Autonomous system
AS59120 TINS-NET - Tsukuba Internet Service Corporation
Unclassified APNIC
Summary
TINS-NET
isp residential japan small
TINS-NET is operated by Tsukuba Internet Service Corporation.
What it's used for
- The address space carries residential internet access, evidenced by the reverse DNS record
202-222-11-126.tsukuba3.v4.open.ad.jpwhich indicates dynamic IP assignment for end-user connections. - The AS announces a single IPv4 prefix,
202.222.10.0/23, comprising 512 addresses, and maintains only one observed routing neighbour, a configuration typical of a small local access provider rather than a transit carrier. - Traffic from this network consists of subscriber eyeballs connecting to the internet via the company's local infrastructure in the Tsukuba area.
Notable
- The registrant for the announced prefix is listed as
Japan Network Information Center; IRT-JPNIC-JP, which is the regional registry managing the address space, while the AS holder is Tsukuba Internet Service Corporation. - The address inventory is compact, consisting of a single contiguous /23 block with no announced IPv6 prefixes.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS18127 | Ibaraki Prefectural Government | 61 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-02, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 512 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 1 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS59120- Registry name
- TINS-NET
- Registered
- 2013-09-09
- Last changed
- 2016-03-24
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS59120
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 1 announcements
- Route objects
- 0 naming AS59120
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 1,851 prefixes, as published 2026-11-03. 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