221.10.21.25
IP Intelligence Briefing: 221.10.21.25/32
Date: 2026-06-18
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**1. Core Profile**
- Risk Score: 40 (Moderate Risk)
- Provider: China Unicom (ASN 4837)
- Ownership: Registered to *Xifei Xie* under *UNICOM-SC* (APNIC).
- Geolocation: China (P.R. China), latitude/longitude unspecified.
- Network Role: Mobile device (LTE/5G), no public services or hosting.
- Threat Indicators: No malicious activity detected (no malware, spam, or known attacker associations).
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**2. Observation History**
- Signal Consistency: Minimal risk signals observed over the past 30 days.
- Key Trends:
- Stable network configuration with no recent ownership changes.
- Low threat persistence (0 malicious observations).
- DNSSEC and CAA records validated, but no email authentication (SPF/DKIM) detected.
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**3. Relationships**
- Network Affiliation: Linked to *UNICOM-SC* (APNIC) and China Unicom.
- Subnet: Part of *221.10.0.0/16*, with 2 active siblings.
- Neighbors:
- 221.10.21.26: Risk score 25 (low risk, but flagged in abuse density).
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**4. Neighborhood Analysis**
- Subnet: *221.10.21.25/24*
- Abuse Density: 1 (low risk, but one neighbor (221.10.21.26) shows moderate risk).
- Recommendation: Monitor subnet for unusual activity, particularly 221.10.21.26.
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**5. Actionable Insights**
- SOC Analyst Guidance:
- No immediate mitigation required for 221.10.21.25, but monitor its subnet for lateral movement.
- Investigate 221.10.21.26 if it exhibits suspicious behavior (e.g., DNS anomalies, unexpected traffic).
- Verify if the IP is part of a larger mobile network segment (e.g., enterprise or carrier-managed).
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End of Briefing
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Xifei Xie |
| ASN | AS4837 |
| Network Name | UNICOM-SC |
| CIDR Block | 221.10.0.0/16 |
| RIR | APNIC |
| Country | CN |
| 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 | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Present |
☁️ Network Classification
| Infrastructure | Mobile |
| Service Purpose | Firewalled / No Services |
| Network Tier | Unknown — Insufficient routing data to classify |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| 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 | 26% | 2 | 3 |
| routing | 15% | 2 | 2 |
| services | 11% | 1 | 2 |
| ownership | 27% | 2 | 3 |
| reputation | 23% | 1 | 3 |
| geolocation | 21% | 2 | 2 |
| Overall | 21% | 10 | 15 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:04:13 UTC |
| Last Seen | 2026-06-23 08:36:39 UTC |
| Profile Built | 2026-06-23 08:42:26 UTC |
| Data Freshness | Live |
| Signal Types | 21 |
| Total Observations | 23 |
Full dossier details are available via our API.