IsHostedBy.com - IsHostedBy is a website where you can lookup where certain websites are hosted.
Whoisology - Connected database of whois records and whois history
Ceipam DNS Lookup - Ceipam DNS Lookup is an online DNS record checker tool that you can use to see whether your website server propagation has been successful or not.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Prepostseo DNS Propagation Checker - Prepostseo DNS Propagation Checker is an online tool that allows you to perform a DNS lookup to check the domain name server records against your own website or any other domain, no matter where the servers are located.
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.