Autonomous system
AS7623 HCNGYEONGBUK-AS-KR Gyeongbuk Cable TV
Residential APNIC
Summary
HCN Gyeongbuk (Gyeongbuk Cable TV)
isp legacy
HCNGYEONGBUK-AS-KR is the Gyeongbuk regional arm of HCN, a South Korean cable multi-system operator. Based in Pohang, it serves North Gyeongsang Province with cable television and broadband.
What it's used for
- Consumer cable broadband. The ASN announces roughly 84 prefixes, almost all /22s, scattered across
27.35.x,39.126.x,49.142-143.x,110.35.x,111.118.x,114.30.x,114.199.x,115.69.x,118.91.xand122.202.x— around 83,000 addresses in total. - That inventory shape is characteristic of a regional cable operator: many small, non-contiguous subscriber blocks acquired over time as the footprint grew, rather than one large clean allocation.
Notable
- This is eyeball address space. Traffic from it is residential cable-modem subscribers in and around Pohang, not hosting or corporate systems.
- Reverse DNS is essentially absent across the whole range, which is normal for Korean cable operators but means the registry records rather than the DNS are what identify it.
Interesting
- The holder has changed hands and names repeatedly while the ASN and its handle stayed put. It began as Hyundai HCN ("HY Communication & Network"), was bought by KT Skylife in 2021 for around 491 billion won, was rebranded simply HCN (re-glossed as "Hyper-Connected Network"), and became KT HCN in March 2025. The APNIC name still reads "Gyeongbuk Cable TV".
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 |
|---|---|---|
| AS7562 | HCN Dongjak | 5,208 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 33 prefixes · 83.46K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| KR | Korea, Republic of | 33 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS7623- Registry name
- HCNGYEONGBUK-AS-KR-KR
- Abuse contact
- hostmaster@nic.or.kr
- Registered
- 1997-09-11
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 84 with no ROA
- ROAs
- 0 authorising AS7623
- ASPA
- no ASPA record
- IRR
- 92% registered · 77 of 84 announcements
- Route objects
- 100 naming AS7623
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: 442 networks and 1,783 prefixes, as published 2026-10-17. 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