AS18149 Japan Registry Service Co., Ltd.

JPRS - Japan Registry Service Co., Ltd. · registered in Japan

IPv4 addresses1,0243 prefixes · <0.001% of announced IPv4

Rank in Japan#539largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#35,613of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryJapan745 ASNs registered there

Open AS18149 in ASN lookup Look up an IP in this network (103.47.2.1) All networks in Japan

IPv4 prefixes

All 3 prefixes, in address order.

103.47.2.0/24
202.11.16.0/23
203.208.23.0/24

IPv6 prefixes

All 2 prefixes.

2001:dda::/48
2001:df0:8::/48

Other ASNs named Japan Registry Service Co., Ltd.

2 other networks use the same organisation name; together with AS18149 they announce 1,536 IPv4 addresses.

ASNNameIPv4 addresses

AS23774A-DNS-JP - Japan Registry Service Co., Ltd. JP256

AS24252JPRS-NAYUTA - Japan Registry Service Co., Ltd. JP256

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS55569#536 CRITEO-AS-AP - Criteo APAC1,024

AS37900#537 MATSURI - NTT DOCOMO BUSINESS, Inc.1,024

AS55907#538 GMO-DNS-R1 - GMO Internet, Inc.1,024

AS37904#540 BBIX-NETWORK - BBIX, Inc.1,024

AS4774#541 ABONE-AS - A-Bone by Internet Initiative Japan Inc.1,024

AS18091#542 TEIKYO-U - Teikyo University1,024

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