Autonomous system
AS9781 GCS-AS-KR GREEN CABLE TELEVISION STATION
Residential APNIC
Summary
Green Cable Television Station (GCS)
isp residential legacy
AS9781 (GCS-AS-KR) is held by Green Cable Television Station, a cable television and broadband system operator based in Dalseo-gu, Daegu, in south-eastern South Korea. Despite the broadcast-sounding name, the AS is a working access ISP: Korean cable SOs have delivered internet over their HFC plant for decades, and the routing evidence matches that role.
What it's used for
Residential and small-business broadband in the operator's franchise area. RIS sees 65 IPv4 prefixes carrying 106,496 addresses against only 4 observed BGP neighbours. That ratio is the tell. A hundred thousand addresses is a substantial pool, but a wholesale carrier holding that much space would peer with hundreds of networks; four adjacencies means the traffic is going one way, out to a small number of national upstreams, and the addresses are being consumed by the operator's own subscribers. Publicly reported upstreams are the major Korean carriers, which is exactly the shape of a regional cable ISP buying transit rather than selling it.
Notable
- The address space is deeply fragmented for a network of this size: 65 announcements built from a couple of /18s in
121.55.0.0and114.199.0.0, a stack of /19s and /20s, and many smaller pieces, several of them more-specifics of each other. - No IPv6 is announced, which leaves subscribers on IPv4 only.
- The operator is a regional player tied to Daegu, not one of the nationwide Korean broadband brands.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 51 prefixes · 106K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 51 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9781- Registry name
- GCS-AS-KR-KR
- Abuse contact
- hostmaster@nic.or.kr
- Registered
- 1999-12-10
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 65 with no ROA
- ROAs
- 0 authorising AS9781
- ASPA
- no ASPA record
- IRR
- 100% registered · 65 of 65 announcements
- Route objects
- 66 naming AS9781
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: 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