Autonomous system
AS18092 CSF Kyushu Tele Communications Company
Unclassified APNIC
Summary
CSF
cable isp residential kyushu
The AS handle CSF is operated by CSF - Kyushu Tele Communications Company.
What it's used for
- The address space carries residential cable and DSL access, evidenced by reverse DNS names such as
dhcp-ubr3-5509.csf.ne.jpandcableline-13048.tvs12.jp. - The AS announces 45056 IPv4 addresses across 26 prefixes and 1 IPv6 prefix, with only 7 observed neighbours, indicating a regional access network rather than a transit provider.
Notable
- Registrants for the largest prefixes are listed as Japan Network Information Center, with netnames including
CSF-NET-CIDR-BLK-JP,CABLELINE, andCSF-NET. - The address inventory is finely subdivided into /20, /21, /22, /23, and /24 blocks, consistent with a corporate estate segmented by site or service type.
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
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Osaka | Osaka, Japan | 218.100.9.157 |
| JPIX Osaka | Osaka, Japan | 103.246.232.178 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 26 prefixes · 45.06K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 27 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS18092- Registry name
- CSF
- Abuse contact
- hostmaster@nic.ad.jp
- Registered
- 2001-12-27
- Last changed
- 2005-07-14
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 51 with no ROA
- ROAs
- 0 authorising AS18092
- ASPA
- no ASPA record
- IRR
- 100% registered · 51 of 51 announcements
- Route objects
- 148 naming AS18092
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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