After registration You can apply second factor authentication via TBP (time based password) on SMS
or pre generated OTP
(one time password).
Register form any service, you get single sign on Account on all Spyse services: FindSubDomains.com, CertDB.com, DNStable.com, ParseIP.com, PortMap.com
After registration, you will receive a perpetual free account, including 50 requests with no restricted data and 5 tasks for collecting data for each month allocated for all online services: findsubdomains.com, dnstable.com, portmap.com, parseip.com, certdb.com.