DNS Amplification Factor Calculator
DNS Amplification Factor Calculator: Computes Amplification Factor = Response Size / Request Size = 3200 / 64.
About this dns amplification factor calculator
DNS Amplification Factor Calculator — browser-based utility.
How this tool works
Implements client-side DNS Amplification Factor Calculator operations. Computes Amplification Factor = Response Size / Request Size = 3200 / 64 specifically designed for a ddos mitigation specialist calculates the bandwidth amplification factor of an `any` dns query response.
- Protocol Message De-serialization: Parses raw DNS wire-format byte streams or HAR 1.2 JSON waterfall entries.
- Record Validation & Separation: Enforces RFC 6844 requirements that CAA authorization ('issue', 'issuewild') and reporting ('iodef') tags reside on separate records.
- Waterfall Timing Analysis: Sums network phases (blocked, dns, connect, ssl, send, wait, receive) to evaluate latency waterfalls.
- Visual Diagnostic Reporting: Renders color-coded waterfall timelines and highlights high-latency assets or missing HTTP caching headers.
Worked example
Scenario: Calculate a local DNS amplification ratio from two supplied sizes.
Sample input:
Processing: Divide response bytes by request bytes and apply the fixed >10 / >2 thresholds.
Illustrative output:
Limits and verification
Rejects combined single-line CAA records that violate RFC 6844 syntax. In HAR file analysis, protects against multi-gigabyte log allocations by parsing entry streams with memory safety bounds.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- RFC 1035 (Domain Names - Implementation and Specification)
- RFC 8659 (DNS Certification Authority Authorization - CAA)
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the DNS Amplification Factor Calculator workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What does the calculator compute?+
It parses JSON requestBytes and responseBytes, divides responseBytes by requestBytes, rounds the ratio to two decimals, and returns the original numeric values. It makes no DNS request, sends no packet, captures no response, and does not measure an amplification event or a resolver.
Which inputs and thresholds apply?+
requestBytes must be finite and greater than zero; responseBytes must be finite and non-negative. The page has one JSON text area, Run locally and Load sample. Missing, malformed or nonnumeric JSON cannot establish a network result and validation errors do not inspect any endpoint.
What does the risk label mean?+
The fixed label is high when the unrounded ratio exceeds 10, moderate when it exceeds 2, otherwise low. It is a local threshold label, not a security rating, attack finding, DNS policy check, bandwidth estimate, or proof that a server is open, spoofable, vulnerable, or safe.
What result does the worked example produce?+
In the worked example, the tool exactly matched independent arithmetic for {requestBytes:64,responseBytes:3200}: ratio 50 and high. This proves that local calculation and threshold for those numbers only, not DNS behavior, packet sizes on wire, EDNS effects, reachability, or real abuse risk.