AS9946 CABLENET-AS-KR KCTV JEJU BROADCASTING

AS9946 (CABLENET-AS-KR) is held by KCTV Jeju Broadcasting (KCTV 제주방송), the cable television and broadband operator for Jeju Island. It is the island's local system operator, running cable TV and cable internet under the kctvjeju.com domain.

What it's used for

This is a regional residential access network. RIS sees 131 IPv4 prefixes carrying 116,736 addresses and no IPv6. One large aggregate, 27.100.128.0/17, holds about half the total; the rest is a long tail of /22s spread across 112.133.x, 122.202.x and 144.48.x — allocations picked up separately over the years rather than as one contiguous block, which is the usual pattern for a Korean cable SO that grew its subscriber base incrementally.

Two observed neighbours is the decisive signal. Over a hundred thousand addresses reached through only two BGP adjacencies means this network exists to serve its own customers, not to carry anyone else's traffic. A wholesale or transit operator with this much address space would show dozens of peers; two says KCTV Jeju buys upstream connectivity from mainland Korean carriers and terminates it in Jeju households and businesses.

Notable

• Jeju is a self-contained island market, and KCTV is its incumbent cable operator — a rare case where an AS maps almost exactly onto a single geographic region.
• Broadcast-first companies becoming significant broadband ISPs is a distinctly South Korean pattern; KCTV Jeju sits alongside operators such as [AS9943](https://asn.ipinfo.app/AS9943) (KangNam Cable TV) as a regional cable SO holding its own ASN and a six-figure address block.
• No IPv6 announced, which is a common gap among Korea's regional cable operators even as the national carriers have deployed it.