# 171.231.182.136 — IP Intelligence Summary 171.231.182.136 is an IPv4 address operated by IRT-VNNIC-AP (AS7552), geolocated to Da Nang, Vietnam. Its reverse DNS name is dynamic-adsl.viettel.vn. As of October 4, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected. - Canonical page: https://ipdebrief.com/171.231.182.136 - Last updated: 2026-10-04 ## Ownership - Organization: IRT-VNNIC-AP - Network name: VIETTEL-VN - Allocated block: 171.224.0.0/11 - ASN: AS7552 (https://ipdebrief.com/asn/7552) - Regional registry: APNIC ## Location - City: Da Nang - Region: Da Nang - Country: Vietnam - Time zone: Asia/Ho_Chi_Minh ## Network classification - Infrastructure type: — - Datacenter / hosting: no - Residential: no - Mobile: no - Anycast: no - Tor exit node: no - VPN: no - Proxy: no ## Risk assessment - Assessment: Low Risk (0/100) - Blocklist listings: 0 - Suspicious activity indicators: no - Spam source: no ## Reverse DNS - dynamic-adsl.viettel.vn - Forward-confirmed: no ## Analyst narrative \# IP Intelligence Briefing: 171.231.182.136 **Classification:** Low Risk / Residential ISP Infrastructure **Date:** 2026-07-25 **Analyst:** IPDebrief Intelligence Team \--- \## Executive Summary The target IP address 171.231.182.136 is a Vietnamese residential broadband address belonging to Viettel Corp. The IP presents a low-risk profile with a risk score of 25/100. No active threat indicators were detected during analysis, and the address shows no evidence of malicious activity. The IP is classified as firewalled with no open services. \--- \## Network Ownership & Infrastructure **Organization:** IRT-VNNIC-AP (Vietnam Internet Registration and Management Authority) **ASN:** 7552 **Network Block:** 171.224.0.0/11 **Country:** Vietnam (VN) **City:** Da Nang **Region:** Da Nang **DNS PTR:** dynamic-adsl.viettel.vn The IP is part of Viettel's residential broadband infrastructure. The dynamic hostname pattern indicates a customer-facing consumer broadband address rather than enterprise infrastructure. \--- \## Risk Assessment **Overall Risk Score:** 25/100 (Low Risk) **Provider Score:** 0/50 **Authority Score:** 0/50 **Stability Score:** 0/50 **Risk Indicators:** \- No active threat indicators detected \- Not classified as Tor exit node, proxy, CDN, or hosting service \- No known attacker attribution \- No spam source classification \- Zero blacklists matched during scan (0/8) **Control Plane Observations:** \- Route stability flagged as unstable \- DNSSEC validation: Valid \- Operator score: 0.1304 (Minimal) \- DNSBL listing count: 1 (minor listing) \--- \## Network Neighborhood Analysis **Subnet:** 171.231.182.0/24 **Total Siblings:** 8 **Abuse Density:** 0.25 (Low-Moderate) **Classification:** Mixed **Neighbor Risk Distribution:** \- High Risk: 0 IPs \- Medium Risk: 2 IPs \- Low Risk: 5 IPs **Notable Neighbors:** \- 171.231.182.74 (Risk: 49/100) - Medium risk \- 171.231.182.206 (Risk: 50/100) - Medium risk \- 171.231.182.136 (Risk: 25/100) - Target IP The subnet shows mixed usage patterns with two medium-risk siblings detected. No high-risk concentration observed. \--- \## Observation History **Total Signals Observed:** 17 **Time Range:** Recent monitoring period **Threat Observations:** 1 (non-persistent) **Ownership Changes:** 0 **Key Historical Signals:** \- Geolocation consistently resolved to Vietnam (Da Nang region) \- One threat observation recorded \- No persistent malicious activity detected \- Subnet abuse density maintained at 0.25 The IP shows stable ownership with no history of persistent malicious behavior. \--- \## Relationships & Connections **Total Relationships Identified:** 10 **Network Associations:** 5 relationships to VIETTEL-VN network **DNS Associations:** 5 relationships to dynamic-adsl.viettel.vn The IP demonstrates expected DNS associations for a residential broadband connection. No anomalous relationships to external threat actors or malicious infrastructure were detected. \--- \## Technical Observations **Services:** None detected (Firewalled / No Services) **Open Ports:** None **TLS Certificates:** None **HTTP/HTTPS:** No active web services **Email Authentication:** \- SPF: Configured \- DMARC: Configured \- Domain: viettel.vn **Fingerprinting:** \- No HTTP headers indicating specific application servers \- No HSTS or CSP headers present \- Standard residential broadband behavior \--- \## Threat Indicators Summary \- **Is Tor Exit Node:** No \- **Is Known Attacker:** No \- **Is Spam Source:** No \- **Blacklist Count:** 0 \- **Associated Campaigns:** None \- **Cert Matches:** 0 \- **Banner Matches:** 0 \--- \## Recommendations **Immediate Actions:** None required. The IP presents no active threat indicators and shows standard residential broadband behavior. **Monitoring Considerations:** \- Continue monitoring subnet 171.231.182.0/24 for emerging threat patterns \- Two medium-risk neighbors (171.231.182.74, 171.231.182.206) warrant periodic review \- Route stability issues may indicate infrastructure changes **Firewall Rules:** No blocking recommended. The IP is a legitimate residential infrastructure address with low-risk classification. \--- \## Conclusion IP 171.231.182.136 is a legitimate Vietnamese residential broadband address with no active malicious indicators. The low risk score (25/100), absence of threat indicators, and stable ownership profile indicate this should be treated as normal consumer traffic. No defensive actions are currently warranted. ## Nearby addresses - 171.231.182.9 (https://ipdebrief.com/171.231.182.9) - 171.231.182.15 (https://ipdebrief.com/171.231.182.15) - 171.231.182.26 (https://ipdebrief.com/171.231.182.26) - 171.231.182.60 (https://ipdebrief.com/171.231.182.60) - 171.231.182.63 (https://ipdebrief.com/171.231.182.63) - 171.231.182.74 (https://ipdebrief.com/171.231.182.74) - 171.231.182.114 (https://ipdebrief.com/171.231.182.114) - 171.231.182.143 (https://ipdebrief.com/171.231.182.143) - 171.231.182.149 (https://ipdebrief.com/171.231.182.149) - 171.231.182.175 (https://ipdebrief.com/171.231.182.175) - 171.231.182.182 (https://ipdebrief.com/171.231.182.182) - 171.231.182.200 (https://ipdebrief.com/171.231.182.200) --- Source: IPDebrief, "171.231.182.136 IP intelligence", https://ipdebrief.com/171.231.182.136, updated 2026-10-04. Assessments are probabilistic.