asn.dev

Autonomous system

AS17529 MEDIACAT STARCAT CABLE NETWORK Co .,LTD.

Unclassified APNIC

IPv4 addresses 135K 12 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly JP
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Starcat

Japan · AI-generated

residential cable japan isp

MEDIACAT STARCAT CABLE NETWORK Co .,LTD. is the AS handle for Starcat, a Japanese cable television and internet service provider.

What it's used for

  • The address space carries residential user traffic, evidenced by reverse DNS entries such as h180-200-032-000.user.starcat.ne.jp and h058-146-016-000.user.starcat.ne.jp.
  • The AS announces 135424 IPv4 addresses across 12 prefixes and 1 IPv6 prefix, while maintaining only 2 observed neighbours, a ratio characteristic of an access network rather than a transit provider.

Notable

  • Registrants for the majority of prefixes are listed as Japan Network Information Center with netnames MEDIACAT-CIDR-BLK-JP or STARCAT, consistent with the announcer's identity.
  • The inventory includes a mix of large /17 and /18 blocks alongside smaller /19, /20, and /24 allocations, with one prefix carrying the netname SC-SCHOOL.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS9354Community Network Center Inc.745
AS2497Internet Initiative Japan Inc.59

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 12 prefixes · 135K addresses IPv6 1 prefixes

CountryNamePrefixes
JPJapan13

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS17529
Registry name
MediaCat
Abuse contact
hostmaster@nic.ad.jp
Registered
2000-12-12
Last changed
2025-12-12
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 14 valid, 0 with no ROA
ROAs
15 authorising AS17529
ASPA
no ASPA record
IRR
100% registered · 14 of 14 announcements
Route objects
31 naming AS17529

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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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

Cross-check