1. Shodan
2. Censys
3. ZoomEye
4. BinaryEdge
5. FOFA (Fingerprinting Organizations with Collected Archives)
6. Fofa Pro
7. CIRCL (Computer Incident Response Center Luxembourg)
8. SecurityTrails
9. Netcraft
10. NVD (National Vulnerability Database)
11. VulDB
12. VirusTotal
13. Hybrid Analysis
14. IBM X-Force Exchange
15. MISP (Malware Information Sharing Platform & Threat Sharing)
16. AlienVault Open Threat Exchange (OTX)
17. ThreatConnect
18. VirusShare
19. MalwareBazaar
20. GreyNoise Intelligence
21. MalShare
22. malc0de
23. BGPStream
24. RiskIQ
25. Spyse
26. 4iQ
27. CIRCL OSINT Services
28. ThreatMiner
29. SecurityFocus
30. Exploit Database
31. OSINT Framework
32. http://Hunter.io
33. Cymon
34. ThreatCrowd
35. Pulsedive
36. SpiderFoot
37. Cuckoo Sandbox
38. http://URLScan.io
39. ThreatSTOP
40. FortiGuard Labs
41. Maltiverse
42. Intel 471
43. http://SecurityHeaders.com
44. VxVault
45. URLhaus
46. Phishtank
47. CleanMX
48. PhishStats
49. OpenPhish
50. PhishMe Intelligence
51. SpamCop
52. Feodo Tracker
53. AbuseIPDB
54. AlienVault Labs
55. ZeroFOX
56. URLVoid
57. IPVoid
58. ThreatConnect's Free Threat Intelligence
59. SecurityTrails' DNS History
60. DNSdumpster
61. Project Sonar
62. DNSDB by Farsight Security
63. WHOIS Lookup
64. PassiveTotal
65. ThreatConnect's Free Threat Indicator
66. DomainTools
67. Robtex
68. http://ViewDNS.info
69. CyberChef
70. PacketTotal



Here's 30 fun cybersecurity search engines:

1. DeHashed - View leaked credentials.
2. SecurityTrails - Extensive DNS data.
3. DorkSearch - Really fast Google dorking.
4. ExploitDB - Archive of various exploits.
5. ZoomEye - Gather information about targets.
6. Pulsedive - Search for threat intelligence.
7. GrayHatWarfare - Search public S3 buckets.
8. PolySwarm - Scan files and URLS for threats.
9. Fofa - Search for various threat intelligence.
10. LeakIX - Search publicly indexed information.
11. DNSDumpster - Search for DNS records quickly.
12. FullHunt - Search and discovery attack surfaces.
13. AlienVault - Extensive threat intelligence feed.
14. ONYPHE - Collects cyber - threat intelligence data.
15. Grep App - Search across a half million git repos.
16. URL Scan - Free service to scan and analyse websites.
17. Vulners - Search vulnerabilities in a large database.
18. WayBackMachine - View content from deleted websites.
19. Shodan - Search for devices connected to the internet.
20. Netlas - Search and monitor internet connected assets.
21. CRT sh - Search for certs that have been logged by CT.
22. Wigle - Database of wireless networks, with statistics.
23. PublicWWW - Marketing and affiliate marketing research.
24. Binary Edge - Scans the internet for threat intelligence.
25. GreyNoise - Search for devices connected to the internet.
26. Hunter - Search for email addresses belonging to a website.
27. Censys - Assessing attack surface for internet connected devices.
28. IntelligenceX - Search Tor, I2P, data leaks, domains, and emails.
29. Packet Storm Security - Browse latest vulnerabilities and exploits.
30. SearchCode - Search 75 billion lines of code from 40 million projects.