AS17977 NF Park Bldg.3F, 9-15, Futaba 2-Chome

SINGTEL-JP - NF Park Bldg.3F, 9-15, Futaba 2-Chome · registered in Japan

IPv4 addresses7,6804 prefixes · <0.001% of announced IPv4

Rank in Japan#342largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#11,150of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS17977 in ASN lookup Look up an IP in this network (120.72.66.1) All networks in Japan

IPv4 prefixes

All 4 prefixes, in address order.

120.72.66.0/23
120.72.68.0/22
120.72.72.0/21
203.173.64.0/20

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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