AS9505 — TWGATE-AP Taiwan Internet Gateway

AS9505 announces 14 IPv4 prefixes covering 22,272 addresses and 16 IPv6 prefixes.

About this network

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.net pattern (for example a hostname under chtivm.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.

Announced prefixes

• 66.171.112.0/23
• 66.171.116.0/23
• 175.41.48.0/20
• 175.111.224.0/20
• 175.111.240.0/21
• 203.78.176.0/20
• 203.160.224.0/20
• 208.70.200.0/24
• 208.70.202.0/23
• 208.70.206.0/23
• 220.128.48.0/23
• 220.128.50.0/24
• 220.128.52.0/23
• 220.128.54.0/24
• 2001:b200::/32
• 2606:c00::/42
• 2606:c00:33::/48
• 2606:c00:34::/48
• 2606:c00:36::/47
• 2606:c00:38::/45
• 2606:c00:40::/42
• 2606:c00:80::/41
• 2606:c00:100::/40
• 2606:c00:200::/39
• 2606:c00:400::/38
• 2606:c00:800::/37
• 2606:c00:1000::/36
• 2606:c00:2000::/35
• 2606:c00:4000::/34
• 2606:c00:8000::/33

Upstream networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS9002 RETN Limited
• AS38001 NewMedia Express Pte Ltd
• AS17639 Converge ICT Solutions Inc.
• AS24482 SG.GS
• AS48185 team.blue NV
• AS20485 Joint Stock Company TransTeleCom
• AS2497 Internet Initiative Japan Inc.
• AS57463 NetIX Communications JSC
• AS12552 GlobalConnect AB
• AS11164 Internet2
• AS4637 Telstra Global
• AS2914 NTT America, Inc.
• AS213241 TECHIT.BE SRL
• AS9680 HiNet Service Center in U.S.A

Downstream networks

• AS18182 Sony Network Taiwan Limited
• AS7532 Gamania CloudForce
• AS9924 Taiwan Fixed Network, Telco and Network Service Provider.
• AS55547 Unit D,E,F,G 28th Floor
• AS10126 Taiwan Internet Gateway
• AS9416 Hoshin Multimedia Center Inc.
• AS45250 Vocom International Telecommunications AP Area
• AS17408 AboveNet Communications Taiwan
• AS4780 Digital United Inc.
• AS7478 Mackay Telecommunication Inc.
• AS9264 Academia Sinica
• AS9304 HGC Global Communications Limited
• AS33717 Chunghwa Telecom Global, INC
• AS18047 National Tsing-Hua University
• AS131660 Data Communication Business Group,
• AS17716 National Taiwan University
• AS135140 Qun Ying Network Technology (Hong Kong) Co., Limited
• AS18183 National Center for Research on Earthquake Engineering
• AS58955 Bangmod Enterprise Co., Ltd.
• AS979 NetLab Global
• AS45430 SBN-IIG/AWN-IIG transit provider
• AS11414 Nvidia Corporation
• AS9902 NEOCOMISP LIMITED, IPTX Transit and Network Service Provider in Cambodia.
• AS132280 Symphony Communication (Thailand) PCL.
• AS138997 Eons Data Communications Limited

Adjacent networks

• AS1299 Arelion Sweden AB
• AS9924 Taiwan Fixed Network, Telco and Network Service Provider.
• AS174 Cogent Communications, LLC
• AS18182 Sony Network Taiwan Limited
• AS3356 Level 3 Parent, LLC
• AS7533 Savecom International Inc.
• AS7532 Gamania CloudForce
• AS6939 Hurricane Electric LLC
• AS38001 NewMedia Express Pte Ltd
• AS17408 AboveNet Communications Taiwan
• AS48185 team.blue NV
• AS45250 Vocom International Telecommunications AP Area
• AS9002 RETN Limited
• AS9416 Hoshin Multimedia Center Inc.
• AS55547 Unit D,E,F,G 28th Floor
• AS57463 NetIX Communications JSC
• AS4780 Digital United Inc.
• AS10126 Taiwan Internet Gateway
• AS12552 GlobalConnect AB
• AS9304 HGC Global Communications Limited
• AS17639 Converge ICT Solutions Inc.
• AS2497 Internet Initiative Japan Inc.
• AS20485 Joint Stock Company TransTeleCom
• AS4637 Telstra Global
• AS45430 SBN-IIG/AWN-IIG transit provider

Internet exchanges

• LINX LON1 — London, United Kingdom
• Equinix Internet Exchange Singapore — Singapore, Singapore
• BroadBand Internet eXchange Tokyo — Tokyo, Japan
• Coresite - Any2 West — Los Angeles, United States
• Any2 California — Los Angeles, United States
• Hong Kong Internet Exchange — Hong Kong, China
• JPIX Tokyo — Tokyo, Japan
• Equinix Internet Exchange Chicago — Chicago, United States
• Equinix Internet Exchange Hong Kong — Hong Kong, China
• Taipei Internet Exchange (TPIX) — Taipei, Taiwan
• Equinix Internet Exchange Los Angeles — Los Angeles, United States
• Bangkok Neutral Internet Exchange — Bangkok, Thailand
• Equinix Internet Exchange Palo Alto — Palo Alto, United States
• Equinix Los Angeles IBX — Los Angeles, United States