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.
- Baseline (neutral) 65
- Trust score 65 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 66.103.158.0/24 | 256 |
0.0%
|
Arcosa, Inc. | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS400321 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 66.103.158.0/24 | 8,803 | 2026-07-23 15:47:38 |
Frequently Asked Questions
What is AS400321?
AS400321 is an Autonomous System Number assigned to Arcosa, Inc.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS400321 announce?
AS400321 announces 256 IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Brazil.
Who operates AS400321?
AS400321 is operated by Arcosa, Inc.. The organization is based in Brazil. You can view all IP ranges and related ASNs on the organization page.
What country is AS400321 registered in?
AS400321 is registered in Brazil. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
