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DNSChecker.org - Check DNS Propagation worldwide. DNS Checker provides name server propagation check instantly. Changed nameservers so do a DNS lookup and check if DNS and nameservers have propagated.
DNSdumpster.com - Open source domain intelligence lookups for security recon
NsLookup.io - A simple and powerful tool for querying DNS records
Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
DNSMap - DNSMap is a website that lets you check the propagation of your website by its domain or IP.