AS9756 SKB-CHEONANVITSSEN-AS-KR SK Broadband Co Ltd

AS9756 (SKB-CHEONANVITSSEN-AS-KR) is held by SK Broadband Co., Ltd., the fixed-line broadband and pay-TV arm of the SK Group and one of South Korea's three large access providers. The handle preserves the name of a regional operator in the Cheonan area of South Chungcheong, and this AS carries that regional slice of SK Broadband's footprint rather than the company's main national network.

What it's used for

The routing evidence is a textbook access network. RIS shows roughly 108,544 IPv4 addresses across about 42 prefixes, anchored on large aggregates — a /17 at 211.247.0.0 plus /18s at 121.127.64.0, 210.210.192.0, 121.127.128.0 and 27.117.192.0 — with a long tail of /23s and /24s carved out of them. Against that six-figure address count sits just one observed BGP neighbour. A wholesale or transit carrier of this size would peer with hundreds of ASes; a single upstream and a big pool of contiguous space is the shape of a network that serves its own subscribers and buys transit from its parent. No IPv6 is announced from this ASN.

Notable

• SK Broadband is a subsidiary of SK Telecom and grew by consolidating regional operators, including its 2020 merger with cable MSO t-broad. Legacy per-region ASNs and handles like this one are a residue of that consolidation.
• The address space is entirely IPv4 despite Korea's generally strong IPv6 deployment, which is common for these absorbed regional networks.