Autonomous system
AS9756 SKB-CHEONANVITSSEN-AS-KR SK Broadband Co Ltd
Residential APNIC
Summary
SK Broadband (Cheonan regional network)
isp residential legacy
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.
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.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS9318 | SK Broadband Co Ltd | 1,220 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 44 prefixes · 109K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 44 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9756- Registry name
- SKB-CHEONANVITSSEN-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, 20 with no ROA
- ROAs
- 0 authorising AS9756
- ASPA
- no ASPA record
- IRR
- 100% registered · 20 of 20 announcements
- Route objects
- 363 naming AS9756
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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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