IPv6 Transition Calculator
Project how long an IPv6 migration will take at the current pace and what remains dual-stacked.
About IPv6 Transition Calculator
A linear burn-down turns the current rate into a completion date. The same figure tells you how long you will be paying to operate two stacks in parallel. Dual-stack duration is the real cost of a transition, because every extra month means duplicated ACLs, duplicated monitoring and two failure modes for every service.
Formula
IPv6 Transition
months remaining = ceil(remaining services ÷ services migrated per month); completion = migrated ÷ total.
- remaining
- Services still IPv4-only
- perMonth
- Sustained migration throughput
Worked example
With the default values below, IPv6 Transition Calculator returns Months to Complete of 20.0. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Services in scopeaccepts 1–100,000 services
- 480 services
- Already IPv6-enabledaccepts 0–100,000 services
- 130 services
- Services migrated per monthaccepts 0.1–5,000 services/month
- 18 services/month
Results
- Months to Complete
- 20.0
- Current Completion
- 27.1%
- Services Remaining
- 350
- Years of Dual-Stack Operation
- 1.67
Step by step
- 1Values used
- 2IPv6 Transition
- 3Months to Complete= 20.0
- 4Current Completion= 27.1
- 5Services Remaining= 350
- 6Years of Dual-Stack Operation= 1.67
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is IPv6 Transition calculated?
months remaining = ceil(remaining services ÷ services migrated per month); completion = migrated ÷ total. A linear burn-down turns the current rate into a completion date. The same figure tells you how long you will be paying to operate two stacks in parallel.
Why does IPv6 Transition matter?
Dual-stack duration is the real cost of a transition, because every extra month means duplicated ACLs, duplicated monitoring and two failure modes for every service.
What values do I need to enter?
This calculator takes 3 inputs: Services in scope, Already IPv6-enabled, Services migrated per month. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.