Orisift

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Orisift is one API for checking the contact data your forms and systems collect. A single POST /v1/lookup call checks phone numbers (format, numbering plan and ranges reserved for fiction), email domains (MX, Null MX, DNS and a list of 8,986 known throwaway-provider domains), IP addresses (reserved and special-purpose ranges, reverse DNS) and domains (A, MX, NS, SPF and DMARC records). Each lookup returns one of four verdicts, verified, risky, rejected or insufficient_evidence, along with the evidence behind it. When a check can't be settled, it says so rather than guessing. There's a free Reserved Phone Number Checker, 3 free checks a day without an account, and a TypeScript SDK on npm (@orisift/sdk). It checks domains and numbering data, not individual mailboxes, carriers or identity.