AS59120
Tsukuba Internet Service 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 →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 202.222.10.0/23 | 512 |
49.2%
|
Tsukuba Internet Service Corporation | JP | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS59120 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 |
|---|---|---|
| 202.222.10.0/23 | 11,601 | 2026-08-02 10:18:45 |
Frequently Asked Questions
What is AS59120?
AS59120 is an Autonomous System Number assigned to Tsukuba Internet Service 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 AS59120 announce?
AS59120 announces 512 IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Japan.
Who operates AS59120?
AS59120 is operated by Tsukuba Internet Service Corporation. The organization is based in Japan. You can view all IP ranges and related ASNs on the organization page.
What country is AS59120 registered in?
AS59120 is registered in Japan. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
