100.15.205.21
IP Intelligence Dossier
Your IP: 216.73.216.157
🏢 Ownership & Registration
| Organization | Verizon Business |
| ASN | AS701 |
| Network Name | V4-VZO |
| CIDR Block | 100.0.0.0/12 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | pool-100-15-205-21.washdc.fios.verizon.net |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | pool-100-15-205-21.washdc.fios.verizon.net |
🔐 DNS Hygiene
| Hygiene Score | 60% (Good) |
| SPF | Present |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Not signed |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Firewalled / No Services |
| Network Tier | End-User — Residential ISP endpoint |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| Closed Ports | 22, 25, 80, 443, 3389, 8080, 8443 (0 open / 7 scanned) | ||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
No certificate
Issued by —
N/A
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS701 |
| Network Prefix | 100.15.0.0/16 |
| Route mapping | Found |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-10-04 06:03:05 UTC |
| Last Seen | 2026-10-04 06:03:05 UTC |
| Profile Built | 2026-10-04 06:11:32 UTC |
| Data Freshness | Live |
| Signal Types | 15 |
| Total Observations | 16 |
🔍 15 signal types · 16 observations collected
This report is generated from 15+ independent intelligence signals including
ownership records, DNS analysis, BGP routing, TLS certificates, port scanning, threat feeds,
behavioral fingerprinting, and more.
Full dossier details are available via our API.
Full dossier details are available via our API.
❓ Frequently Asked Questions About 100.15.205.21
Who owns the IP address 100.15.205.21?
100.15.205.21 is registered to Verizon Business. The address falls within the 100.0.0.0/12 network block. Registration is held at ARIN.
Where is 100.15.205.21 located?
Geolocation data places 100.15.205.21 in Washington, DC, United States. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 100.15.205.21 malicious or safe?
100.15.205.21 currently carries a low risk assessment, meaning no significant threat indicators have been observed. This assessment is generated from continuously collected signals and can change over time.
What is the hostname for 100.15.205.21?
The reverse DNS (PTR) record for 100.15.205.21 is pool-100-15-205-21.washdc.fios.verizon.net. This hostname is forward-confirmed, meaning it resolves back to the same address.
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ℹ️ About This Report
All data shown is publicly available network metadata — IP addresses do not reliably identify individuals.
Assessments are probabilistic and should not be used as sole basis for access control decisions.
To report an issue or request data review, contact admin@ipdebrief.com.