Autonomous system
AS24255 T-CATV - Koshinomiyako Network, Inc.
Residential APNIC
Summary
Koshinomiyako Network
cable isp residential japan
The AS handle T-CATV is held by Koshinomiyako Network, Inc.
What it's used for
- The address space carries residential cable and DSL traffic, evidenced by reverse DNS entries like
ttn64-33-47-254.ttn.ne.jpand netnames such asTTNandT-CATV-CIDR-BLK-JP. - The network announces 27,648 IPv4 addresses across 7 prefixes and 1 IPv6 prefix, while maintaining 21 observed neighbours; this ratio of address space to peering partners indicates an access or eyeball network rather than a transit provider.
Notable
- Registrants for all announced prefixes are listed as Japan Network Information Center with IRT-JPNIC-JP, which is consistent with the Japanese registry structure for this operator.
- The inventory consists of a mix of /18, /20, /21, and /22 blocks, including the large 64.33.0.0/18 range, suggesting a consolidated but varied address estate.
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 4 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.88.196 |
| JPIX Tokyo | Tokyo, Japan | 210.171.224.130 |
| BroadBand Internet eXchange Osaka | Osaka, Japan | 218.100.9.53 |
| JPIX Osaka | Osaka, Japan | 103.246.232.130 |
Transit providers
9 upstream, 0 downstream and 14 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-04, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 27.65K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 8 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS24255- Registry name
- T-CATV
- Abuse contact
- hostmaster@nic.ad.jp
- Registered
- 2004-10-19
- Last changed
- 2025-01-09
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 88% valid · 7 valid, 1 with no ROA
- ROAs
- 7 authorising AS24255
- ASPA
- no ASPA record
- IRR
- 25% registered · 2 of 8 announcements
- Route objects
- 2 naming AS24255
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 452 networks and 1,853 prefixes, as published 2026-11-05. 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