AS4729 Japan Atomic Energy Agency

JAEA - Japan Atomic Energy Agency · registered in Japan

IPv4 addresses131,0722 prefixes · 0.004% of announced IPv4

Rank in Japan#65largest network in JP by IPv4 space, of 724 · 0.08% of JP

Rank worldwide#1,592of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS4729 in ASN lookup Look up an IP in this network (133.53.0.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

133.53.0.0/16
133.188.0.0/16

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS17687#62 NICE - National University Corporation Nagoya University131,328

AS38635#63 KEIO-NET - Keio University131,072

AS9355#64 NICT - National Institute of Information and Communications Technology131,072

AS63802#66 MIKAKA-EAST - Nippon Telegraph and Telephone East Corporation131,072

AS7516#67 TOHKNET - TOHKnet Co.,Inc.119,040

AS24572#68 YAHOO-JP-AS-AP - Yahoo Japan118,784

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