Data as of Nov 7, 2026
192.31.121.0/24
No anonymizer space · no proxy exits in 30 daysResearch Organization of Information and Systems, National Institute of Informatics · space held by Japan Network Information Center
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 192. | 2,304 | JAPAN-NETBLOCK-INET | Japan Network Information Center (ORG-JNIC1-AP) · JP | ALLOCATED PORTABLE | — | hostmaster@ |
| └ 192. | 1,536 | UTNET | University of Tokyo | ASSIGNED PORTABLE | — | hostmaster@ |
Network & registry
Registry
Holder
- Organization
- Japan Network Information Center
- Handle
- ORG-JNIC1-AP
- Range
- 192.
31. 116. 0 - 192. 31. 124. 255 - Registration type
- ALLOCATED PORTABLE
Origin network
AS2907
JP
- Name
- Research Organization of Information and Systems, National Institute of Informatics
- Type
- Education
- Registered
- Aug 1, 2002
- Domain
- sinet.ad.jp
- Website
- www.sinet.ad.jp/
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- Mar 2018
- Current origin since
- Mar 2018 · 8.6 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS2907 | JPIRR | University of Tokyo | MAINT-AS2907 | Dec 1, 2025 |
Whois
Registration for this announcement
- Range
- 192.
31. 121. 0/ 24 - Netname
- UTSNET-CIDR-BLK-JP
- Registrant
- University of Tokyo
- Registrant country
- JP
- Organization
- University of Tokyo
- Org country
- JP
- Created
- Not stated by the registry
- Updated
- Jun 13, 2018
- RIR
- APNIC
- Country
- JP
- Delegated
- Aug 21, 1992
- Status
- assigned