51.21.194.148
51.21.194.148 is an IPv4 address operated by AMAZON-02 - Amazon.com, Inc., US (AS16509), with approximate network location Stockholm, Sweden. As of November 15, 2026, IPDebrief rates it Low Risk (10/100); no anonymizing service was detected.
🏢 Ownership & Registration
| Registered holder | IP Man |
| ASN | AS16509 |
| Network Name | EC2-ARN |
| CIDR Block | 51.21.0.0/16 |
| RIR | ARIN |
| Network registration country | SE |
| Routing operator | AMAZON-02 - Amazon.com, Inc., US |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR Record | No PTR |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
DNS Posture
Results describe the queried names. SPF, DMARC and CAA are domain policies, not requirements for every IP. DNSSEC here describes reverse DNS; inconclusive validation does not mean unsigned.
Not assessed: 0 conclusive IP DNS checks.
| caa | Not found at queried name com |
| spf | Not checked |
| dmarc | Not checked |
| dnssec | Unknown / lookup inconclusive 148.194.21.51.in-addr.arpa |
| fcrDns | Not checked |
☁️ Network Classification
| Infrastructure | Unknown |
| Service Purpose | Firewalled / No Services |
| Network Tier | Tier 3 — Basic operator with some routing infrastructure |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS16509 |
| Network Prefix | 51.21.0.0/16 |
| Route mapping | Found |
| RPKI Status | Valid |
📅 Observation Timeline 🔄 Recent
| First Seen | 2026-10-14 21:11:03 UTC |
| Last Seen | 2026-11-03 18:20:54 UTC |
| Profile Built | 2026-11-15 03:59:14 UTC |
| Data Freshness | Recent |
| Signal Types | 22 |
| Total Observations | 28 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 51.21.194.148
Who owns the IP address 51.21.194.148?
51.21.194.148 is registered to IP Man. The address falls within the 51.21.0.0/16 network block. Registration is held at ARIN.
Where is 51.21.194.148 located?
Geolocation data places 51.21.194.148 in Stockholm, Stockholm County, Sweden. The local time zone is Europe/Stockholm. IP geolocation is approximate, not a precise physical address. Registration country and certificate organization addresses do not establish service location.
Is 51.21.194.148 malicious or safe?
51.21.194.148 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.