AS18180 — TWNIC-AS Taiwan Network Information Center

AS18180 announces 4 IPv4 prefixes covering 5,888 addresses and 0 IPv6 prefixes.

About this network

TWNIC-AS is the autonomous system for Taiwan Network Information Center.

What it's used for

• The address space carries infrastructure for the national registry, with reverse DNS entries pointing to unknown.itsidc.com and netnames set to CYNET.
• The AS announces 4608 IPv4 addresses across 9 prefixes and maintains 4 observed neighbours, a ratio consistent with a specialized infrastructure or registry network rather than a large access provider.

Notable

• All registrants for the announced prefixes are listed as IRT-CNNIC-CN, which differs from the TWNIC announcer, suggesting the space may be leased or managed under a different registry authority.
• The inventory consists of a single contiguous block within the 221.128.0.0/16 range, subdivided into nine smaller prefixes.

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

Announced prefixes

• 221.128.128.0/22
• 221.128.195.0/24
• 221.128.236.0/23
• 221.128.240.0/20

Upstream networks

• AS136826 PT TITIK TERANG MAKMUR
• AS55933 Cloudie Limited
• AS134196 ANYUN INTERNET TECHNOLOGY (HK) CO.,LIMITED

Adjacent networks

• AS136826 PT TITIK TERANG MAKMUR
• AS55933 Cloudie Limited
• AS134196 ANYUN INTERNET TECHNOLOGY (HK) CO.,LIMITED

Routing security

• RPKI: 0 valid, 0 invalid and 17 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 18% of announcements registered; 5 route objects.
• Listed in as-sets: AS-BTN-CUSTOMERS, AS-CHIEF-TRANSIT, AS-CLOUDIE-HK, AS-RAINBOW-JP, AS-SEEDNET, AS-SPARQ, AS-TELSTRA-INTL-CUSTOMERS, AS-TPIX, AS134196:AS-COND, AS58453:AS-ASIAASCUST, AS58453:AS-ASIAASCUST, AS7473:AS-CUSTOMERS:AS17408.