AS2500 WIDE Project

WIDE-BB - WIDE Project · registered in Japan

IPv4 addresses65,5363 prefixes · 0.002% of announced IPv4

Rank in Japan#116largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#2,912of 79,396 networks with IPv4

IPv648,384 x /4811 prefixes

CountryJapan745 ASNs registered there

Open AS2500 in ASN lookup Look up an IP in this network (133.4.128.1) All networks in Japan

IPv4 prefixes

All 3 prefixes, in address order.

133.4.128.0/18
202.249.0.0/18
203.178.128.0/17

IPv6 prefixes

All 11 prefixes.

2001:200::/38
2001:200:400::/39
2001:200:700::/40
2001:200:800::/40
2001:200:a00::/39
2001:200:c00::/39
2001:200:f00::/40
2001:200:1000::/36
2001:200:2000::/35
2001:200:4000::/34
2001:200:8000::/34

Other ASNs named WIDE Project

4 other networks use the same organisation name; together with AS2500 they announce 67,072 IPv4 addresses.

ASNNameIPv4 addresses

AS7500M-ROOT-DNS - WIDE Project JP1,024

AS23634E-DNS-JP - WIDE Project JP256

AS4690WIDE-SFO - WIDE Project JP256

AS4717AI3 - WIDE Project JPIPv6 only

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS17944#113 JWA - Japan Weather Association65,792

AS9367#114 ISCT - Institute of Science Tokyo65,536

AS131161#115 NECCN - NEC Corporation65,536

AS9991#117 SHUDO-U - Hiroshima Shudo University65,536

AS10014#118 NIHON-U - Nihon University65,536

AS17523#119 AOYAMA - Aoyama Gakuin University65,536

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