AS10164 — SKB-GSD-AS-KR SK Broadband Co Ltd

AS10164 announces 10 IPv4 prefixes covering 69,632 addresses and 0 IPv6 prefixes.

About this network

SKB-GSD-AS-KR is a secondary autonomous system of SK Broadband, the Seoul-headquartered fixed-line operator that is a wholly owned subsidiary of SK Telecom and one of South Korea's largest broadband providers. Its main network is AS9318; this number carries a divisional slice of the same estate.

What it's used for

• Holding and announcing a block of SK Broadband access space. The size and shape of the prefixes point at subscriber-facing use rather than servers.

Notable

The pack shows an unusual combination: 69,632 announced IPv4 addresses across only 10 prefixes — a very high address-to-prefix ratio, built from /18 and /19 aggregates such as 27.117.128.0/18, 110.35.96.0/19 and 180.150.192.0/19 — but just one observed BGP neighbour and no IPv6.

Read those together and the role is clear. Large contiguous aggregates announced with a single adjacency is what an operator's internal AS looks like: it exists as an addressing and policy container behind the parent network, and the outside world only ever reaches it through SK Broadband proper. It is not a carrier (one neighbour), not an enterprise (no enterprise holds 69k addresses in /18s), and not a hosting network (hosting space is carved fine, not aggregated coarse).

Confidence is held low on the use rather than the operator. SK Broadband is unambiguously an eyeball ISP and these are eyeball-shaped aggregates, but the pack returned no reverse DNS on the addresses sampled, so nothing here independently proves subscriber assignment over corporate access lines.

Interesting

• The mix includes recent APNIC blocks (45.112.88.0/22, 103.51.168.0/22) alongside older space, showing the AS still absorbs new allocations.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 27.117.128.0/18
• 45.112.88.0/22
• 103.51.168.0/22
• 110.35.96.0/19
• 116.199.160.0/21
• 118.91.96.0/19
• 119.82.32.0/19
• 180.150.192.0/19
• 203.210.32.0/19
• 210.2.32.0/19

Upstream networks

• AS9318 SK Broadband Co Ltd

Adjacent networks

• AS9318 SK Broadband Co Ltd

Routing security

• RPKI: 0 valid, 0 invalid and 10 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 231 route objects.
• Listed in as-sets: AS-ANC-CUSTOMER-PROXY-REGISTER, AS-DACOM, AS-HANARO, AS-HURRICANE, AS-KINX-TRANSIT, AS-KORNETBGP, AS-PACNET-CUSTOMER-PROXY-REGISTER, AS-SEJONG, AS-SHINBIRO, AS-SKBROADBAND, AS-TBROAD, AS-XO-B, AS3491:AS-CUSTOMERS-AP, AS3491:AS-CUSTOMERS-TEST.