27.156.3.21
IP Intelligence Briefing: 27.156.3.21
*Generated via IPDebrief Threat Intelligence Platform*
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**Core Profile**
- Risk Score: Moderate (50/100)
- Ownership: Registered to IRT-CHINANET-FJ (ASN 133774) under APNIC.
- Geolocation: China (CN), no specific city/region data.
- Network Role: Firewalled / No Services (no open ports or active TLS/HTTP services detected).
- Threat Indicators: No direct malicious activity detected (no malware, phishing, or known attacker associations).
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**Observation History**
- Recent Activity (2026-06-10):
- Listed in 8 threat feeds (confidence: 85%), though specific indicators are truncated.
- Associated with BNTCFD-FZ-FJ network (China Telecom Fujian IDC).
- DNS resolution tied to dynamic.163data.com.cn (likely residential/business ISP infrastructure).
- Stability: Route stability score indicates inconsistent routing (likely due to carrier network changes).
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**Network Relationships**
- DNS Associations:
- Linked to 21.3.156.27.broad.fz.fj.dynamic.163data.com.cn (repeated DNS resolution).
- Suggests potential residential or business network setup.
- Network Affiliation:
- Part of 27.156.0.0/20 subnet managed by CHINATELECOM-FUJIAN-FUZHOU-IDC1.
- No direct connections to known malicious subnets or organizations.
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**Subnet Analysis**
- Neighborhood:
- No active neighbors in the 27.156.3.21/24 subnet (likely a /32 address with no sibling IPs).
- Subnet abuse density: 0% (no malicious activity detected in the broader network).
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**Recommendations**
1. Monitor Threat Feeds: Track the IP’s inclusion in threat lists (e.g., DNSBLs) for potential shifts in risk.
2. Verify DNS Context: Investigate the dynamic.163data.com.cn hostname for residential/business network ties.
3. Network Segmentation: Ensure the IP’s firewalled status is enforced to prevent unauthorized access.
4. Route Stability: Confirm carrier routing stability for consistent connectivity.
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*No immediate action required. Maintain baseline monitoring for anomalies.*
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | IRT-CHINANET-FJ |
| ASN | AS133774 |
| Network Name | BNTCFD-FZ-FJ |
| CIDR Block | 27.156.0.0/17 |
| RIR | APNIC |
| Country | CN |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | 21.3.156.27.broad.fz.fj.dynamic.163data.com.cn |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | 21.3.156.27.broad.fz.fj.dynamic.163data.com.cn |
🔐 DNS Hygiene
| Hygiene Score | 20% (Poor) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| 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 | — |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 13% | 1 | 1 |
| routing | 13% | 1 | 1 |
| services | 13% | 1 | 1 |
| ownership | 27% | 2 | 3 |
| reputation | 0% | 0 | 0 |
| geolocation | 23% | 2 | 2 |
| Overall | 15% | 7 | 8 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-23 00:20:14 UTC |
| Last Seen | 2026-06-26 18:11:11 UTC |
| Profile Built | 2026-06-10 04:26:00 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 22 |
Full dossier details are available via our API.