AS173 Nippon Telegraph and Telephone Corporation

NTTECL-AS - Nippon Telegraph and Telephone Corporation · registered in Japan

IPv4 addresses8,7042 prefixes · <0.001% of announced IPv4

Rank in Japan#319largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#9,919of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS173 in ASN lookup Look up an IP in this network (163.138.160.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

163.138.160.0/19
192.47.168.0/23

Other ASNs named Nippon Telegraph and Telephone Corporation

2 other networks use the same organisation name; together with AS173 they announce 53,760 IPv4 addresses.

ASNNameIPv4 addresses

AS2511CORE - Nippon Telegraph and Telephone Corporation JP41,728

AS4697NTTV6NET - Nippon Telegraph and Telephone Corporation JP3,328

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS37908#316 KBC - KIBI Cable Television Co.,Ltd.8,704

AS45687#317 MCT-Internet - Minamikyusyu CableTV Net Inc.8,704

AS131970#318 Hikarinet - Hikarinet Inc.8,704

AS17940#320 CYBERLINKS - CYBER LINKS Co.,Ltd.8,704

AS151387#321 OCTP-NET - OMURA CABLE TELEVISION K.K.8,704

AS45691#322 DODO-CORE - DODO K.K.8,448

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