prefix mask: ffff:ffff:ffff:ffff:ffff:ffff:ffff:0
- Total addresses: 2¹⁶
- Approx. count: 6.55 × 10⁴
- /64 subnets: —
IPv6 /112 reference guideBit split, overview, key facts, sizing tables, design notes, standards, and FAQ
Network / host bit split
netnetnetnetnetnetnethost
Network bits (112)Split hextetHost bits (16)
- Network bits
- 112
- Host bits
- 16
- Prefix mask
- ffff:ffff:ffff:ffff:ffff:ffff:ffff:0
- Total addresses
- 2¹⁶
- Approx. count
- 6.55 × 10⁴
- /64 subnets
- —
- Addresses formula
- 2^16
- /64 relationship
- smaller than a /64
Overview
A /112 leaves 16 host bits, giving exactly 65,536 addresses. It is occasionally used for tightly scoped point-to-multipoint links or management networks where a full /64 is unnecessary.
Common use cases
- Constrained management segments
- Lab / documentation examples
Key facts
- A /112 fixes 112 network bits and leaves 16 host bits — 2¹⁶ total addresses.
- In network design terms, /112 is typically a constrained management or lab segment.
- Written out, /112 holds exactly 65,536 addresses.
- A /112 is 1/2⁴⁸ of a standard /64 LAN subnet.
Design guidance
A /112 can work for small management VLANs, out-of-band networks, or certification lab exercises where you deliberately cap the host count. For router interconnects, prefer /127 (RFC 6164) over /112. For ordinary LANs, stay with /64 regardless of how small the segment feels.
Practical example
In a lab, 2001:db8:abcd:0012::1/112 might number a small segment with 65,536 addresses. In production, you would normally expand this to a full /64 unless you have a documented exception.
Prefix sizing reference
Frequently asked questions
Common questions about IPv6 /112 blocks, prefix sizes, and use cases.