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Amass
Performs DNS subdomain enumeration by scraping the largest number of disparate data sources, recursive brute forcing, crawling of web archives, permuting and altering names, reverse DNS sweeping and other techniques
Reconnaissance
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Legion
Open source semi-automated discovery and reconnaissance network penetration testing framework
Sublist3r
Fast subdomains enumeration tool for penetration testers
tcpflow
tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis and debugging.
Nmap
Nmap (“Network Mapper”) is a free and open source utility for network discovery and security auditing.
WiGLE
Submission-based catalog of wireless networks
SecurityHeaders
Analyse HTTP Response headers.
DomainBigData
Find registrant and other domains owned by the same person.
ScrapedIn
This tool assists in performing reconnaissance using the LinkedIn website
Canarytokens
Canarytokens is a free tool that helps you discover you’ve been breached by having attackers announce themselves. Quick, Free, Detection for the Masses.
Shodan
Shodan is a search engine for computers and devices connected to the internet using a variety of filters.