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How Much Space Do I Need as an Enterprise Network?
✌🏾The conversation starts here…..
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3 Replies
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40
HPs
0
QPs
1918
XPs
Seems we have to refresh our math/log/indices knowledge
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5
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0
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829
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You show this as entity requirements and come up with a /36 as A need space. wait I dont understand; clarify:
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80
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1899
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Understanding how much IPv6 address space your organization needs starts with recognizing that IPv6 planning is about structure and hierarchy, not conservation. The goal is to request enough space to accommodate current needs, future growth, and logical organization.
Standard Allocation for Enterprises. Most enterprises receive a /48 prefix from their ISP or RIR. This provides 16 bits of subnet space, yielding 65,536 subnets of /64 each. For the vast majority of organizations, a /48 is more than sufficient for current and future needs.
Breaking Down the /48. A typical enterprise can structure their /48 as follows:
First 48 bits → Global Routing Prefix (assigned by ISP/RIR)
Next 16 bits → Subnet ID (managed internally)
Last 64 bits → Interface ID (host addressing)
Estimating Your Subnet Requirements. When planning, count the number of distinct network segments needed, including user VLANs, server segments, DMZs, management networks, point-to-point links, loopbacks, guest networks, and branch offices. Each of these gets a /64 regardless of size.
Planning for Growth. A good rule is to allocate address blocks in powers of two and leave generous gaps between them. For example, if a branch office currently needs 10 subnets, allocate a /52 to that branch, giving it 16 subnets worth of space with room to grow without renumbering.
When a /48 Is Not Enough. Very large enterprises such as multinational corporations, universities, or cloud providers may request a /32 or larger directly from an RIR. This provides an entire block of /48s to distribute across divisions, campuses, or regions, enabling a truly hierarchical global addressing plan.
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