AS23774 Japan Registry Service Co., Ltd.

A-DNS-JP - Japan Registry Service Co., Ltd. · registered in Japan

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in Japan#635largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#59,122of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryJapan745 ASNs registered there

Open AS23774 in ASN lookup Look up an IP in this network (203.119.1.1) All networks in Japan

IPv4 prefixes

All 1 prefix, in address order.

203.119.1.0/24

IPv6 prefixes

All 1 prefix.

2001:dc4::/32

Other ASNs named Japan Registry Service Co., Ltd.

2 other networks use the same organisation name; together with AS23774 they announce 1,536 IPv4 addresses.

ASNNameIPv4 addresses

AS18149JPRS - Japan Registry Service Co., Ltd. JP1,024

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

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS151390#632 RUTILEA-A - RUTILEA, Inc.512

AS152872#633 VL-NET - VirtualLink Networks512

AS38215#634 SYUHEIUDA-AS-AP - Syuhei Uda256

AS24252#636 JPRS-NAYUTA - Japan Registry Service Co., Ltd.256

AS37906#637 NETIRD-2 - GMO NetIRD, Inc.256

AS131976#638 JPNAP-WEST - INTERNET MULTIFEED CO.256

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