The following is a list of the top 21 cybersecurity search engines shared by Basit Alvi on Twitter. This list will be particularly helpful for security researchers (aka ‘hackers’) looking to find deeper information not easily available on Internet search engines like Google, Bing etc.

Shodan

Search for devices connected to the Internet.

Wigle

Database of wireless networks, with statistics.

Grep App

Search across a half million git repos.

Binary Edge

Scans the Internet for threat intelligence.

ONYPHE

Collections cyber-threat intelligence data.

GreyNoise

Search for devices connected to the Internet – just like Shodan.

Censys

Assessing attach surface for Internet connected devices.

Hunter

Search for email addresses belonging to a website.

Fofa

Search for various threat intelligence.

ZoomEye

Gather information about targets.

LeakIX

Search publicly indexed information.

IntelligenceX

Search Tor, I2P, data leaks, domains and emails

Netlas

Search and monitor Internet connect assets.

URL Scan

Free service to scan and analyze websites.

PublicWWW

Marketing and affiliate marketing research.

FullHunt

Search and discovery attack surfaces.

CRT sh

Search for certs that have been logged by CT.

Vulners

Search vulnerabilities in a large database.

Pulsedive

Search for threat intelligence.

Packet Storm Security

Browse latest vulnerabilities and exploits.

GrayHatWarefare

Search public S3 buckets.

Tweet credits: Basit Alvi