Autonomous system
AS23641 NSCS-NET NS Computer Service Corporation
Unclassified RIPE NSP
Summary
NS Computer Service Corporation
isp residential japan nsp
NSCS-NET is the AS handle for NS Computer Service Corporation, a Japanese network service provider.
What it's used for
- The address space carries residential user traffic, evidenced by reverse DNS entries like
usr254.g027.nabic.jpandusr254.g229.nabic.jp. - The AS announces 6144 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, while maintaining 10 observed neighbours; this ratio of address space to peering partners indicates an access or eyeball network role.
Notable
- The registrants for both announced IPv4 prefixes are listed as Japan Network Information Center (JPNIC) with the netname
NSCS-NET-CIDR-BLK-JP, which is consistent with the AS holder's identity. - The address inventory consists of two distinct IPv4 blocks,
211.19.16.0/20and203.86.224.0/21, alongside a single IPv6 prefix2403:9200::/32.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.88.143 |
| Echigo Internet Exchange | Niigata, Japan | 58.84.254.19 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-30, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 6.14K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 3 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS23641- Registry name
- NSCS-NET
- Abuse contact
- hostmaster@nic.ad.jp
- Registered
- 2003-01-31
- Last changed
- 2007-10-15
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- N.S Computer Service
- Also known as
- naBic net
- Network type
- NSP
- Scope
- Regional
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
AS-NSCS-NET- Present at
- 2 exchanges
- Website
- http://nscs.jp/
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 3 authorising AS23641
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 3 naming AS23641
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 448 networks and 1,849 prefixes, as published 2026-10-30. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere