Introduction

Another security feature that we can set after gaining control of our IP block is rDNS. This is useful in proving that we control the IP block and assigning URLs to it.

Cloudflare Setup

Under Cloudflare, add a new domain following the ip6.arpa format of reversing the hexadecimal. for example IPv6 Block is 2a06:9f81:3200::0.0.2.3.1.8.f.9.6.0.a.2.ip6.arpa

Choose the free tier and click on Next

Click on when asked to import any DNS records Continue

Click on to add records later Confirm

Copy the new nameservers and provide them to your IP Block provider to update rDNS for them

After the Nameservers are transferred over, add 2 new PTR records, both with the host as and content set to and 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.3.1.8.f.9.6.0.a.2.ip6.arpaipv6.ata.alata.al

Vefying that rDNS is working

Use the following website to check if your domain and rDNS are working https://iamroot.tech/reverse-dns-ptr-lookup/