139.219.146.90
IP Intelligence Briefing: 139.219.146.90
*Generated via IPDebrief Threat Intelligence Platform*
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**1. Core Profile**
- Risk Score: 25 (Low Risk)
- Owner: Yuyan Liu (AS58593, ARIN-registered)
- Geolocation: Shanghai, China (latitude 31.0442, longitude 121.4054)
- Network Role: Cloud infrastructure (linked to "BLUECLOUD")
- Threat Indicators: No malicious activity detected; no known campaigns, blacklists, or spam sources.
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**2. Historical Observations**
- Last 30 Days:
- Stable geolocation in Shanghai, China.
- ICMP validation blocked, limiting network probing accuracy.
- Subnet abuse density: 0.5 (mostly clean, but 2 threat siblings in /24).
- No persistent malicious behavior or threat persistence.
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**3. Network Relationships**
- Key Associations:
- Linked to BLUECLOUD (same network).
- DNS records point to Microsoft Outlook email services (e.g., `mail-sh0chn02on2090.outbound.protection.partner.outlook.cn`).
- No SPF records, but DMARC enabled.
- Network Classification: Cloud-hosted, no CDN/VPN/proxy indicators.
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**4. Subnet Analysis**
- Subnet: 139.219.146.0/24
- Neighbor Risk:
- 3 IPs in subnet (139.219.146.91, 139.219.146.137, 139.219.146.138).
- Risk scores: 25, 0, 25 (low to moderate).
- Abuse Density: 0% (clean, but 2 threat siblings detected).
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**5. Threat Context**
- No Direct Threats: No malware, phishing, or spam indicators.
- Subnet Caution: While the IP itself is low-risk, the subnet contains 2 higher-risk siblings. Monitor for lateral movement or shared infrastructure compromises.
- DNS Validity: DNSSEC and CAA records present, but no email authentication (SPF) detected.
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**6. Recommended Actions**
1. Monitor Subnet: Track changes in abuse density and threat siblings.
2. Validate DNS: Confirm legitimacy of Outlook email services tied to this IP.
3. Baseline ICMP: Consider allowing limited ICMP probing for network health checks.
4. Cloud Provider Check: Verify "BLUECLOUD" infrastructure for any known vulnerabilities or compromises.
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*End of Briefing*
*Generated by IPDebrief | © 2026 Jason Alberino*
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Yuyan Liu |
| ASN | AS58593 |
| Network Name | — |
| CIDR Block | — |
| RIR | ARIN |
| Country | — |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | mail-sh0chn02on2090.outbound.protection.partner.outlook.cn |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | mail-sh0chn02on2090.outbound.protection.partner.outlook.cn |
🔐 DNS Hygiene
| Hygiene Score | 80% (Excellent) |
| SPF | Not configured |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Valid |
| CAA | Present |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Firewalled / No Services |
| Network Tier | Tier 3 — Basic operator with some routing infrastructure |
🔌 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 | 19% | 2 | 2 |
| routing | 13% | 1 | 1 |
| services | 8% | 1 | 1 |
| ownership | 24% | 2 | 3 |
| reputation | 15% | 1 | 2 |
| geolocation | 30% | 2 | 3 |
| Overall | 18% | 9 | 12 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-05-07 23:03:40 UTC |
| Last Seen | 2026-06-22 14:06:39 UTC |
| Profile Built | 2026-06-22 14:18:31 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 23 |
Full dossier details are available via our API.