To tell that something changed, a monitor needs something to compare against. The first check of a domain therefore only records how it looks at that moment.
The first check stores the state it finds: the name servers, mail servers, SPF and DMARC records, and the dates. This is the reference for every later check.
Without an earlier state, nothing can be called a change. Reporting every record as new would only produce a flood of alerts on the first day.
Each later check is compared with the state before it. A difference becomes an alert, and the new state becomes the reference.
The baseline records what is there, not whether it is right. If a record was already wrong at the start, it is a starting point, not a warning.
Domain Night Watch stores the starting state of each new domain, and alerts you to changes after that. Open Domain Night Watch
Domain Night Watch is in testing.
Last reviewed: 2026-11-02
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