Validity, country, E.164 format, line type and the carrier the number block was allocated to. No account needed.
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valid
The number is syntactically possible for its country and its block is allocated in the numbering plan. It does not mean the line is connected today.
country / cc
Derived from the dialling code by longest-prefix match, so shared codes like +1 resolve to the right territory rather than just "North America".
e164
The number normalised to international format. This is the form most senders and CRMs want, and the form that deduplicates correctly.
line_type
Mobile, landline, VoIP, or special services, from the numbering plan record for that block. Wholesale VoIP blocks that the source labels as landline are corrected using carrier evidence.
carrier
The carrier the block was originally allocated to, shown under its trading name rather than its legal entity. Read the limits below before relying on it.
reason
Why a number failed. unmatched_prefix means no allocated block matches it,
which is the common case for a made-up or mistyped number.
Portability is the one that catches people out. A number keeps its original block assignment when it moves network, so the carrier here is the allocation, not a live query. Nothing that avoids a live network lookup can tell you otherwise, including every other free checker.
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