175.35.221.73
IP 175.35.221.73 is classified as a clean residential endpoint within the Optus Internet network (ASN 4804) in Australia with an overall risk score of zero. While forward-confirmed reverse DNS resolves to a legitimate hostname, DNS hygiene is rated poor due to the absence of SPF, DMARC, and DNSSEC records. The endpoint is attributed to a mobile connection via Singtel Optus, and the system recommends allowing traffic based on the lack of threat indicators. Stability is labeled as stable with no threat siblings detected in the immediate neighborhood.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Optus Internet |
| ASN | AS4804 |
| Network Name | OPTUSINTERNET-AU |
| CIDR Block | 175.32.0.0/13 |
| RIR | APNIC |
| Country | AU |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | n175-35-221-73.adl1.sa.optusnet.com.au |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | n175-35-221-73.adl1.sa.optusnet.com.au |
🔐 DNS Hygiene
| Hygiene Score | 20% (Poor) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Verified |
| DNSSEC | Not signed |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Residential |
| Service Purpose | Residential Endpoint |
| Network Tier | End-User — Residential ISP endpoint |
🔌 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 | AS4804 |
| Network Prefix | 175.35.0.0/16 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 25% | 1 | 1 |
| routing | 25% | 1 | 1 |
| services | 25% | 1 | 1 |
| ownership | 0% | 0 | 0 |
| reputation | 0% | 0 | 0 |
| geolocation | 25% | 1 | 1 |
| Overall | 16% | 4 | 4 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-11-04 16:07:36 UTC |
| Last Seen | 2026-11-04 16:07:36 UTC |
| Profile Built | 2026-11-04 16:19:45 UTC |
| Data Freshness | Live |
| Signal Types | 19 |
| Total Observations | 19 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 175.35.221.73
Who owns the IP address 175.35.221.73?
175.35.221.73 is registered to Optus Internet. The address falls within the 175.32.0.0/13 network block. Registration is held at APNIC.
Where is 175.35.221.73 located?
Geolocation data places 175.35.221.73 in Adelaide, South Australia, Australia. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 175.35.221.73 malicious or safe?
175.35.221.73 currently carries a low risk assessment, meaning no significant threat indicators have been observed. This assessment is generated from continuously collected signals and can change over time.
What is the hostname for 175.35.221.73?
The reverse DNS (PTR) record for 175.35.221.73 is n175-35-221-73.adl1.sa.optusnet.com.au. This hostname is forward-confirmed, meaning it resolves back to the same address.
Is 175.35.221.73 a VPN, proxy, or data center address?
175.35.221.73 is classified as a mobile network and a residential network based on network ownership and behavioural analysis.