AS18180 Taiwan Network Information Center

TWNIC-AS - Taiwan Network Information Center · registered in Taiwan

IPv4 addresses5,88810 prefixes · <0.001% of announced IPv4

Rank in Taiwan#76largest network in TW by IPv4 space, of 237 · 0.02% of TW

Rank worldwide#12,666of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryTaiwan288 ASNs registered there

Open AS18180 in ASN lookup Look up an IP in this network (221.128.128.1) All networks in Taiwan

IPv4 prefixes

All 10 prefixes, in address order.

221.128.128.0/22
221.128.195.0/24
221.128.236.0/23
221.128.240.0/23
221.128.242.0/24
221.128.243.0/24
221.128.244.0/24
221.128.245.0/24
221.128.246.0/23
221.128.248.0/21

Other ASNs named Taiwan Network Information Center

3 other networks use the same organisation name; together with AS18180 they announce 8,704 IPv4 addresses.

ASNNameIPv4 addresses

AS131644TWNIC-AS - Taiwan Network Information Center TW2,304

AS131621TWNIC-NET-AS - Taiwan Network Information Center TW256

AS17718TWNIC - Taiwan Network Information center TW256

Similar-sized networks in Taiwan

ASNNameIPv4 addresses

AS7483#73 SKYCLOUD-NET - Skycloud Computing co., Ltd.6,912

AS131149#74 YUANJHEN-AS-TW - Yuan-Jhen Info., Co., Ltd6,656

AS17710#75 PIINET-TW - President Information Corp.6,144

AS18183#77 NCREE - National Center for Research on Earthquake Engineering5,632

AS131142#78 APOL-AS-TW - Asia Pacific On-Line Service Inc.5,120

AS63902#79 SHINETEL-AS-TW - SHINE TELECOM CO., LTD.5,120

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources