[Tool #108] CIDR Calculator does not recalculate results when the CIDR input changes

[baixiangcpp]

Summary

CIDR / Subnet Calculator keeps the previous calculation after the CIDR input is replaced. Copy also returns the old calculation instead of the current input.

Affected tool: CIDR / Subnet Calculator
Route: https://byteflow.tools/en/cidr-calculator
Observed during browser acceptance: 2026-08-18

Reproduction

1. Open the affected route with the initial value:

192.168.1.42/24

2. Confirm that the result and Copy output describe the initial network.
3. Replace the input with:

10.42.8.0/22

4. Inspect the result fields.
5. Click Copy and inspect the copied text.

Actual output

The input field shows 10.42.8.0/22, but the result and copied output still describe the old 192.168.1.42/24 calculation. The result is not recomputed from the current input.

Expected output

Changing the input should recalculate every derived field and Copy should use the new calculation. For 10.42.8.0/22, the network should be 10.42.8.0/22, the broadcast should be 10.42.11.255, and the usable host range should be 10.42.8.1 through 10.42.11.254, subject to the exact fields exposed by the tool.

Impact

Users can copy a subnet calculation for a previous network while the visible input shows a different network.

Regression coverage

Change between multiple valid CIDRs, including different prefix lengths, and assert that every displayed field and copied result updates to the latest input.