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
- Active-threat / abuse risk −12
- Trust score 53 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
⚠ 1 MOAS prefix — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS21581 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 207.158.52.0/24 | AS21581, AS198474 | 2026-09-11 13:25:55 |
Network profile
Source: PeeringDB →Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21581 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 |
|---|---|---|
| 38.96.14.0/24 | 35,629 | 2026-09-11 13:18:06 |
| 108.161.144.0/24 | 30,859 | 2026-09-11 13:16:58 |
| 108.161.151.0/24 | 30,762 | 2026-09-11 13:16:58 |
| 108.161.146.0/24 | 30,735 | 2026-09-11 13:16:58 |
| 206.71.169.0/24 | 27,341 | 2026-09-11 13:22:01 |
| 206.71.179.0/24 | 27,329 | 2026-09-11 13:22:01 |
| 206.71.190.0/24 | 27,020 | 2026-09-11 13:22:01 |
| 108.161.145.0/24 | 26,538 | 2026-09-11 13:16:58 |
| 108.161.144.0/20 | 26,524 | 2026-08-30 02:29:26 |
| 108.161.148.0/24 | 26,522 | 2026-09-11 13:16:58 |
| 207.158.30.0/24 | 25,184 | 2026-09-11 13:22:01 |
| 209.216.230.0/24 | 25,136 | 2026-09-11 13:22:01 |
| 207.158.15.0/24 | 25,130 | 2026-09-11 13:22:01 |
| 207.158.37.0/24 | 25,092 | 2026-09-11 13:22:01 |
| 206.251.255.0/24 | 25,051 | 2026-09-11 13:22:01 |
| 206.251.244.0/24 | 25,033 | 2026-09-11 13:22:01 |
| 207.158.52.0/24 | 24,648 | 2026-09-11 13:22:01 |
| 108.161.156.0/24 | 15,855 | 2026-09-11 13:16:58 |
Frequently Asked Questions
What is AS21581?
AS21581 is an Autonomous System Number assigned to M5 Computer Security. 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 AS21581 announce?
AS21581 announces 6.9K IPv4 addresses distributed across 17 routed CIDR prefixes. The network is registered in United States.
Who operates AS21581?
AS21581 is operated by M5 Computer Security. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS21581 registered in?
AS21581 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
