151.101.3.4
Intelligence Briefing: IP 151.101.3.4/32
Subject: 151.101.3.4
Classification: Low Risk (Risk Score: 25)
Owner: Fastly, Inc. (ASN: 54113)
Role: CDN / Web Server
Summary:
Analysis identified the address as a legitimate Content Delivery Network infrastructure component. The host operated web services over TCP ports 80 and 443, utilizing HTTP/2.0 and returning a status code of 421. TLS certificates validated for certainly.com were present, and the server banner indicated a Varnish cache engine.
Threat Assessment:
The address was tagged as a "Suspicious Host" due to signal contradictions, though no active malicious campaigns or known attacker signatures were detected. Blacklist enumeration returned zero entries. Within the 151.101.3.4/24 neighborhood, one threat sibling was recorded among six active siblings, resulting in an abuse density of 0.1667.
Technical Anomalies:
Geolocation validation reported a contradiction where the claimed distance of 7,625.7 km conflicted with an observed round-trip time (RTT) of 12.0 ms. DNS hygiene was rated Fair, and several security headers including HSTS, CSP, and Referrer Policy were absent.
Recommendation:
Monitor. The action was assigned low severity due to the presence of signal contradictions regarding geolocation and RTT measurements. No immediate firewall rules were required, but continued observation is advised.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Fastly, Inc. |
| ASN | AS54113 |
| Network Name | SKYCA-3 |
| CIDR Block | 151.101.0.0/16 |
| RIR | RIPE |
| 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 | 40% (Fair) |
| SPF | Present |
| DMARC | Present |
| 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 | — |
| Closed Ports | 22, 25, 3389, 8080, 8443 (2 open / 7 scanned) | ||
| Server | Varnish |
| HTTP Title | — |
🔐 TLS Certificate
CN=www.certainly.com was found on this IP. This may indicate a previously hosted website, a decommissioned service, or stale infrastructure.| SANs | certainly.comwww.certainly.com |
| Valid From | 2026-08-27T07:36:54+00:00 |
| Valid Until | 2026-09-26T07:36:53+00:00 (expired) |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_128_GCM_SHA256 |
| Signature Algorithm | sha256RSA |
| Validity Period | 29 days |
| Serial Number | 781CC131CD7B1F56BA25996615325923B2C8 |
| Thumbprint | 850177CC98E5F2D72B9016036E36099E86A052F5 |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 43% | 2 | 5 |
| routing | 13% | 1 | 1 |
| services | 33% | 2 | 4 |
| ownership | 27% | 2 | 3 |
| reputation | 28% | 1 | 3 |
| geolocation | 19% | 2 | 2 |
| Overall | 27% | 10 | 18 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-09-12 23:48:56 UTC |
| Last Seen | 2026-09-26 14:07:49 UTC |
| Profile Built | 2026-09-26 14:19:03 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 30 |
Full dossier details are available via our API.