Domain Digger is the full open-source toolkit for next-level domain analysis, providing detailed DNS, IP, WHOIS data, and SSL/TLS history in a user-friendly, no-install interface.

bgp.tools allows you to do bgp debugging and gives insight into internet routing with ease in a user friendly way

Find dns records in order to identify the Internet footprint of an organization. Recon that enables deeper security assessments and discovery of the attack surface.