# 171.231.191.15 — IP Intelligence Summary 171.231.191.15 is an IPv4 address operated by IRT-VNNIC-AP (AS7552), geolocated to Da Nang, Vietnam. Its reverse DNS name is dynamic-ip-adsl.viettel.vn. As of October 6, 2026, IPDebrief rates it Low Risk (25/100); no anonymizing service was detected. - Canonical page: https://ipdebrief.com/171.231.191.15 - Last updated: 2026-10-06 ## 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 (25/100) - Blocklist listings: 0 - Suspicious activity indicators: no - Spam source: no ## Reverse DNS - dynamic-ip-adsl.viettel.vn - Forward-confirmed: no ## Analyst narrative \# IP Intelligence Briefing: 171.231.191.15/32 **Classification:** Low Risk ISP Infrastructure **Date:** 2026-07-28 **Analyst:** IPDebrief SOC Intelligence \--- \## Executive Summary IP address 171.231.191.15 is a Vietnamese ISP-allocated address within Viettel's infrastructure. The IP exhibits low-risk characteristics with no active threat indicators detected. The address is classified as a dynamic residential/business ADSL endpoint with standard ISP firewalling in place. \--- \## Asset Profile **Network Ownership:** \- **ASN:** 7552 (IRT-VNNIC-AP) \- **Organization:** VIETTEL-VN \- **CIDR Block:** 171.224.0.0/11 \- **RIR:** APNIC \- **Abuse Contact:** hm-changed@vnnic.vn **Geolocation:** \- **Country:** Vietnam (VN) \- **Region:** Da Nang \- **Coordinates:** 14.06°N, 108.28°E \- **Accuracy Radius:** 600km (multi-signal inference) **DNS Resolution:** \- **PTR Record:** dynamic-ip-adsl.viettel.vn \- **Forward Resolution:** dynamic-ip-adsl.viettel.vn \- **Hosted Domains:** None \- **Email Auth:** SPF and DMARC records present **Network Classification:** \- **Role:** Firewalled / No Services \- **CDN:** No \- **Cloud:** No \- **VPN/Proxy:** No \- **Tor:** No \- **Hosting:** No \- **Mobile:** No \- **Residential:** Dynamic residential endpoint \--- \## Risk Assessment **Current Risk Score:** 25/100 (Low Risk) **Threat Indicators:** \- **Blacklist Status:** Not listed on any major DNSBLs \- **Known Attacker:** No \- **Spam Source:** No \- **Tor Exit Node:** No \- **Known Campaigns:** None associated **Network Role:** Standard ISP infrastructure with active firewalling. No open ports or services exposed. TLS certificates, HTTP services, or server banners not detected. \--- \## Observation History **Total Signals Observed:** 17 **Observation Period:** Recent (2026-07-28) **Key Historical Findings:** \- Geolocation signals consistently identify Vietnam (Da Nang) \- No ownership changes detected \- No threat persistence indicators \- Threat observation count: 0 \- IP is not classified as persistently malicious **Signal Confidence:** \- Ownership/ASN: 90% confidence \- Geolocation: 52-70% confidence (multi-signal inference) \- Network classification: 85% confidence \--- \## Network Relationships **Associated Entities (5):** \- **Network:** VIETTEL-VN (2 associations) \- **Hostnames:** dynamic-ip-adsl.viettel.vn (3 DNS associations) **Certificate/Hostname Associations:** None detected beyond ISP-branded dynamic DNS \--- \## Neighborhood Analysis **Subnet:** 171.231.191.15/24 **Total Siblings:** 9 active IPs **Abuse Density:** 0 (low threat concentration in subnet) **Neighbor Risk Distribution:** \- High Risk: 0 \- Medium Risk: 1 (171.231.191.230, score 50) \- Low Risk: 8 **Notable Neighbor:** 171.231.191.230 presents elevated risk (score 50) with authority score 50. All other neighbors show risk scores between 0-25. \--- \## Recommended Actions **Firewall/Routing:** \- No blocking required based on current risk profile \- Monitor for service exposure changes \- Consider rate-limiting if this IP initiates high-volume connections **Monitoring Parameters:** \- Track for changes in open ports or service banners \- Monitor DNS resolution changes \- Watch for blacklist additions \- Observe neighborhood IP 171.231.191.230 for correlation activities **Threat Intel:** \- Maintain watchlist entry for correlation purposes \- No immediate IOC (Indicator of Compromise) generated \- Standard ISP traffic baseline expected \--- \## Intelligence Conclusion IP 171.231.191.15 represents standard Viettel ISP infrastructure in Vietnam. The low risk score, absence of threat indicators, and consistent ISP DNS resolution indicate this is legitimate residential/business endpoint traffic. No immediate defensive action required beyond standard baseline monitoring. The subnet maintains low abuse density with one elevated-risk neighbor warranting periodic review. ## Nearby addresses - 171.231.191.7 (https://ipdebrief.com/171.231.191.7) - 171.231.191.39 (https://ipdebrief.com/171.231.191.39) - 171.231.191.55 (https://ipdebrief.com/171.231.191.55) - 171.231.191.56 (https://ipdebrief.com/171.231.191.56) - 171.231.191.67 (https://ipdebrief.com/171.231.191.67) - 171.231.191.85 (https://ipdebrief.com/171.231.191.85) - 171.231.191.93 (https://ipdebrief.com/171.231.191.93) - 171.231.191.101 (https://ipdebrief.com/171.231.191.101) - 171.231.191.102 (https://ipdebrief.com/171.231.191.102) - 171.231.191.139 (https://ipdebrief.com/171.231.191.139) - 171.231.191.142 (https://ipdebrief.com/171.231.191.142) - 171.231.191.186 (https://ipdebrief.com/171.231.191.186) --- Source: IPDebrief, "171.231.191.15 IP intelligence", https://ipdebrief.com/171.231.191.15, updated 2026-10-06. Assessments are probabilistic.