The Threat Intelligence division at NETSCOUT|Arbor (prev. Arbor Networks) has an Internet safety initiative which identifies services that can potentially be abused by attackers. Internet scanning is often viewed as a malicious activity but can also be used by crawlers and other large-scale scanners to drive traffic, obtain useful statistics, and in our case gather knowledge that will go towards making the Internet a safer place.
Arbor has worked for almost 20 years to help secure the Internet. Scanning is one of the methods we utilize to gain a better understanding of the internet. The collected data is used for research that allows us to identify infected hosts, potentially abusable hosts, and other malicious actors. We ask that you would allow us to continue scanning your address space as our ability to gain insights is directly proportional to our visibility.
Some of our research can be found here:
If you wish to opt out, please contact email@example.com with the prefixes that you would like us to add to our scanning blacklist and we will update our systems as soon as possible.
Alternatively, if you have the ability to whitelist then you could add 184.108.40.206/24 to your whitelist which is our scanning address space.