104.16.133.27
The IP address 104.16.133.27 was identified as part of the CLOUDFLARENET infrastructure (AS13335), owned by Cloudflare, Inc. Geolocation records placed the node in the United States within the Los Angeles timezone. Operational analysis confirmed the address served as a Content Delivery Network (CDN) and web server.
Network scans detected open TCP ports 80, 443, 8080, and 8443, indicating active HTTP and HTTPS services. TLS certificate data associated with the IP linked the endpoint to quizlet.com via a Let's Encrypt issuer.
Threat intelligence assessments returned a Low Risk rating with a risk score of 30. No indicators of compromise, blacklist entries, or known attacker affiliations were found. The address was not classified as a Tor exit node, VPN, or proxy.
Intelligence indicated this IP represented standard infrastructure traffic associated with third-party cloud services. SOC analysts classified connections from this address as expected benign activity requiring standard monitoring.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Cloudflare, Inc. |
| ASN | AS13335 |
| Network Name | CLOUDFLARENET |
| CIDR Block | 104.16.0.0/12 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR Record | No PTR |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
🔐 DNS Hygiene
| Hygiene Score | 0% (None) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Not signed |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| 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 | — |
| 8080 | http-alt | tcp | — |
| 8443 | https-alt | tcp | — |
| Closed Ports | 22, 25, 3389 (4 open / 7 scanned) | ||
| Server | cloudflare |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | ablink.account.quizlet.comablink.lifecycle.quizlet.comablink.newsletter.quizlet.comquizlet.com |
| Valid From | 2026-08-23T15:57:03+00:00 |
| Valid Until | 2026-11-21T15:57:02+00:00 |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_256_GCM_SHA384 |
| Signature Algorithm | sha384ECDSA |
| Validity Period | 89 days |
| Serial Number | 069518C8F4ECBF03FD338A121DCCA616B7C6 |
| Thumbprint | E70E72725E4757F9EFDCC11C4CCC4AB29BCCC500 |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 25% | 1 | 1 |
| routing | 25% | 1 | 1 |
| services | 25% | 1 | 1 |
| ownership | 0% | 0 | 0 |
| reputation | 0% | 0 | 0 |
| geolocation | 25% | 1 | 1 |
| Overall | 16% | 4 | 4 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-09-03 23:48:50 UTC |
| Last Seen | 2026-09-03 23:48:50 UTC |
| Profile Built | 2026-09-04 00:01:58 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 20 |
Full dossier details are available via our API.