Cybersecurity search engines differ from regular search engines in their focus. While traditional search engines prioritize indexing and retrieving generally available information, cybersecurity search engines delve into the often hidden corners of the internet, specializing in uncovering data relevant to the ever-evolving world of cybersecurity threats.

Here’s a list of 21 top cybersecurity search engines, along with brief descriptions of their functionalities and why they’re valuable tools for cybersecurity professionals: 

Shodan:

Description: Search for internet-connected devices, including servers, routers, cameras, and industrial control systems.

Use: Identify and assess potential vulnerabilities, discover compromised systems, and gain insights into an organization’s attack surface.

URL: https://www.shodan.io/

Wigle:

Description: Database of wireless networks, with data on signal strength, encryption type, and vendor information.

Use: Identify unauthorized access points, assess wireless network security, and conduct security assessments.

URL: https://wigle.net/login?destination=/map

GreyNoise:

Description: Search for internet-connected devices and provides real-time threat intelligence on their activity.

Use: Identify and investigate malicious actors and campaigns, prioritize security incidents, and improve threat hunting capabilities.

URL: https://www.greynoise.io/

VirusTotal:

Description: Analyze suspicious files and URLs by scanning them with multiple antivirus engines and threat intelligence feeds.

Use: Quickly assess the potential risk of a file or URL, identify malware and other threats, and investigate suspicious activity.

URL: https://www.virustotal.com/

URL Void:

Description: Analyze URLs and websites for malicious content, phishing attempts, and spam.

Use: Identify and block malicious websites, protect users from phishing attacks, and improve overall security posture.

URL: https://www.urlvoid.com/

Vulners:

Description: Search for vulnerabilities in software and hardware based on CVE (Common Vulnerabilities and Exposures) identifiers.

Use: Stay up-to-date on the latest vulnerabilities, prioritize patching efforts, and identify potential risks to systems and applications.

URL: https://vulners.com/

WayBackMachine:

Description: Archive of the internet that allows you to see how websites looked like at different points in time.

Use: Investigate historical data breaches, analyze the evolution of malware websites, and identify potential security risks associated with historical website content.

URL: https://archive.org/web/

Netlas:

Description: Search for domain names, IP addresses, and other network infrastructure information.

Use: Conduct domain name research, investigate suspicious network activity, and identify potential threats associated with specific IP addresses or domains.

URL: https://netlas.io/

ONYPHE:

Description: Search for data leaks and breaches, including exposed email addresses, passwords, and other sensitive information.

Use: Monitor for potential data breaches, investigate security incidents, and identify individuals potentially impacted by a breach.

URL: https://www.onyphe.io/

FullHunt:

Description: Search for information about people, organizations, and domains on the open web.

Use: Conduct open-source intelligence (OSINT) investigations, gather information about potential threats, and support threat hunting activities.

URL: https://www.fullhunt.io/

GrepApp:

Description: Search for specific text strings and patterns within code, logs, and other text files.

Use: Analyze logs for suspicious activity, investigate security incidents, and identify potential vulnerabilities in code.

URL: https://grep.app/

CRT.sh:

Description: Search for information about SSL/TLS certificates, including issuance date, expiry date, and issuing certificate authority.

Use: Identify revoked or expired certificates, assess the validity of certificates, and improve the overall security of your organization’s PKI (Public Key Infrastructure).

URL: https://crt.sh/

GreyHatWarfare:

Description: Search for publicly exposed S3 buckets (storage buckets on Amazon Web Services) that may contain sensitive information.

Use: Identify potential data breaches, assess the security posture of cloud storage environments, and identify potential security risks associated with publicly exposed data.

URL: https://grayhatwarfare.com/

AlienVault Open Threat Exchange (OTX):

Description: Open threat intelligence community that allows users to share and collaborate on threat information.

Use: Stay up-to-date on the latest threats, collaborate with other security professionals, and gain insights into emerging threats and attacker tactics.

URL: https://otx.alienvault.com/

BinaryEdge:

Description: Scans the internet and acquires data transformed into threat intelligence feeds and security reports. Focuses on cybersecurity, data science, and machine learning.

Use: Gain insights into attack surfaces, identify vulnerabilities in devices, and discover compromised systems. Also useful for threat hunting, passive DNS analysis, and threat intelligence gathering.

URL: https://www.binaryedge.io/

TinEye:

Description: Reverse image search engine that allows finding similar or identical images across the web.

Use: Investigate the origin of suspicious images, identify potential malware distribution campaigns using image attachments, and conduct image-based OSINT investigations.

URL: TinEye Reverse Image Search

OSINT Framework:

Description: Website that provides resources and tools for conducting open-source intelligence (OSINT) investigations.

Use: Learn about different OSINT techniques and tools, improve OSINT skills, and gather information to support various security tasks. 

URL: OSINT Framework

Hunter.io:

Description: Search for email addresses associated with a specific domain or website.

Use: Identify potential contacts within an organization, conduct social engineering reconnaissance, and support threat hunting activities.

URL : https://hunter.io/.

LeakIX:

Description: Search for data breaches and leaks across the web, including paste sites, forums, and underground marketplaces.

Use: Monitor for potential data breaches, investigate security incidents, and identify individuals potentially impacted by a breach.

URL: https://leakix.net/

Intelligence X:

Description: Search for information on various topics related to cybersecurity, including threat actors, malware, data leaks, and domains.

Use: Gather information for threat hunting and threat intelligence gathering, conduct investigations into specific security incidents, and stay up-to-date on emerging threats.

URL: Intelligence X (intelx.io)

DNSDumpster:

Description: Search for information about domain names, including subdomains, MX records, and historical WHOIS data.

Use: Conduct domain name research, identify potential vulnerabilities associated with subdomains, and gather information to support various security tasks such as phishing investigations.

URL: https://dnsdumpster.com/ 

Remember, this list serves as a starting point, and exploring other options based on your specific needs and tasks is always recommended.