Autonomous system
AS10054 CMBKJ-AS-KR CMB Kwangju Broadcasting
Residential APNIC
Summary
CMB Kwangju Broadcasting
CMBKJ-AS-KR is CMB Kwangju Broadcasting, the CMB group's cable system operator for Gwangju and the surrounding towns of South Jeolla. AS10054 is the access network behind its consumer broadband product.
What it's used for
Household internet delivered over a hybrid fibre-coaxial cable plant, sold alongside digital cable TV and bundled phone service. The franchise covers Gwangju Metropolitan City plus Naju, Hwasun, Boseong, Damyang, Hampyeong, Gurye, Gokseong, Jangseong and Yeonggwang. The AS announces 89 IPv4 prefixes totalling 76,800 addresses and no IPv6, and the composition is the tell: dozens of near-identical /22s drawn from 49.246.0.0, 112.121.0.0, 112.133.0.0 and 120.29.0.0. Uniform /22s repeated at that scale are how a cable operator carves subscriber pools per headend and per node, not how an enterprise or a hosting provider lays out address space.
Notable
This is an eyeball network, and the neighbour count is what settles it rather than the name. Roughly 76,800 addresses with only two observed BGP neighbours describes a regional access ISP that buys transit from a national carrier and sells none: a wholesale operator holding comparable space would show hundreds of adjacencies. A broadcaster's content business would not need 300 /24s' worth of addresses at all — the address count only makes sense if there are subscribers on the other end.
Interesting
The IPv4-only posture is notable in a country with otherwise strong IPv6 deployment, and reflects the long tail of Korean cable MSOs still running older HFC plant. Do not confuse this AS with Kwangju Broadcasting Corporation (KBC), the unrelated regional TV broadcaster.
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 19 prefixes · 76.80K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 19 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS10054- Registry name
- CMBKJ-AS-KR-KR
- Abuse contact
- hostmaster@nic.or.kr
- Registered
- 2000-06-16
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 89 with no ROA
- ROAs
- 0 authorising AS10054
- ASPA
- no ASPA record
- IRR
- 100% registered · 89 of 89 announcements
- Route objects
- 153 naming AS10054
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: 436 networks and 1,771 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