151.101.129.40
151.101.129.40 is an IPv4 address operated by Fastly, Inc. (AS54113), geolocated to San Mateo, United States. As of November 1, 2026, IPDebrief rates it Moderate Risk (40/100); no anonymizing service was detected.
🏢 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 | 5/6 domains |
| DMARC | 3/6 domains |
| FCrDNS | Not verified |
| DNSSEC | Not signed |
| CAA | Not configured |
| Domains Checked | 6 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
CN=perimeterx.net, O="PerimeterX, Inc.", L=San Mateo, S=California, C=US was found on this IP. This may indicate a previously hosted website, a decommissioned service, or stale infrastructure.| SANs | perimeterx.net*.perimeterx.net*.pxchk.net*.px-cdn.net*.a.pxi.pubwww.perimeterx.net |
| Valid From | 2026-03-16T00:00:00+00:00 |
| Valid Until | 2026-07-25T23:59:59+00:00 (expired) |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_128_GCM_SHA256 |
| Signature Algorithm | sha256RSA |
| Validity Period | 131 days |
🛡️ Public Network Snapshot
| Origin ASN | AS54113 |
| Network Prefix | 151.101.128.0/22 |
| 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 | 35% | 2 | 7 |
| routing | 17% | 2 | 3 |
| services | 27% | 2 | 5 |
| ownership | 19% | 3 | 4 |
| reputation | 28% | 1 | 5 |
| geolocation | 30% | 2 | 4 |
| Overall | 26% | 12 | 28 |
| Data Coherence | Mixed Signals (60%) — 2 contradiction(s) |
| Attribution | Very Low (20%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
⚠ Geo sources disagree on country: US, CA
📅 Observation Timeline 🔄 Live
| First Seen | 2026-09-29 12:34:09 UTC |
| Last Seen | 2026-11-01 20:50:45 UTC |
| Profile Built | 2026-11-01 21:18:00 UTC |
| Data Freshness | Live |
| Signal Types | 26 |
| Total Observations | 51 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 151.101.129.40
Who owns the IP address 151.101.129.40?
151.101.129.40 is registered to Fastly, Inc.. The address falls within the 151.101.0.0/16 network block. Registration is held at RIPE.
Where is 151.101.129.40 located?
Geolocation data places 151.101.129.40 in San Mateo, CA, United States. The local time zone is America/Los_Angeles. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 151.101.129.40 malicious or safe?
151.101.129.40 currently carries a moderate risk assessment, meaning some indicators warrant caution, but the evidence is mixed. This assessment is generated from continuously collected signals and can change over time.
What ports are open on 151.101.129.40?
Responsive ports observed on 151.101.129.40 include 80, 443. Port visibility reflects the most recent scan and may change as the host's configuration or firewall rules change.