Alternatives to Subfinder
Find subdomains using passive online data sources. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Subfinder
Find subdomains using passive online data sources.
Replacements
Listings that take over the same core job as Subfinder.
DNSRecon
A Python command-line script for DNS enumeration, record lookups, zone transfer checks and subdomain brute-forcing.
DNSRecon is an open-source Python command-line tool that finds subdomains by brute-forcing and also runs record lookups and zone transfer checks, rather than using passive sources.
DNSDumpster
A web tool that discovers DNS records and hosts related to a domain for security research.
DNSDumpster is a free web tool with nothing to install that maps a domain's visible hosts passively, without API credentials or command-line use.
dnsx
Query DNS records in bulk from the command line.
dnsx is an MIT-licensed tool from the same ecosystem that queries DNS records in bulk, useful for resolving candidates rather than gathering them from passive sources.
Similar software
Related functionality, not a direct replacement.
httpx
Inspect HTTP services with ProjectDiscovery's command-line toolkit.
Naabu
Discover listening network ports with a command-line scanner.
Katana
Map links and pages with a configurable web crawler.
dnstwist
A domain permutation engine that finds lookalike domains used for typosquatting, phishing and impersonation.
Censys
An internet intelligence platform for searching hosts, services and TLS certificates across the internet.
Shodan
A search engine that indexes internet-connected devices and the services they expose.
