Data as of Nov 6, 2026

192.153.101.0/24

No anonymizer space · no proxy exits in 30 days

Research Organization of Information and Systems, National Institute of Informatics · space held by imported inetnum object for NCSIS-1

Announcement

RPKI valid

Announced by

Type

Business

Risk

0 / 100 · Low

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
192.153.95.0 - 192.153.104.255	2,560	NETBLK-SINET-C1	imported inetnum object for NCSIS-1	ASSIGNED PORTABLE	—	hostmaster@nic.ad.jp
└ 192.153.101.0/24	256	SINET	Research Organization of Information and Systems, National Institute of Informatics	ASSIGNED PORTABLE	—	hostmaster@nic.ad.jp

Announced by

Prefix: 192.153.96.0/21
Announced by: AS2907 Research Organization of Information and Systems, National Institute of Informatics
Type: Business
RPKI: RPKI valid
Netname: NETBLK-SINET-C1
Registrant: imported inetnum object for NCSIS-1
RIR: APNIC

Origin network

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

RPKI

ROA prefix	ASN	Max len	Anchor	Verdict
192.153.96.0/21	AS2907	/32	APNIC	RPKI valid

IRR

Origin	Registry	Description	Maintainer	Modified
AS2907	JPIRR	National Institute of Informatics	MAINT-AS2907	Mar 2, 2026