4.2.2.2
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4.2.2.2 is a public IP address reachable from the Internet. The 004/8 classful network is assigned by the Internet Assigned Numbers Authority to Bolt, Beranek and Newman[1]. It is often used by system administrators and technicians as a target address when conducting a ping test since it is both easy to remember and easy to type.
This address is assigned to a backup DNS server, which is open for public use and is often used for troubleshooting purposes. The primary DNS server in the pair is 4.2.2.1.
It is unknown whether Bolt, Beranek and Newman approve of the unauthorised use of their DNS servers.
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