Bitsquatting refers to the registration of a domain names one bit different than a popular domain. The name comes from typosquatting: the act of registering domain names one key press different than a popular domain. Bitsquatting frequently resolved domain names makes it possible to exploit computer hardware errors via DNS.

nameserver 127.0.0.1

This paper covers how DNS works: first at a high level, then by picking apart an individual packet exchange field by field. Next, we’ll use this knowledge to see how weaknesses in common implementations can lead to cache poisoning.