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 v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 6 internet exchanges: BBIX Tokyo, BBIX Amsterdam, BBIX Hong Kong, BBIX Singapore, BBIX US-West, JPNAP Osaka
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 218.45.64.0/19 | 8.2K |
0.0%
|
MCAT Ltd. | JP | — | — |
| 120.50.192.0/20 | 4.1K |
99.0%
|
MCAT Ltd. | JP | Hiroshima | Mihara |
| 133.247.240.0/20 | 4.1K |
97.6%
|
MCAT Ltd. | JP | Hiroshima | Mihara |
| 133.247.136.0/21 | 2.0K |
99.3%
|
MCAT Ltd. | JP | Hiroshima | Togōchi |
| 103.95.104.0/22 | 1.0K |
93.3%
|
MCAT Ltd. | JP | Hiroshima | Mihara |
| 133.88.88.0/22 | 1.0K |
95.3%
|
MCAT Ltd. | JP | Hiroshima | Togōchi |
| 219.100.156.0/22 | 1.0K |
95.0%
|
MCAT Ltd. | JP | Hiroshima | Mihara |
| 133.88.92.0/23 | 512 |
96.7%
|
MCAT Ltd. | JP | Hiroshima | Mihara |
| 133.88.87.0/24 | 256 |
0.0%
|
MCAT Ltd. | JP | — | — |
| 133.88.94.0/24 | 256 |
96.5%
|
MCAT Ltd. | JP | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS131923 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 |
|---|---|---|
| 133.88.94.0/24 | 5,472 | 2026-07-27 10:22:08 |
| 133.88.88.0/22 | 5,456 | 2026-07-27 10:22:08 |
| 133.88.87.0/24 | 5,394 | 2026-07-27 10:22:08 |
| 133.88.92.0/23 | 5,383 | 2026-07-27 10:22:08 |
| 218.45.64.0/19 | 5,317 | 2026-07-27 10:22:08 |
| 120.50.192.0/20 | 5,299 | 2026-07-27 10:22:08 |
| 103.95.104.0/22 | 5,291 | 2026-07-27 10:22:08 |
| 219.100.156.0/22 | 5,288 | 2026-07-27 10:22:08 |
| 133.247.240.0/20 | 5,274 | 2026-07-27 10:22:08 |
| 133.247.136.0/21 | 5,273 | 2026-07-27 10:22:08 |
Frequently Asked Questions
What is AS131923?
AS131923 is an Autonomous System Number assigned to MCAT Ltd.. 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 AS131923 announce?
AS131923 announces 22.5K IPv4 addresses distributed across 10 routed CIDR prefixes. The network is registered in Japan.
Who operates AS131923?
AS131923 is operated by MCAT Ltd.. The organization is based in Japan. You can view all IP ranges and related ASNs on the organization page.
What country is AS131923 registered in?
AS131923 is registered in Japan. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
