AS133405 RETN Co., Ltd.

RETNKK-AS-AP - RETN Co., Ltd. · registered in Japan

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in Japan#679largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#61,584of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryJapan745 ASNs registered there

Open AS133405 in ASN lookup Look up an IP in this network (163.128.219.1) All networks in Japan

IPv4 prefixes

All 1 prefix, in address order.

163.128.219.0/24

IPv6 prefixes

All 1 prefix.

2001:df6:edc0::/48

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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