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Consent under the TCPA attaches to a person — the subscriber who gave it — not to the ten digits they happened to hold at the time. The FCC has estimated that roughly 35 million U.S. phone numbers are disconnected and made available for reassignment each year. Every one of them is a number that may still sit in someone's CRM marked "consented," now ringing a stranger who never opted in to anything.
The do-not-call risk announces itself: there is a registry, you can check it, and the check is the fix. Litigator risk at least leaves a public trail of filed cases. Reassignment risk does neither. The new subscriber registers nothing, files nothing in advance, and appears on no list you hold. Your data looks healthy — the same digits that converted last quarter — right up until the calls start reaching people who never heard of you. The failure surfaces as complaints, demand letters, and named plaintiffs, not as warnings.
The uncomfortable arithmetic: the older a consented list, the more of it has silently changed hands. A number collected two years ago has had two years of chances to be disconnected, aged, and reissued. Nothing in the row tells you which side of that line it is on.
In 2021 the FCC launched the Reassigned Numbers Database — a registry of permanent disconnection dates, assembled from carrier reports. The query is deliberately simple: you submit a phone number and a date, typically the date you obtained consent or last verified contact. The database answers whether the number has been permanently disconnected since that date — yes, no, or no data.
What makes the RND singular in TCPA practice is what the FCC attached to it: a query safe harbor. A caller that checks the database, receives a no, and places the call in reasonable reliance on that answer has a defense if the database turns out to be wrong. No other scrub in the outbound stack carries anything like it — litigator scrubbing, in particular, has no statutory safe harbor at all, which is why Bastro sells it as measurable risk reduction and never as immunity. The RND query is the one place where the check itself changes your legal position, not just your odds.
The safe harbor rewards exactly one behavior: querying before you dial, with a defensible date, and keeping the answer.
Bastro's relocated-number scope flags reassigned, disconnected, and ported numbers in the same pass as litigator and DNC checks, and stores every verdict with the job that produced it — so the answer you relied on is the answer you can produce.
This article describes the FCC's Reassigned Numbers Database and its query safe harbor in general terms, not as a compliance opinion for your campaign. Bastro provides data services, not legal advice.