AS131932
JR East Information Systems Company
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
- Enterprise allocation +4
- Trust score 69 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 2 internet exchanges: JPIX TOKYO, BBIX Tokyo
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 157.72.0.0/14 | 262.1K |
0.1%
|
JR East Information Systems Company | JP | Tokyo | Kita |
| 157.71.0.0/16 | 65.5K |
0.4%
|
JR East Information Systems Company | JP | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS131932 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 |
|---|---|---|
| 157.72.0.0/17 | 5,952 | 2026-07-23 21:19:41 |
| 157.74.128.0/17 | 5,922 | 2026-07-23 21:19:41 |
| 157.74.0.0/17 | 5,918 | 2026-07-23 21:19:41 |
| 157.72.128.0/17 | 5,917 | 2026-07-23 21:19:41 |
| 157.73.128.0/17 | 5,915 | 2026-07-23 21:19:41 |
| 157.71.128.0/17 | 5,913 | 2026-07-23 21:19:41 |
| 157.75.128.0/17 | 5,905 | 2026-07-23 21:19:41 |
| 157.73.0.0/17 | 5,902 | 2026-07-23 21:19:41 |
| 157.75.0.0/17 | 5,890 | 2026-07-23 21:19:41 |
| 157.71.0.0/17 | 5,883 | 2026-07-23 21:19:41 |
| 157.73.192.0/18 | 5,196 | 2026-07-23 22:25:16 |
| 157.75.64.0/18 | 5,159 | 2026-07-23 22:25:16 |
| 157.72.48.0/21 | 5,150 | 2026-07-23 22:25:16 |
| 157.71.0.0/24 | 5,150 | 2026-07-23 22:25:16 |
| 157.72.176.0/21 | 5,147 | 2026-07-23 22:25:16 |
| 157.75.128.0/18 | 5,145 | 2026-07-23 22:25:16 |
| 157.71.20.0/24 | 5,143 | 2026-07-23 22:25:16 |
| 157.75.0.0/18 | 5,142 | 2026-07-23 22:25:16 |
| 157.75.192.0/18 | 5,142 | 2026-07-23 22:25:16 |
| 157.73.128.0/18 | 5,134 | 2026-07-23 22:25:16 |
| 157.73.64.0/18 | 5,127 | 2026-07-23 22:25:16 |
| 157.73.0.0/18 | 5,124 | 2026-07-23 22:25:16 |
| 157.74.128.0/18 | 5,120 | 2026-07-23 22:25:16 |
| 157.74.0.0/18 | 5,120 | 2026-07-23 22:25:16 |
| 157.72.168.0/22 | 5,118 | 2026-07-23 22:25:16 |
| 157.71.18.0/24 | 5,115 | 2026-07-23 22:25:16 |
| 157.74.192.0/18 | 5,115 | 2026-07-23 22:25:16 |
| 157.71.64.0/24 | 5,111 | 2026-07-23 22:25:16 |
| 157.72.40.0/22 | 5,100 | 2026-07-23 22:25:16 |
| 157.71.21.0/24 | 5,100 | 2026-07-23 22:25:16 |
| 157.72.148.0/24 | 5,098 | 2026-07-23 22:25:16 |
| 157.71.84.0/23 | 5,095 | 2026-07-23 22:25:16 |
| 157.71.80.0/22 | 4,931 | 2026-07-23 21:19:41 |
| 157.71.160.0/20 | 4,922 | 2026-07-23 21:19:41 |
| 157.72.224.0/19 | 4,919 | 2026-07-23 21:19:41 |
| 157.71.176.0/20 | 4,918 | 2026-07-23 21:19:41 |
| 157.72.0.0/19 | 4,917 | 2026-07-23 21:19:41 |
| 157.72.184.0/21 | 4,913 | 2026-07-23 21:19:41 |
| 157.72.56.0/21 | 4,912 | 2026-07-23 21:19:41 |
| 157.71.112.0/20 | 4,908 | 2026-07-23 21:19:41 |
| 157.71.128.0/20 | 4,908 | 2026-07-23 21:19:41 |
| 157.72.150.0/23 | 4,908 | 2026-07-23 21:19:41 |
| 157.72.160.0/21 | 4,907 | 2026-07-23 21:19:41 |
| 157.72.192.0/19 | 4,907 | 2026-07-23 21:19:41 |
| 157.71.19.0/24 | 4,906 | 2026-07-23 21:19:41 |
| 157.72.149.0/24 | 4,906 | 2026-07-23 21:19:41 |
| 157.72.152.0/21 | 4,903 | 2026-07-23 21:19:41 |
| 157.72.44.0/22 | 4,901 | 2026-07-23 21:19:41 |
| 157.72.172.0/22 | 4,899 | 2026-07-23 21:19:41 |
| 157.71.96.0/20 | 4,899 | 2026-07-23 21:19:41 |
Showing top 50 of 71 announced prefixes by sample volume.
Frequently Asked Questions
What is AS131932?
AS131932 is an Autonomous System Number assigned to JR East Information Systems Company. 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 AS131932 announce?
AS131932 announces 327.7K IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in Japan.
Who operates AS131932?
AS131932 is operated by JR East Information Systems Company. The organization is based in Japan. You can view all IP ranges and related ASNs on the organization page.
What country is AS131932 registered in?
AS131932 is registered in Japan. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
