151.101.193.91
151.101.193.91 is an IPv4 address operated by Fastly, Inc. (AS54113), geolocated to United States. As of October 30, 2026, IPDebrief rates it High Risk (70/100); no anonymizing service was detected.
Intelligence analysis identified IP 151.101.193.91 as associated with Fastly, Inc. (ASN 54113) within the SKYCA-3 network block. Although the infrastructure type is classified as a CDN, threat intelligence categorized this endpoint as campaign infrastructure with a high likelihood of involvement in coordinated attacks. The address received a High Risk reputation score of 70.
Service enumeration confirmed active HTTP and HTTPS listeners on ports 80 and 443. HTTP requests returned a Varnish server banner, and TLS certificates were issued by GlobalSign for the subject n.sni-347-default.ssl.fastly.net. Geolocation data indicated the United States, but physical validation contradicted this finding; a measured RTT of 15ms conflicted with the claimed distance of 7625km, which requires a minimum of 152.5ms. The IP was listed on one DNS blacklist.
The surrounding neighborhood (151.101.193.0/24) showed a mixed classification with an abuse density of 0.5238, including 11 identified threat siblings. Due to the high risk score and strong threat evidence, the assessment concluded a critical severity recommendation to block the address.
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 | 1/2 domains |
| DMARC | 2/2 domains |
| FCrDNS | Not verified |
| DNSSEC | Not signed |
| CAA | Not configured |
| Domains Checked | 2 domains |
☁️ 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 | Web server detected |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | n.sni-347-default.ssl.fastly.net |
| Valid From | 2026-09-04T05:16:07+00:00 |
| Valid Until | 2027-03-22T04:16:07+00:00 |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_128_GCM_SHA256 |
| Signature Algorithm | sha256RSA |
| Validity Period | 198 days |
🛡️ Public Network Snapshot
| Origin ASN | AS54113 |
| Network Prefix | 151.101.192.0/22 |
| Route mapping | Found |
| HSTS | Not detected |
| CSP | Not detected |
| HTTP/2 | Enabled |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 32% | 2 | 9 |
| routing | 8% | 1 | 1 |
| services | 24% | 2 | 4 |
| ownership | 20% | 2 | 4 |
| reputation | 25% | 1 | 8 |
| geolocation | 25% | 2 | 5 |
| Overall | 22% | 10 | 31 |
| Data Coherence | Mostly Consistent (80%) — 1 contradiction(s) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-09-29 20:02:52 UTC |
| Last Seen | 2026-10-30 17:58:26 UTC |
| Profile Built | 2026-10-30 18:07:56 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 44 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 151.101.193.91
Who owns the IP address 151.101.193.91?
151.101.193.91 is registered to Fastly, Inc.. The address falls within the 151.101.0.0/16 network block. Registration is held at RIPE.
Where is 151.101.193.91 located?
Geolocation data places 151.101.193.91 in United States. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 151.101.193.91 malicious or safe?
151.101.193.91 currently carries a high risk assessment, meaning indicators associated with malicious or abusive activity have been observed. This assessment is generated from continuously collected signals and can change over time.
What ports are open on 151.101.193.91?
Responsive ports observed on 151.101.193.91 include 80, 443. Port visibility reflects the most recent scan and may change as the host's configuration or firewall rules change.