AS18183 National Center for Research on Earthquake Engineering

NCREE - National Center for Research on Earthquake Engineering · registered in Taiwan

IPv4 addresses5,6327 prefixes · <0.001% of announced IPv4

Rank in Taiwan#77largest network in TW by IPv4 space, of 237 · 0.02% of TW

Rank worldwide#12,750of 79,396 networks with IPv4

IPv62 x /32 (131,072 x /48)9 prefixes

CountryTaiwan288 ASNs registered there

Open AS18183 in ASN lookup Look up an IP in this network (61.56.0.1) All networks in Taiwan

IPv4 prefixes

All 7 prefixes, in address order.

61.56.0.0/22
61.56.4.0/24
61.56.5.0/24
61.56.6.0/23
61.56.8.0/21
103.189.132.0/23
202.5.12.0/22

IPv6 prefixes

All 9 prefixes.

2001:4500::/36
2001:4500:1000::/39
2001:4500:1200::/39
2001:4500:1400::/38
2001:4500:1800::/37
2001:4500:2000::/35
2001:4500:4000::/34
2001:4500:8000::/33
2400:85a0::/32

Similar-sized networks in Taiwan

ASNNameIPv4 addresses

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

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

AS18180#76 TWNIC-AS - Taiwan Network Information Center5,888

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

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

AS9678#80 HOSTINGINSIDE-INTL - HostingInside LTD4,864

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