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 3 internet exchanges: JPNAP Tokyo: Peering, BBIX Tokyo, BBIX Osaka
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 126.251.0.0/19 | 8.2K |
94.6%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 126.251.128.0/19 | 8.2K |
91.5%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 170.249.96.0/19 | 8.2K |
90.5%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 126.251.128.0/20 | 4.1K |
91.8%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 126.251.32.0/21 | 2.0K |
93.7%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 126.251.112.0/21 | 2.0K |
90.5%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 170.249.64.0/21 | 2.0K |
88.3%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 103.118.92.0/22 | 1.0K |
94.1%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 202.223.12.0/22 | 1.0K |
98.2%
|
Joetsu Cable Vision | JP | Niigata | Jōetsu |
| 103.152.66.0/23 | 512 |
93.9%
|
Joetsu Cable Vision | JP | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS131937 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 |
|---|---|---|
| 126.251.112.0/21 | 6,524 | 2026-07-28 23:24:25 |
| 126.251.128.0/20 | 6,506 | 2026-07-28 23:24:25 |
| 126.251.32.0/21 | 6,503 | 2026-07-28 23:24:37 |
| 126.251.0.0/19 | 6,489 | 2026-07-28 23:24:25 |
| 170.249.64.0/21 | 6,390 | 2026-07-28 23:24:25 |
| 103.118.92.0/22 | 6,384 | 2026-07-28 23:24:25 |
| 202.223.12.0/22 | 6,382 | 2026-07-28 23:24:25 |
| 170.249.96.0/19 | 6,359 | 2026-07-28 23:24:25 |
| 103.152.66.0/23 | 6,281 | 2026-07-28 23:24:34 |
| 126.251.144.0/20 | 4,288 | 2026-07-28 23:24:25 |
Frequently Asked Questions
What is AS131937?
AS131937 is an Autonomous System Number assigned to Joetsu Cable Vision. 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 AS131937 announce?
AS131937 announces 33.3K IPv4 addresses distributed across 10 routed CIDR prefixes. The network is registered in Japan.
Who operates AS131937?
AS131937 is operated by Joetsu Cable Vision. The organization is based in Japan. You can view all IP ranges and related ASNs on the organization page.
What country is AS131937 registered in?
AS131937 is registered in Japan. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
