Autonomous system
AS9351 ZLAN ZTV CO.,LTD
Residential APNIC
Summary
ZTV (Z-LAN)
isp residential legacy
AS9351 (ZLAN) is held by ZTV Co., Ltd., a cable television operator headquartered in Tsu, Mie Prefecture, serving Mie and neighbouring Shiga and Wakayama. The handle is its Internet brand, "Z-LAN"; alongside cable TV it sells broadband and telephony.
What it's used for
This is a cable eyeball network and the evidence is about as clean as it gets. RIS observes 30 IPv4 prefixes carrying roughly 249,856 addresses, one IPv6 /32 (2401:900::/32), and 25 BGP neighbours. A quarter of a million addresses in only 30 aggregates — /17s and /18s at the top, /19s and /20s below — is the shape of an access network pooling subscribers into large contiguous blocks, and the low neighbour count rules out any wholesale role. Reverse DNS confirms it directly: essentially every sampled address resolves to a host-<a>-<b>-<c>-<d> pattern under ztv.ne.jp or pc.ztv.ne.jp, the generic per-subscriber naming that cable operators apply across their entire consumer pool. A second brand, amigo.ne.jp / amigo2.ne.jp, appears on parts of the space, so the AS carries more than one consumer ISP name.
Notable
- ZTV runs cable TV, Internet and fixed telephony as a regional Japanese MSO; this AS is the Internet side of that business.
- Consumer-CPE reverse DNS across almost the whole sample makes the residential classification unusually well grounded here.
- IPv6 is announced as a single
/32with no deaggregation.
Interesting
Two of the announced prefixes, 193.116.0.0/19 and 193.117.64.0/19, sit in 193/8 — historically European address space — yet their PTRs resolve to host-193-117-64-5.pc.ztv.ne.jp. Whatever the blocks' origin, they are genuinely in service carrying Japanese cable subscribers today.
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 5 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.89.38 |
| JPIX Tokyo | Tokyo, Japan | 210.171.224.77 |
| BroadBand Internet eXchange Osaka | Osaka, Japan | 218.100.9.173 |
| Equinix Internet Exchange Tokyo | Tokyo, Japan | 203.190.230.84 |
| JPIX Osaka | Osaka, Japan | 103.246.232.225 |
Transit providers
10 upstream, 4 downstream and 17 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 30 prefixes · 250K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 31 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9351- Registry name
- ZLAN
- Registered
- 1998-08-17
- Last changed
- 2005-02-23
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 97% valid · 30 valid, 1 with no ROA
- ROAs
- 30 authorising AS9351
- ASPA
- no ASPA record
- IRR
- 71% registered · 22 of 31 announcements
- Route objects
- 34 naming AS9351
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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