# 171.231.187.59 — IP Intelligence Summary

171.231.187.59 is an IPv4 address operated by IRT-VNNIC-AP (AS7552), geolocated to Qui Nhon, Vietnam. Its reverse DNS name is dynamic-ip-adsl.viettel.vn. As of October 5, 2026, IPDebrief rates it Low Risk (25/100); no anonymizing service was detected.

- Canonical page: https://ipdebrief.com/171.231.187.59
- Last updated: 2026-10-05

## 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: Qui Nhon
- Region: 31
- 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: 171.231.187.59/32

**Classification:** Low Risk (Score: 25)

**Date:** 2026-07-27

**Prepared:** IPDebrief Intelligence Analysis

\---

\## Executive Summary

IP 171.231.187.59 is a residential/corporate dynamic IP address belonging to Viettel Vietnam's broadband infrastructure. The IP demonstrates low risk characteristics with no active threat indicators, no open services, and a clean neighborhood profile. No immediate defensive action required.

\---

\## Ownership and Infrastructure

\- **Organization:** IRT-VNNIC-AP (Viettel Vietnam)

\- **ASN:** 7552 (VIETTEL-VN)

\- **CIDR Block:** 171.224.0.0/11

\- **Location:** Da Nang, Vietnam (VN)

\- **Network Type:** Residential/ISP broadband (dynamic IP)

\- **Service Status:** Firewalled / No active services detected

\---

\## Threat Indicators Assessment

| Category | Status | Details |

|----------|--------|---------|

| **Risk Score** | 25/100 | Low Risk |

| **Abuse Confidence** | N/A | No indicators |

| **Blacklist Count** | 0 | Not listed on major feeds |

| **Tor Exit** | No | Not a Tor exit node |

| **Known Attacker** | No | No attack attribution |

| **Spam Source** | No | Not a spam source |

| **Campaigns** | None | No associated campaigns |

| **DNSBL Listings** | 1/8 | Minor listing present |

\---

\## Network Neighborhood Analysis

**Subnet:** 171.231.187.0/24

**Abuse Density:** 0% (Clean)

**Total Siblings:** 7

**Active Siblings:** 4

**Threat Siblings:** 0

**Neighbor Risk Distribution:**

\- High Risk: 0

\- Medium Risk: 0

\- Low Risk: 6

All neighboring IPs (171.231.187.28, 171.231.187.95, 171.231.187.124, 171.231.187.177, 171.231.187.202, 171.231.187.209) maintain similar low-risk profiles with no abuse density correlation.

\---

\## Observed Services and DNS

\- **PTR Hostname:** dynamic-ip-adsl.viettel.vn

\- **Forward Resolution:** dynamic-ip-adsl.viettel.vn

\- **Open Ports:** None detected

\- **TLS Certificate:** Not present

\- **HTTP Service:** Not active

\- **Email Authentication:** SPF and DMARC records present (viettel.vn)

\---

\## Temporal Behavior

\- **Ownership Stability:** No changes recorded

\- **Threat Persistence:** 0 days

\- **Threat Observations:** 0

\- **Control Plane:** Route stable, DNSSEC valid

\- **Historical Trend:** No escalation of risk signals observed

\---

\## SOC Analyst Recommendations

1. **Traffic Policy:** Monitor but no block required. Normal ISP broadband traffic pattern.

2. **Firewall Rules:** No specific rules recommended. Standard inbound filtering applies.

3. **Threat Hunting:** No active threat indicators warranting investigation.

4. **Relationship Monitoring:** Track associated hostname dynamic-ip-adsl.viettel.vn for broader context if needed.

5. **Priority:** LOW - No immediate action required.

\---

\## Evidence Summary

All indicators point to legitimate ISP infrastructure. The IP is part of Viettel's residential/corporate broadband allocation and shows no malicious activity patterns. The single DNSBL listing is minor and consistent with ISP network operations.

## Nearby addresses

- 171.231.187.28 (https://ipdebrief.com/171.231.187.28)
- 171.231.187.71 (https://ipdebrief.com/171.231.187.71)
- 171.231.187.95 (https://ipdebrief.com/171.231.187.95)
- 171.231.187.124 (https://ipdebrief.com/171.231.187.124)
- 171.231.187.149 (https://ipdebrief.com/171.231.187.149)
- 171.231.187.177 (https://ipdebrief.com/171.231.187.177)
- 171.231.187.199 (https://ipdebrief.com/171.231.187.199)
- 171.231.187.202 (https://ipdebrief.com/171.231.187.202)
- 171.231.187.209 (https://ipdebrief.com/171.231.187.209)
- 171.231.187.245 (https://ipdebrief.com/171.231.187.245)

---

Source: IPDebrief, "171.231.187.59 IP intelligence", https://ipdebrief.com/171.231.187.59, updated 2026-10-05. Assessments are probabilistic.