100.15.4.187
100.15.4.187 is an IPv4 address announced by AS701, with approximate network location Waldorf, United States. It belongs to a residential connection with reverse DNS name pool-100-15-4-187.washdc.fios.verizon.net. As of October 8, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.
🏢 Ownership & Registration
| Registered holder | Verizon Business |
| ASN | AS701 |
| Network Name | V4-VZO |
| CIDR Block | 100.0.0.0/12 |
| RIR | ARIN |
| Network registration country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | pool-100-15-4-187.washdc.fios.verizon.net |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | pool-100-15-4-187.washdc.fios.verizon.net |
DNS Posture
Results describe the queried names. SPF, DMARC and CAA are domain policies, not requirements for every IP. DNSSEC here describes reverse DNS; inconclusive validation does not mean unsigned.
Not assessed: 0 conclusive IP DNS checks.
| spf | Not checked |
| dmarc | Not checked |
| fcrDns | Not checked |
| dnssec | Not checked |
| caa | Not checked |
☁️ Network Classification
| Infrastructure | Residential |
| Service Purpose | Residential Endpoint |
| Network Tier | End-User — Residential ISP endpoint |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| 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 | 2026-10-08 15:08:58 UTC |
| Last Seen | 2026-10-08 15:08:58 UTC |
| Profile Built | 2026-10-08 15:14:12 UTC |
| Data Freshness | Live |
| Signal Types | 13 |
| Total Observations | 13 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 100.15.4.187
Who owns the IP address 100.15.4.187?
100.15.4.187 is registered to Verizon Business. The address falls within the 100.0.0.0/12 network block. Registration is held at ARIN.
Where is 100.15.4.187 located?
Geolocation data places 100.15.4.187 in Waldorf, MD, United States. The local time zone is America/New_York. IP geolocation is approximate, not a precise physical address. Registration country and certificate organization addresses do not establish service location.
Is 100.15.4.187 malicious or safe?
100.15.4.187 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 100.15.4.187?
The reverse DNS (PTR) record for 100.15.4.187 is pool-100-15-4-187.washdc.fios.verizon.net. This hostname is forward-confirmed, meaning it resolves back to the same address.
Is 100.15.4.187 a VPN, proxy, or data center address?
100.15.4.187 is classified as a residential network based on network ownership and behavioural analysis.