151.101.128.238
Intellectual Briefing: 151.101.128.238
The endpoint was attributed to Fastly, Inc. (ASN 54113) within the SKYCA-3 block (151.101.0.0/16). Network role analysis identified the host as a CDN Web Server. Risk assessment assigned a Low Risk reputation score of 25. While the threat actor type was classified as a "Suspicious Host" with a "Low" attribution confidence, no specific threat indicators or blacklist hits were recorded.
Service scans revealed open ports 80 (HTTP) and 443 (HTTPS). The server banner identified as Varnish, and TLS certificates corresponded to Squarespace domains issued by DigiCert. Geolocation data localized the IP to New York, US, but validation metrics flagged a contradiction between the claimed distance (7625.7km) and measured RTT (15ms).
The subnet neighborhood (151.101.128.238/24) maintained a clean classification with zero threat siblings. Due to signal contradictions, the recommended action was to monitor for changes with low severity.
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 | 3/4 domains |
| DMARC | 2/4 domains |
| FCrDNS | Not verified |
| DNSSEC | Not signed |
| CAA | Not configured |
| Domains Checked | 4 domains |
☁️ 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
| SANs | *.squarespace.comsquarespace.com*.campaign-preferences.comcampaign-preferences.com*.sqsp.netsqsp.net*.sqspcdn.comstatic1.1.sqspcdn.comstatic2.1.sqspcdn.comstatic1.2.sqspcdn.com |
| Valid From | 2026-02-10T00:00:00+00:00 |
| Valid Until | 2027-03-03T23:59:59+00:00 |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_128_GCM_SHA256 |
| Signature Algorithm | sha256RSA |
| Validity Period | 386 days |
| Serial Number | 0EF444771207F0A7402C48A640F83128 |
| Thumbprint | B4EBFD1EAAB11A0773BB9A3268BAD66A9DAEEB23 |
🎯 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 | 2026-09-06 15:00:34 UTC |
| Last Seen | 2026-09-15 03:43:29 UTC |
| Profile Built | 2026-09-15 03:56:29 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 33 |
Full dossier details are available via our API.