177.157.128.121
## INTELLIGENCE BRIEFING: 177.157.128.121/32
Classification: LOW RISK (Score: 15/100)
Date: 2026-07-23
Analyst: IPDebrief Intelligence Team
---
EXECUTIVE SUMMARY
IP 177.157.128.121 is a residential mobile IP address assigned to Brazil's telecommunications infrastructure. The address shows minimal threat indicators with a low risk score of 15. No active threat campaigns detected. Currently listed on 1 of 8 DNS blacklists with medium severity rating.
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OWNERSHIP & NETWORK ATTRIBUTES
| Attribute | Value |
|---|---|
| **Organization** | TELEFÔNICA BRASIL S.A |
| **ASN** | 18881 |
| **CIDR Block** | 177.156.0.0/14 |
| **Network Name** | 182607 |
| **RIR** | LACNIC |
| **Mobile Carrier** | TIM S.A. (TIM) |
| **Technology** | LTE/5G |
| **Connection Type** | Residential Mobile |
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GEOLOCATION DATA
| Field | Value |
|---|---|
| **Country** | Brazil (BR) |
| **Region** | São Paulo (SP) |
| **Coordinates** | -14.24°, -51.93° |
| **Accuracy** | 2,500 km radius |
| **Timezone** | America/Sao_Paulo |
*Note: Geographic coordinates inferred via multi-signal analysis with 52% confidence.*
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DNS & RESOLUTION ANALYSIS
- PTR Record: 177.157.128.121.dynamic.adsl.gvt.net.br
- Forward Resolution: Confirmed (1 hostname)
- DNSSEC Valid: Yes
- Hosted Domains: 0
- Email Authentication: No SPF/DMARC records configured
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THREAT INDICATORS
| Metric | Status |
|---|---|
| **Risk Score** | 15/100 (Low Risk) |
| **Blacklist Count** | 1 of 8 lists |
| **Known Attacker** | No |
| **Tor Exit Node** | No |
| **Spam Source** | No |
| **Abuse Confidence** | Not scored |
| **Threat Feeds** | None detected |
| **Campaign Matches** | 0 |
DNSBL Status: Listed on 1 blacklist (medium severity)
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SERVICE PROFILE
- Open Ports: None detected
- HTTP/HTTPS: No services accessible
- TLS Certificate: None
- Banner Grabs: None
- Service Classification: Firewalled / No Services
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NETWORK ROLE CLASSIFICATION
| Classification | Status |
|---|---|
| **Provider** | No |
| **CDN** | No |
| **Cloud** | No |
| **VPN** | No |
| **Proxy** | No |
| **Tor** | No |
| **Hosting** | No |
| **Mobile** | **Yes** |
| **Residential** | No |
| **Bogon** | No |
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OBSERVATION HISTORY (18 Signals)
Recent activity tracked from 2026-07-23:
1. Ownership Signal: Stable ownership, 0 changes observed
2. Subnet Analysis: Abuse density 1, classified as "mostly clean"
3. Geolocation: Consistent Brazil attribution via multi-signal inference
4. Blacklist Monitoring: 1 listing detected (medium severity)
5. Ownership Registration: LACNIC RIR, ASN 18881
Threat Persistence: 0 days
Persistently Malicious: False
Observation Count: 1 threat observation
---
RELATIONSHIP GRAPH (6 Connections)
- Same Network: 182607 (TELEFÔNICA BRASIL)
- DNS Associations: 177.157.128.121.dynamic.adsl.gvt.net.br (3 instances)
---
NEIGHBORHOOD ANALYSIS (177.157.128.0/24)
- Subnet Abuse Density: 0
- Classification: Mostly Clean
- Inherited Risk: 2/100
- Total Siblings: 1
- Active Siblings: 0
- Threat Siblings: 1
- Risk Distribution: High: 0, Medium: 0, Low: 0
---
RECOMMENDED ACTIONS
Status: No immediate firewall rules recommended. Risk score (15) below threshold for automated blocking.
Suggested Actions:
1. Monitor blacklist status for changes
2. Allow traffic unless specific threat indicators emerge
3. No immediate blocking required for defensive operations
---
CONCLUSION
IP 177.157.128.121 is a legitimate residential mobile address from Brazil's TELEFÔNICA BRASIL infrastructure. Current risk profile indicates low threat potential. The single DNS blacklist listing warrants periodic monitoring but does not justify immediate blocking. Traffic should be permitted with standard logging.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | TELEFÔNICA BRASIL S.A |
| ASN | AS18881 |
| Network Name | 182607 |
| CIDR Block | 177.156.0.0/14 |
| RIR | LACNIC |
| Country | BR |
| Abuse Contact | — |
🌐 DNS Intelligence
| PTR | 177.157.128.121.dynamic.adsl.gvt.net.br |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
| Forward Hostnames | 177.157.128.121.dynamic.adsl.gvt.net.br |
🔐 DNS Hygiene
| Hygiene Score | 20% (Poor) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Valid |
| CAA | Not configured |
☁️ 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 | |||
| Closed Ports | 22, 25, 80, 443, 3389, 8080, 8443 (0 open / 7 scanned) | ||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS18881 |
| Network Prefix | 177.157.128.0/19 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 25% | 2 | 3 |
| routing | 8% | 1 | 1 |
| services | 12% | 2 | 2 |
| ownership | 12% | 2 | 2 |
| reputation | 14% | 1 | 3 |
| geolocation | 12% | 2 | 2 |
| Overall | 14% | 10 | 13 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-07-04 23:31:29 UTC |
| Last Seen | 2026-08-28 20:14:02 UTC |
| Profile Built | 2026-08-29 02:26:50 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 25 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 177.157.128.121
Who owns the IP address 177.157.128.121?
177.157.128.121 is registered to TELEFÔNICA BRASIL S.A. The address falls within the 177.156.0.0/14 network block. Registration is held at LACNIC.
Where is 177.157.128.121 located?
Geolocation data places 177.157.128.121 in São Paulo, São Paulo, Brazil. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 177.157.128.121 malicious or safe?
177.157.128.121 currently carries a moderate risk assessment, meaning some indicators warrant caution, but the evidence is mixed. This assessment is generated from continuously collected signals and can change over time.
What is the hostname for 177.157.128.121?
The reverse DNS (PTR) record for 177.157.128.121 is 177.157.128.121.dynamic.adsl.gvt.net.br. This hostname is not forward-confirmed, so it should be treated as a weak signal.
Is 177.157.128.121 a VPN, proxy, or data center address?
177.157.128.121 is classified as a mobile network based on network ownership and behavioural analysis.