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find-exposed-servers

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Find internet-exposed hosts, ports, services and devices using third-party internet-scan data instead of touching the target. Covers Shodan and Censys query syntax, service banners, favicon-hash and TLS-certificate pivots, origin-IP discovery behind Cloudflare or a CDN, and exposed databases, dashboards, cameras and ICS devices. Use when asked what a company has exposed to the internet, to check open ports on an IP or netblock, or to write a Shodan filter query. Applies to external attack-surface management, third-party and vendor security review, M&A technical diligence, and pre-engagement reconnaissance. Reference at useosint.com/skills/find-exposed-servers.

skills/find-exposed-servers/SKILL.md

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Aug 3, 2026
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# Find exposed servers

Internet-wide scanners already scanned your target. Querying their results is
passive — you never send a packet to the target, so nothing appears in their logs
and nothing is attributable to you. The cost is that every result is a claim about
a moment in the past, and the beginner's mistake is reading a banner as the
current state of a live host.

## Which platform first

| You hold | Reach for | Why |
|---|---|---|
| An IP | Shodan host lookup, or the free InternetDB endpoint | One request gives ports, hostnames, and CPEs |
| A netblock or ASN | Shodan `net:`/`asn:` with port faceting | Shows the shape of the estate before you look at individual hosts |
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