Spyse is described as 'A search engine which collects, processes, and provides structured information about network elements using an OSINT techniques. Provides detailed info on the following elements: DNS, AS, IPv4 Hosts, Ports, Banners, Digital Certificates, and more' and is an app in the security & privacy category. There are six alternatives to Spyse for a variety of platforms, including Web-based, Self-Hosted, Linux, Google Chrome and SaaS apps. The best Spyse alternative is Shodan, which is free. Other great apps like Spyse are Censys, ZoomEye, IVRE and Sublist3r.
Shodan is a search engine that lets you find specific computers (routers, servers, etc.) using a variety of filters. Some have also described it as a public port scan directory or a search engine of banners.
Censys is a search engine that allows computer scientists to ask questions about the devices and networks that compose the internet.
Natlas is an open source project designed to provide scalable network scanning and an interface to search through the results. For more information, visit github.com/natlas/natlas
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