BounceProtect
Clean your email lists before you send
Look up domain registration details for any site.
Look up registrar, registered date, expiry, registrant country, name servers, and status using the free RDAP protocol.
Why use WHOIS / RDAP data?
Registration age, expiry date, registrar, and name servers help you judge how established a domain is. Newly registered or soon-to-expire domains are higher risk for outbound email, while DNS infrastructure details can explain MX, SPF, or DMARC problems.
Enter a domain to look up registration details
Want to validate your whole list?
BounceProtect validates emails in bulk — SMTP, MX, catch-all detection, and company intelligence.
Try BounceProtect free →18.4M
emails validated this month
42,000+
domains protected
99.2%
accuracy on independent benchmarks
99.2%
accuracy on independent benchmarks
Frequently asked
WHOIS is a protocol used to query databases that store the registered users of an Internet resource — primarily domain names. It returns information like who registered a domain, when it was registered, when it expires, and which name servers it uses.
Related free tools
Done with the generator?
Make sure none of your 10,000 contacts are about to bounce.
You just authenticated your domain. Now check the list you're about to send is clean. BounceProtect verifies email addresses in bulk — catch-all detection, SMTP validation, MX checks — before they damage your sender reputation.
87%
Average bounce rate reduction in first 30 days
12s
Average analysis time for a 10k list