AS4043
Montana Internet Corporation
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
- Isp allocation +5
- Trust score 70 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 1 internet exchange: SIX Seattle: MTU 1500
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS4043 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 |
|---|---|---|
| 209.161.128.0/19 | 4,690 | 2026-07-24 16:42:37 |
| 199.5.172.0/24 | 4,686 | 2026-07-24 16:42:37 |
| 206.127.64.0/18 | 4,684 | 2026-07-24 16:42:37 |
| 205.207.148.0/23 | 4,382 | 2026-07-24 16:42:37 |
Frequently Asked Questions
What is AS4043?
AS4043 is an Autonomous System Number assigned to Montana Internet Corporation. 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 AS4043 announce?
AS4043 announces 25.3K IPv4 addresses distributed across 29 routed CIDR prefixes. The network is registered in United States.
Who operates AS4043?
AS4043 is operated by Montana Internet Corporation. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS4043 registered in?
AS4043 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
