ASN Lookup: Finding the source of all that spam
Ever wonder where all of that incoming spam comes from? It’s easy to jump to conclusions about the source of the traffic, but what may seem like random domain names and servers might not be as random as you think. Fortunately, we as email administrators can always tell what IP the source came from. That IP belongs to a network, and that network can be attributed to an Autonomous System Number (ASN). By performing an ASN lookup, we can figure out who operates the network of that IP. What is an Autonomous System Number (ASN)? The internet is home to…