This talk explains why Sanitizers are important and how they can be used to help increase the efficiency of mainstream fuzzing. I will be delving into detail about how they work with relevant information about instrumentation and mapping. We will be looking at how the kernel implementation of the Address Sanitizer with a focus on the implementation in NetBSD. In the end of the talk I will be discussing some small examples of userland and kernel land bugs we can detect with the Address Sanitizer and I will use the opportunity to compare the Address Sanitizer with other tools out there.