AS23675 — TSMCGDN-AS-AP Taiwan Semiconductor Manufactoring Company, Ltd.

AS23675 announces 8 IPv4 prefixes covering 4,864 addresses and 0 IPv6 prefixes.

About this network

The AS handle TSMCGDN-AS-AP is held by Taiwan Semiconductor Manufacturing Company, Ltd.

What it's used for

• The address space carries corporate infrastructure for TSMC, evidenced by netnames such as TSMCGDN, TAIWAN-SEMICONDU-HC-TW, and TSMC-North-America-TW.
• The AS announces 4864 IPv4 addresses across 8 prefixes with only 2 observed neighbours, a ratio that indicates an internal corporate estate rather than a transit or access network.

Notable

• Registrants for the largest prefixes (202.126.64.0/21 and 202.126.72.0/22) align with the announcer, listing IRT-TSMC-TW and Taiwan Semiconductor Manufacturing Company, Ltd.
• The inventory includes prefixes registered to third parties, including HINET-NET (HiNet), NCICNET-NET, and CHT-GLOBAL (Chunghwa Telecom Global), suggesting leased or historically allocated space.
• The reverse DNS sample for the 106.105.110.0/24 block shows dynamic ADSL hostnames (adsl.dynamic.seed.net.tw), which contrasts with the corporate nature of the other prefixes.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 106.105.110.0/24
• 202.126.64.0/21
• 202.126.72.0/22
• 203.66.100.0/23
• 203.66.102.0/24
• 203.66.245.0/24
• 208.70.204.0/24
• 220.128.55.0/24

Upstream networks

• AS13335 Cloudflare, Inc.
• AS4780 Digital United Inc.

Adjacent networks

• AS13335 Cloudflare, Inc.
• AS4780 Digital United Inc.

Routing security

• RPKI: 19 valid, 0 invalid and 0 not-found announcements; 9 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 38 route objects.
• Listed in as-sets: AS-BTC-UP, AS-KDDCUSTOMER2, AS-SEEDNET, AS-TELSTRA-INTL-CUSTOMERS, AS13335:AS-CUSTOMERS.