Domain History Report
The complete historical WHOIS/RDAP record for a single domain — every snapshot we hold, the ownership-change timeline, and registrar history, delivered as a downloadable report.
Look up a domainWHOIS Lookup
Registrant, registrar, and registration dates for any domain.
RDAP Lookup
Structured registration data via the modern WHOIS successor.
DNS Records
A, AAAA, MX, TXT, NS and other records for any domain.
Nameserver Lookup
See which domains a given nameserver hosts.
IP Address Lookup
Ownership and network data for any IPv4 or IPv6 address.
Domain History
How much historical WHOIS/RDAP we hold for a domain.
Uptime Check
Check whether a website is reachable right now.
Registrars
Browse domain registrars and the domains they manage.
Our Premium Services
For researchers, investigators, and site owners who need more.
Pro Website Monitoring
Watch the domains that matter: uptime, DNS changes, and TLS-certificate expiry, all from one setup. We probe each domain live so you see exactly what we see, then notify you the moment a site goes down, its DNS shifts, or its certificate nears expiry. Up to 10 domains.
Start monitoringPro API Access
Parsed WHOIS, normalized RDAP, and DNS and TLS-certificate history as JSON over HTTPS. Start on the free tier, no card required.
Explore the APIRecord types and builders
Email
SPF & DMARC Check
See email authentication policy in plain English, including fail mode and enforcement.
RecordsA Record Lookup
Find the IPv4 address a hostname currently points to.
RecordsAAAA Record Lookup
Check IPv6 DNS records and confirm dual-stack reachability.
EmailMX Record Lookup
List mail exchangers and their priority for any domain.
RecordsTXT Record Lookup
Inspect verification strings, SPF, DKIM, BIMI and other TXT data.
RecordsNS Record Lookup
Confirm which nameservers are authoritative for a zone.
RecordsCNAME Lookup
Follow alias chains used by CDNs, SaaS and www hosts.
RecordsSOA Record Lookup
Read serial, refresh, retry and expiry from the start of authority.
SecurityCAA Record Lookup
See which certificate authorities are allowed to issue for a domain.
RecordsSRV Record Lookup
Look up service location records for SIP, XMPP, Minecraft and more.
IPReverse DNS Lookup
Resolve an IPv4 or IPv6 address back to a hostname via PTR.
EmailSPF Record Check
Fetch and explain the Sender Policy Framework record.
EmailDMARC Record Check
See whether a domain enforces none, quarantine or reject.
EmailDKIM Record Check
Look up a DKIM selector and inspect the published public key.
BuilderSPF Generator
Build a valid SPF record from includes, IPs and a fail policy.
BuilderDMARC Generator
Compose a DMARC policy with rua, ruf, pct and alignment tags.