| Tool Name | Description |
| mxtoolbox – https://mxtoolbox.com/SuperTool.aspx | DNS, MX, SPF, and blacklist checks |
| ARIN – https://search.arin.net/rdap/ | IP ownership & routing info |
| Brightcloud – https://www.brightcloud.com/tools/url-ip-lookup.php | URL and IP reputation lookup |
| Greynoise – https://viz.greynoise.io/ | View statistical scanning activity from IPs |
| VirusTotal – https://www.virustotal.com | Malware sandbox, hash, and URL lookup |
| messageheader – https://toolbox.googleapps.com/apps/messageheader/ | Visualize email headers |
| SSL Server Test – https://www.ssllabs.com/ssltest/ | Analyze the TLS/SSL configuration of web servers |
| Regex 101 – https://regex101.com/ | Write and test regex |
| Cloudflare Radar – https://radar.cloudflare.com/ | Internet traffic data |
| Hurricane Electric – https://lg.he.net/ | BGP looking glass |
| SANS Podcast – https://isc.sans.edu/podcast.html | SANS internet storm center podcast |
| Cybersecurity Today – https://www.itworldcanada.com/podcasts/cyber-security | Cybersecurity today podcast |
| Vulners – https://vulners.com/ | CVE search |
| epss – https://www.first.org/epss/ | Exploit Prediction Scoring System (EPSS) |
| CISA KEV – https://www.cisa.gov/known-exploited-vulnerabilities-catalog | CISA KEV |
| zerodayinitiative blog – https://www.zerodayinitiative.com/blog | Good blog for patch tuesday |
| APWG report – https://apwg.org/trendsreports/ | APWG phishing activity trends report |
| Microsoft digital defense reports – https://www.microsoft.com/en-us/security/business/security-intelligence-report | Microsoft digital defense reports |
| SANS cheat sheets – https://www.sans.org/blog/the-ultimate-list-of-sans-cheat-sheets/ | SANS cheat sheets |