Domain Name System (DNS) is mission-critical to all organizations that connect to the Internet. DNS maps the name used to locate a website, such as https://www.neustar.biz/, to a corresponding IP address (156.154.179.5) Currently, there are about 1.2 billion websites and 3.2 billion email accounts. These will surge by 2020 to 4.1 billion internet users and 26.3 billion networked devices and connections. By 2027, tens of billions of smart objects will be internet enabled with IP addresses.”]
Source: https://www.csoonline.com/article/3199249/why-dns-is-more-critical-and-more-vulnerable.html