How far back does DNS history go?

DomainSpy's DNS history tool shows up to 10 years of passive DNS data powered by SecurityTrails. Without a SecurityTrails key, Mnemonic PassiveDNS provides several years of coverage for most domains.

What DNS record types have historical data?

Historical data is available for A, AAAA, CNAME, MX, NS and TXT records. SOA, PTR, SRV and CAA records are shown as live lookups since passive DNS sensors rarely capture them.

Can I see when a domain changed its nameservers?

Yes — the DNS history tool shows NS record changes with first-seen and last-seen dates, making it easy to track nameserver migrations and hosting provider changes over time.

Passive DNS + SecurityTrails

DNS History Timeline

See historical DNS record changes for any domain. A/AAAA/CNAME history via passive DNS — add a SecurityTrails key for full 10-year coverage.

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