Autonomous system
AS9505 TWGATE-AP Taiwan Internet Gateway
Unclassified APNIC
Summary
Chunghwa Telecom International (TWGate)
isp transit legacy
AS9505 (TWGATE-AP, "Taiwan Internet Gateway") is held by Chunghwa Telecom Co., Ltd., registered to its International Business Group in Taipei. TWGate is Chunghwa's international gateway brand: the AS that carries Taiwan's largest telco's traffic out to the rest of the world, distinct from the domestic HiNet consumer network.
What it's used for
The routing evidence is unambiguous about the role. AS9505 announces only 34 IPv4 prefixes covering roughly 24,576 addresses, plus 10 IPv6 prefixes out of 2001:b200::/32 — a small footprint by carrier standards. But it is observed with around 161 BGP neighbours. That ratio is the classic signature of a wholesale and transit network rather than an access network: an eyeball ISP holding tens of thousands of addresses would peer with a handful of upstreams, not with well over a hundred peers. The addresses here are largely infrastructure and customer-facing gateway space, not a subscriber pool.
Sampled reverse DNS backs this up. Most addresses resolve under twgate-ip.twgate.net in a generated A-B-C-D form, the naming a carrier uses for its own gateway and transit ranges. Notably, the announced space is not purely APNIC: 208.70.200.0/21 and 66.171.112.0/21 are North American blocks, consistent with Chunghwa's overseas points of presence serving trans-Pacific customers from the same AS.
Notable
- Chunghwa Telecom runs several distinct ASes; TWGate is the international/transit face, not the domestic broadband one.
- A few sampled PTRs fall outside the
twgate.netpattern (for example a hostname underchtivm.com.tw), consistent with customer and hosted services riding the gateway's address space.
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 14 exchanges in 7 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.225.37 |
| Equinix Internet Exchange Singapore | Singapore, Singapore | 27.111.228.63 |
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.90.124 |
| Coresite - Any2 West | Los Angeles, United States | 206.72.210.108 |
| Any2 California | Los Angeles, United States | 206.72.210.108 |
| Hong Kong Internet Exchange | Hong Kong, China | 123.255.91.131 |
| JPIX Tokyo | Tokyo, Japan | 210.171.224.89 |
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.51 |
Transit providers
18 upstream, 38 downstream and 107 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 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 25 prefixes · 22.27K addresses IPv6 31 prefixes
| Country | Name | Prefixes |
|---|---|---|
| TW | Taiwan, Province of China | 56 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9505- Registry name
- TWGATE-AP
- Registrant
- Chunghwa Telecom Co., Ltd.
- Abuse contact
- b-noc@cht.com.tw
- Registered
- 2008-09-04
- Last changed
- 2020-06-10
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 45 valid, 0 with no ROA
- ROAs
- 15 authorising AS9505
- ASPA
- no ASPA record
- IRR
- 100% registered · 45 of 45 announcements
- Route objects
- 39 naming AS9505
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