Addresses
1,048,576
1.05M
Sub-ranges
50+
within this block
PTR Density
100.0%
1.05M of 1.05M IPs have PTR
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
73/100
Moderate
How this score is built
- Baseline (neutral) 65
- Has a reverse-DNS (PTR) record +5
- Established allocation (8y) +3
- Trust score 73 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Ranges inside 3.128.0.0/12
Geolocation
First 256 of 1,048,576 IP addresses in 3.128.0.0/12
3.128.0.0
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+ 1.05M more (range too large to list inline)
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 3.128.0.0/10.
Announced prefix
Origin AS
Announcement samples
5,051
Last seen
2026-07-18 09:15:45
RIR Ownership History
Atom feed ⇲Allocation changes captured weekly from regional internet registry (RIR) delegation files.
| Date | Event | From | To |
|---|---|---|---|
| 2026-05-10 | New Allocation | — | US |
Frequently Asked Questions
What is 3.128.0.0/12?
3.128.0.0/12 is a CIDR network block containing 1,048,576 IPv4 addresses (from 3.128.0.0 to 3.143.255.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 3.128.0.0/12 network?
The 3.128.0.0/12 range is allocated to Amazon.com, Inc. and announced via AS16509 from United States.
Last updated: 2026-07-18 09:25:30 UTC
