81.171.21.207
Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.
Run a live full scan of 81.171.21.207
On-demand: ports, banners, TLS, tech-stack, subdomains and origin/IP-leak detection. Results are shared publicly for everyone to link to.
Autonomous System
Geolocation
Reverse DNS
Network
Open Ports
| Port | Proto | Service | Server | Last seen |
|---|---|---|---|---|
| 443 | tcp | https | — | 2026-07-21 16:41:44.000 |
TLS Certificates
Tech Stack
Detected via Wappalyzer-style rules on the HTTP response body, headers, scripts and meta tags.
Origin / IP-Leak
When a hostname is served behind a CDN (e.g. Cloudflare), the origin server can sometimes be identified by matching its TLS cert against the protected hostname. Findings shown here are heuristic candidates, not guarantees.
No origin-leak candidates for this IP
When this IP serves a TLS cert for a domain that fronts behind a CDN, that domain surfaces here as an origin-leak candidate with a confidence score.
Multi-Vantage Check
Reachability accrued passively from real user-triggered checks across our 65+ probe nodes. Run a live check to add fresh data.
No accumulated reachability data yet
Reachability accrues from real user-triggered checks. Trigger a Ping or HTTP check from our 65+ probe nodes to contribute the first data point.
Threat Intelligence
No threat-intel matches
This IP doesn't appear in any of the feeds we mirror (Tor exits, FireHOL Level 1-3, Spamhaus DROP/EDROP, URLhaus, OpenPhish). Absence here doesn't prove the IP is clean — it just means none of our public-feed sources flag it.
Co-Hosted Domains
Domains this host references in its HTML AND whose DNS A/AAAA record resolves back to this IP — i.e. actually hosted here.
External References
Domains the body links to whose DNS does NOT resolve to this IP — usually CDN assets, embeds, or third-party services. Boilerplate (Google Fonts, jsDelivr, w3.org…) is already filtered.
History
Historical change-log pending
ASN changes, prefix re-allocations, cert rotations, port-state diffs over months — accumulates as our archives grow.