Autonomous System
AS23780 CTB Media Inc.
ISPActiveJapanAPNIC
AS23780 (CTB) is an ISP network operated by CTB Media Inc. in Japan, registered with APNIC. It has 5 IPv4 prefixes with 16,384 addresses and 1 IPv6 prefix, which makes it the 7,777th largest of 82,283 active autonomous systems by IPv4 space.
IPv4 addresses16,384in 5 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#7,777of 82,283 active ASNs
Details
OrganizationCTB Media Inc.
AS nameCTB
Websitectb.ne.jp
Country Japan (JP)
Network typeISP
RegistryAPNIC
Abuse contacthostmaster@nic.ad.jp
Registered—
Last updated2024-08-16
IPv4 prefixes
5 prefixes · 16,384 addresses| Network | Addresses | First – last address |
|---|---|---|
| 211.19.224.0/19 | 8,192 | 211.19.224.0 – 211.19.255.255 |
| 211.15.112.0/20 | 4,096 | 211.15.112.0 – 211.15.127.255 |
| 49.128.24.0/21 | 2,048 | 49.128.24.0 – 49.128.31.255 |
| 49.128.96.0/22 | 1,024 | 49.128.96.0 – 49.128.99.255 |
| 203.201.52.0/22 | 1,024 | 203.201.52.0 – 203.201.55.255 |
211.19.224.0/19 211.15.112.0/20 49.128.24.0/21 49.128.96.0/22 203.201.52.0/22
IPv6 prefixes
1 prefix- 2402:6c80::/32
2402:6c80::/32
Query AS23780 with the API
The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day.
curl "https://api.ipapi.is/?q=AS23780&key=YOUR_API_KEY"Any address in its prefixes resolves to AS23780, with or without a key:
curl "https://api.ipapi.is/?q=211.19.224.1"Largest networks in Japan
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