18.161.21.40
Intelligence analysis identified 18.161.21.40/32 as a low-risk host associated with Amazon.com, Inc. (AS16509). The infrastructure operated as an AWS CloudFront web server, resolving to server-18-161-21-40.bos50.r.cloudfront.net. Passive scans confirmed open TCP services on ports 80 and 443.
Threat assessments reported no active indicators, known campaigns, or Tor exit node status. While the threat feed showed zero blacklist counts, control plane data recorded one DNSBL listing. The associated /24 subnet maintained a clean classification with an abuse density of 0.0286. Validation data noted a contradiction between the reported Washington, US geolocation and RTT physics measurements, though the infrastructure remained mostly consistent. Analysts recommend monitoring the address with a low-severity classification, as no specific malicious behavior was attributed to the resource.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Amazon.com, Inc. |
| ASN | AS16509 |
| Network Name | AMAZON-CF |
| CIDR Block | 18.160.0.0/15 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | server-18-161-21-40.bos50.r.cloudfront.net |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | server-18-161-21-40.bos50.r.cloudfront.net |
🔐 DNS Hygiene
| Hygiene Score | 80% (Excellent) |
| SPF | Present |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Not signed |
| CAA | Present |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Web Server |
| Network Tier | Hosting — Infrastructure provider without advanced routing |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| 80 | http | tcp | — |
| 443 | https | tcp | — |
| Closed Ports | 22, 25, 3389, 8080, 8443 (2 open / 7 scanned) | ||
| Server | CloudFront |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 37% | 2 | 6 |
| routing | 13% | 1 | 1 |
| services | 27% | 2 | 4 |
| ownership | 27% | 2 | 3 |
| reputation | 22% | 1 | 4 |
| geolocation | 27% | 2 | 4 |
| Overall | 25% | 10 | 22 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Moderate (55%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-08-29 04:15:13 UTC |
| Last Seen | 2026-09-19 21:26:30 UTC |
| Profile Built | 2026-09-23 09:49:14 UTC |
| Data Freshness | Live |
| Signal Types | 25 |
| Total Observations | 41 |
Full dossier details are available via our API.