AS131905 Japan Registry Services Co., Ltd.

JPRS-GTLD - Japan Registry Services Co., Ltd. · registered in Japan

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

Rank in Japan#526largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#30,640of 79,396 networks with IPv4

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

CountryJapan745 ASNs registered there

Open AS131905 in ASN lookup Look up an IP in this network (103.198.208.1) All networks in Japan

IPv4 prefixes

All 3 prefixes, in address order.

103.198.208.0/23
103.198.210.0/24
219.100.72.0/24

IPv6 prefixes

All 1 prefix.

2403:2880::/32

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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