Data as of Nov 8, 2026
133.247.140.0/24
No anonymizer space · no proxy exits in 30 daysMCAT Ltd. · space held by Japan Network Information Center
Registrations in this block
The registry's network records over this block, widest first, each under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 133.0.0.0/8 | 16,777,216 | JPNIC-NET-JP-ERX | Japan Network Information Center | ALLOCATED PORTABLE | — | hostmaster@ |
Network & registry
Announced by
Covering announcement 133.247.136.0/21
- Prefix
- 133.247.136.0/21
- Announced by
- AS131923 MCAT Ltd.
- Type
- Residential
- Proxy exits
- 21
- Always-on exits
- 2
- RPKI
- RPKI valid
- Netname
- MCAT
- Registrant
- MCAT Ltd.
- RIR
- APNIC
IPv4 market
Holder
- Organization
- Japan Network Information Center
- Range
- 133.
0. 0. 0/ 8 - Registration type
- ALLOCATED PORTABLE
Origin network
AS131923
JP
- Name
- MCAT Ltd.
- Type
- Internet provider
- Registered
- Aug 4, 2011
- Domain
- mcat.co.jp
- Website
- www.mcat.co.jp/
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced 133.247.136.0/21
133.247.136.0/21
Routing history
- Pattern
- Stable
- First seen
- Nov 2020
- Current origin since
- Nov 2020 · 6.0 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 133.247.136.0/21 | AS131923 | /25 | APNIC | RPKI valid |
IRR
Route objects on 133.247.136.0/21
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS131923 | JPIRR | MCAT Ltd. CIDR-block NO.77 | MAINT-AS131923 | Mar 1, 2026 |
Whois
Registration for this announcement
- Range
- 133.
247. 136. 0/ 21 - Netname
- MCAT
- Registrant
- MCAT Ltd.
- Registrant country
- JP
- Organization
- MCAT Ltd.
- Org country
- JP
- Created
- Not stated by the registry
- Updated
- Sep 20, 2024
- RIR
- APNIC
- Country
- JP
- Delegated
- Mar 1, 1997
- Status
- assigned