AS2511 Nippon Telegraph and Telephone Corporation

CORE - Nippon Telegraph and Telephone Corporation · registered in Japan

IPv4 addresses41,7285 prefixes · 0.001% of announced IPv4

Rank in Japan#190largest network in JP by IPv4 space, of 724 · 0.03% of JP

Rank worldwide#4,232of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS2511 in ASN lookup Look up an IP in this network (163.138.0.1) All networks in Japan

IPv4 prefixes

All 5 prefixes, in address order.

163.138.0.0/17
163.138.128.0/19
192.5.216.0/24
192.26.94.0/24
192.47.167.0/24

Other ASNs named Nippon Telegraph and Telephone Corporation

2 other networks use the same organisation name; together with AS2511 they announce 53,760 IPv4 addresses.

ASNNameIPv4 addresses

AS173NTTECL-AS - Nippon Telegraph and Telephone Corporation JP8,704

AS4697NTTV6NET - Nippon Telegraph and Telephone Corporation JP3,328

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS23785#187 SUNFIELD - SUN FIELD INTERNET LIMITED45,056

AS18136#188 CTA - JCOM Co., Ltd.43,008

AS59125#189 CYBERHOME1 - FAMILY NET JAPAN INCORPORATED41,984

AS7676#191 TAM - TAM Co., Ltd.39,680

AS7690#192 MIRAI - Mirai Communication Network Inc.38,912

AS17530#193 NNS - Nihon Network Service Co, .Ltd.38,912

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