DNS reconnaissance tools
aiodnsbrute (asynchronous brute forcing DNS domain names)
Async DNS Brute, or aiodnsbrute, is a security tool to help with resolving many DNS entries and the related discovery.
Fierce (DNS reconnaissance tool)
Fierce is a security tool that helps with DNS reconnaissance. It can locate non-contiguous IP space, but using DNS information.
SubBrute (DNS enumeration tool)
SubBrute is a DNS meta-query spider that enumerates DNS records and subdomains. This can be useful during penetration tests and security assessments.