Loading Now
Interactive Content

🧠 DNS CIDR Challenge: Drag-and-Drop Reverse DNS Fun!

🚀 DNS CIDR Challenge: Reverse DNS Fun for Network Brains

Welcome to a new kind of subnet logic puzzle: the DNS CIDR Challenge at https://allthesystems.com/dns-cidr-challenge/!

What is it?

This interactive tool helps you master reverse DNS zone delegation by asking:

  • Which PTR zone does a specific IP belong to?
  • How are CIDR ranges mapped in DNS?
  • Can you drag the IP to its rightful reverse DNS zone?

Perfect for sysadmins, network engineers, and DNS troubleshooters alike.

How it Works 🧩

You’re presented with several IP addresses and possible DNS zone delegation ranges: /24, /28, etc. Your job is to drag each IP onto the matching reverse zone block.

Your score updates in real time, and incorrect drops give you feedback so you can learn why!

Why Play This?

  • Reinforce knowledge of CIDR blocks
  • Understand how in-addr.arpa zones get cut
  • Improve DNS delegation confidence

Need to brush up on subnetting? Try our Subnet DropZone 🎯 or if Linux CLI is more your jam, check out Linux Command Challenge.
Skylar Pearce

My name is Skylar Pearce, I have been working as a System Administror since 2013 as well some side consulting work. During my career I have worked with everything from Active Directory and vCenter to configuring routers and switches and phone systems, documenting and scripting my way through the whole thing. I have a Security+ certification and am currently working on my PenTest+. Throughout my career I have gained almost all of my knowledge from blogs like this. It is now time for me to pay it back. Over time I have gathered scripts and tricks over the years that I will share on this site. A lot of the posts here will be mainly reference posts, some will be full on how to’s. I am happy to go into more depth on any other topics I go over here, just make a comment on a post. I will do my best to post once a day on weekdays but as I run out of ideas it may slow down. My WordPress skills are still growing so the site will likely get better over time as I learn. You can reach me at contact@allthesystems.com or on LinkedIn

view all posts

Related Posts

You May Have Missed