129.6.15.28
129.6.15.28 is an IPv4 address operated by National Institute of Standards and Technology (AS49), geolocated to Gaithersburg, United States. It is known as NIST Time Server (time-a-g). Its reverse DNS name is time-a-g.nist.gov. As of November 6, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.
⭐ NIST Time Server (time-a-g)
time-a-g.nist.gov — US National Institute of Standards and Technology time server in Gaithersburg — operated by NIST.
🏢 Ownership & Registration
| Organization | National Institute of Standards and Technology |
| ASN | AS49 |
| Network Name | NIST-G |
| CIDR Block | 129.6.0.0/16 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | time-a-g.nist.gov |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | time-a-g.nist.gov |
🔐 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 | Unknown — Insufficient routing data to classify |
🔌 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
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS49 |
| Network Prefix | 129.6.15.0/24 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 50% | 2 | 3 |
| routing | 25% | 1 | 1 |
| services | 35% | 2 | 2 |
| ownership | 50% | 2 | 3 |
| reputation | 25% | 1 | 1 |
| geolocation | 35% | 2 | 2 |
| Overall | 36% | 10 | 12 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-11-06 23:26:02 UTC |
| Last Seen | 2026-11-06 23:26:02 UTC |
| Profile Built | 2026-11-06 23:33:19 UTC |
| Data Freshness | Live |
| Signal Types | 17 |
| Total Observations | 17 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 129.6.15.28
Who owns the IP address 129.6.15.28?
129.6.15.28 is registered to National Institute of Standards and Technology. The address falls within the 129.6.0.0/16 network block. Registration is held at ARIN.
Where is 129.6.15.28 located?
Geolocation data places 129.6.15.28 in Gaithersburg, Maryland, United States. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 129.6.15.28 malicious or safe?
129.6.15.28 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 129.6.15.28?
The reverse DNS (PTR) record for 129.6.15.28 is time-a-g.nist.gov. This hostname is forward-confirmed, meaning it resolves back to the same address.