100.29.131.129
Intelligence Briefing: 100.29.131.129/32
Overview
The IP address 100.29.131.129/32 was assessed as a low-risk host (Risk Score 25) associated with Amazon Web Services infrastructure located in Ashburn, Virginia. The address resides within the 100.24.0.0/13 CIDR block assigned to Amazon Data Services Northern Virginia (ASN 14618).
Technical Details
Reverse DNS resolution identified the PTR hostname as ec2-100-29-131-129.compute-1.amazonaws.com. Active scanning revealed TCP port 443 open, responding with an `awselb/2.0` banner. TLS certificate inspection confirmed the subject was issued for the `*.classlink.com` domain family. DNS hygiene checks indicated valid SPF and DMARC records were configured for the associated domain.
Threat Assessment
Threat intelligence feeds reported no known attacker activity, zero spam sources, and no active campaigns linked to the address. The neighborhood analysis classified the subnet as clean with minimal abuse density. While control plane data noted a single DNSBL listing, the primary threat assessment maintained a blacklist count of zero with no specific classification. Operational confidence in the current data was rated very low (0.125).
Recommendation
The recommended action was monitoring with low severity. No immediate firewall rules were required, but the asset should be observed for changes in behavior or reputation shifts.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Amazon Data Services Northern Virginia |
| ASN | AS14618 |
| Network Name | AMAZON-IAD |
| CIDR Block | 100.24.0.0/13 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | ec2-100-29-131-129.compute-1.amazonaws.com |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | ec2-100-29-131-129.compute-1.amazonaws.com |
🔐 DNS Hygiene
| Hygiene Score | 60% (Good) |
| SPF | Present |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Not signed |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Web Server |
| Network Tier | Unknown — Insufficient routing data to classify |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| 443 | https | tcp | — |
| Closed Ports | 22, 25, 80, 3389, 8080, 8443 (1 open / 7 scanned) | ||
| Server | awselb/2.0 |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | *.classlink.com*.internal.classlink.com*.apps.classlink.com*.apis.classlink.com |
| Valid From | 2025-12-02T00:00:00+00:00 |
| Valid Until | 2026-12-31T23:59:59+00:00 |
| TLS Protocol | Tls13 |
| Cipher Suite | TLS_AES_128_GCM_SHA256 |
| Signature Algorithm | sha256RSA |
| Validity Period | 394 days |
| Serial Number | 0793A2D224B0F9DFF347278B72A9EB34 |
| Thumbprint | FB8ED616F141235A5DF1A7AA06DBB87D93EEBB2C |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 0% | 0 | 0 |
| routing | 25% | 1 | 1 |
| services | 25% | 1 | 1 |
| ownership | 0% | 0 | 0 |
| reputation | 0% | 0 | 0 |
| geolocation | 25% | 1 | 1 |
| Overall | 12% | 3 | 3 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-09-07 17:16:02 UTC |
| Last Seen | 2026-09-07 17:16:02 UTC |
| Profile Built | 2026-09-07 20:04:43 UTC |
| Data Freshness | Live |
| Signal Types | 22 |
| Total Observations | 22 |
Full dossier details are available via our API.