AS17944 Japan Weather Association

JWA - Japan Weather Association · registered in Japan

IPv4 addresses65,7929 prefixes · 0.002% of announced IPv4

Rank in Japan#113largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#2,787of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryJapan745 ASNs registered there

Open AS17944 in ASN lookup Look up an IP in this network (133.105.0.1) All networks in Japan

IPv4 prefixes

All 9 prefixes, in address order.

133.105.0.0/17
133.105.128.0/19
133.105.160.0/23
133.105.162.0/23
133.105.164.0/22
133.105.168.0/21
133.105.176.0/20
133.105.192.0/18
192.51.39.0/24

IPv6 prefixes

All 1 prefix.

2001:df0:2ca::/48

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS150359#110 CTTNET - Cable Television TOYAMA Inc.66,048

AS131158#111 NAIST-AS - Nara Institute of Science and Technology, National University Corporation66,048

AS17932#112 JAIST - Japan Advanced Institute of Science and Technology65,792

AS9367#114 ISCT - Institute of Science Tokyo65,536

AS131161#115 NECCN - NEC Corporation65,536

AS2500#116 WIDE-BB - WIDE Project65,536

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