IP Range Report Generator
Summarize inputs, calculations, and assumptions.
IP Range Report Generator: inputs and results
Enter an IP address, CIDR prefix, or range. Then check its first and last address below.
Calculated Boundaries & ParametersReady
Key Capabilities
- •100% Client-Side: Zero telemetry or server latency.
- •RFC Compliant: Exact 32-bit and 128-bit integer precision.
- •Quick Copy: Instant access to CIDR, mask, and range bounds.
- •Cross-Platform: Works on desktop, tablet, and mobile browsers.
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How IP Range Report Generator Works?
This tool works by collecting the inputs, every calculation result, and every assumption used, then assembling them into 1 structured report.
Select the inputs
Choose the prefixes, ranges, or plan records to report on.
Run the calculations
The generator computes boundaries, host counts, overlaps, gaps, and utilization.
Record the assumptions
The report states the rules used, such as RFC 3021 for /31 links or the AWS 5-address reservation.
Export the report
The report downloads as HTML, PDF, or Markdown with a timestamp.
IP Range Report Generator Formula
The formula is Report = Inputs + Calculations + Assumptions + Findings, with every number traceable to an input and a rule.
Total space
Σ 2^(32 − p_i)All reported blocks.
Usable space
Σ (2^(32 − p_i) − R)R = reservations per the stated rule.
Overlaps found
count of overlapping pairsFrom pairwise checks.
Utilization
Used ÷ Usable × 100 %When usage data is supplied.
Worked example: report summary for 3 prefixes
Inputs : 10.0.0.0/24, 10.0.1.0/25, 10.0.0.128/26 Listed space: 448 addresses (256 + 128 + 64) Unique space: 384 addresses after merging Findings : 1 overlap (10.0.0.128/26 inside 10.0.0.0/24) Assumption : standard rule, 2 reserved addresses per subnet
IP Range Report Generator Conversion Table
The table outlines the 6 sections of a generated report and the content of each.
| Section | Content | Example |
|---|---|---|
| 1. Inputs | Every prefix and range as entered | 10.0.0.0/24, 10.0.1.0/25, 10.0.0.128/26 |
| 2. Normalized set | Canonical CIDR after merging | 10.0.0.0/24, 10.0.1.0/25 |
| 3. Calculations | Network, broadcast, hosts per block | 10.0.0.0/24 → 254 usable hosts |
| 4. Findings | Overlaps, gaps, misalignment | 10.0.0.128/26 overlaps 10.0.0.0/24 |
| 5. Assumptions | Reservation rules and RFCs applied | Standard −2 rule; RFC 3021 for /31 |
| 6. Metadata | Timestamp and tool version | 2026-11-11 10:00 UTC |
What is IP Range Report Generator?
The IP Range Report Generator is a tool that summarizes address inputs, calculation results, and the assumptions behind them in a single shareable report.
Network changes need evidence: change boards, auditors, and clients ask how a subnet size was chosen and what rules were applied. A report that lists inputs, results, and assumptions together answers those questions without a follow-up meeting.
Stating assumptions matters. The same /24 has 254 usable hosts under the standard rule and 251 in AWS. A report without the rule leaves the number open to misreading.
What are the uses of IP Range Report Generator?
There are 4 main uses of the IP Range Report Generator, including change requests, audits, and client deliverables.
Supporting change requests
Change boards receive the full calculation behind a new allocation.
Answering audit requests
Auditors see inputs, rules, and results in 1 document.
Delivering client designs
Consultants hand clients a report with every assumption stated.
Archiving design decisions
Timestamped reports record why a plan looked the way it did.