Admin Task #1: Researching with ARIN Database

If an attacker is doing reconnaissance on a company, information found on can be used as a weapon. For this task, be prepared to think and research like a hacker.

December 4, 2017

About This Challenge can be a wealth of information for an attacker since IP blocks belonging to a company can often be identified. An attacker can gather dangerous information without sending any packets to the target network, therefore, avoiding identification.

While researching, decide whether or not individuals should be listed by name as points of contact, or by position. If inaccuracies are found, report them to to be corrected with authorization from your organization.

Disclaimer: Ensure any activities undertaken on your work network are allowed by your corporate policy and approved by management at your organization.

Follow The Instructions To Complete Today’s Network Defender Task:

Feel free to download the PDF version of the directions for your review.

Download PDF

Task Directions:

Head over to the American Registry for Internet Numbers, or more commonly, ARIN, at Use their SEARCH Whois function and locate your company, or another company, if you cannot locate your own.  (Smaller companies may not be preset in the ARIN database).

Answer the following questions:

1. What IP blocks are assigned to the company?

2. What Autonymous System (AS Number) is assigned to the company?

3. What point of contact (POC) records are listed?

4. Are the records current and accurate?

5. Are individuals or teams listed?

6. What does this information mean for the security of your or their systems?

Once you’ve followed these directions, scroll down to mark this challenge complete.

Once You’ve Completed This Task Click This Button.

I Completed This Task

If your company will not allow you to perform the above task. Please read this security article and click the button above.

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