51.183.21.4
🏢 Ownership & Registration
| Organization | Sky UK Broadband Hostmaster |
| ASN | AS5607 |
| Network Name | SKY-BROADBAND |
| CIDR Block | 51.182.0.0/15 |
| RIR | ARIN |
| Country | IE |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | 33b71504.skybroadband.com |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | 33b71504.skybroadband.com |
🔐 DNS Hygiene
| Hygiene Score | 80% (Excellent) |
| SPF | Present |
| DMARC | Present |
| FCrDNS | Verified |
| DNSSEC | Valid |
| 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 | AS5607 |
| Network Prefix | 51.183.0.0/18 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 35% | 2 | 2 |
| routing | 25% | 1 | 1 |
| services | 25% | 1 | 1 |
| ownership | 0% | 0 | 0 |
| reputation | 25% | 1 | 1 |
| geolocation | 25% | 1 | 1 |
| Overall | 22% | 6 | 6 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-07-10 14:02:22 UTC |
| Last Seen | 2026-08-31 23:17:02 UTC |
| Profile Built | 2026-08-31 23:18:05 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 21 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 51.183.21.4
Who owns the IP address 51.183.21.4?
51.183.21.4 is registered to Sky UK Broadband Hostmaster. The address falls within the 51.182.0.0/15 network block. Registration is held at ARIN.
Where is 51.183.21.4 located?
Geolocation data places 51.183.21.4 in Dublin, Leinster, Ireland. The local time zone is Europe/Dublin. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 51.183.21.4 malicious or safe?
51.183.21.4 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 51.183.21.4?
The reverse DNS (PTR) record for 51.183.21.4 is 33b71504.skybroadband.com. This hostname is forward-confirmed, meaning it resolves back to the same address.
Is 51.183.21.4 a VPN, proxy, or data center address?
51.183.21.4 is classified as a residential network based on network ownership and behavioural analysis.