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Domain Name System (DNS) makes an online entity’s domain a critical component of its infrastructure. To date, DNS attacks cost victims an average of US$1.07 million per incident, highlighting the need for effective DNS security. To help organizations maintain the integrity of their business gateways, we looked at five of the best DNS lookup tools that they can consider using. We provide APIs, databases, and tools such as DNS Lookup API, MXToolbox and DNSInspect.