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Methodology

Measurements must be verifiable

Sendequelle separates technical observations, assessments and recommended actions. Public one-off checks explain their network scope; continuous monitoring uses stored, versioned states.

How a result is produced

1

Normalise

Inputs are limited to public domain names. URLs, ports, email addresses and private or reserved targets are rejected.

2

Observe safely

DNS is queried through defined resolvers or authoritative servers. Permitted HTTPS connections validate and pin the destination IP against DNS rebinding.

3

Evaluate meaning

Parsers check syntax, effective policies, dependencies, limits and contradictions as well as presence.

4

Store evidence

Result codes, observed and expected values, probe identity, duration, timestamp and checker version make findings traceable.

5

Explain clearly

Findings describe the observation, possible impact and next step. Unknown information remains explicitly unknown.

Published methodology versions

Stored results remain linked to their original assessment basis through a permanent version reference.

Methodology in monthly measurements

The public landscape report shows how qualified one-off checks are aggregated without domain lists, protected by minimum cell sizes and explained with their selection bias.

Open landscape report

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