AS51044 RHE Kazuki Yamaguchi

RHE Kazuki Yamaguchi · registered in Japan

IPv4 addresses1,0242 prefixes · <0.001% of announced IPv4

Rank in Japan#518largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#30,224of 79,396 networks with IPv4

IPv62 x /32 (131,083 x /48)6 prefixes

CountryJapan745 ASNs registered there

Open AS51044 in ASN lookup Look up an IP in this network (45.148.172.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

45.148.172.0/23
45.148.174.0/23

IPv6 prefixes

All 6 prefixes.

2a0f:600::/48
2a0f:600:604::/46
2a0f:600:608::/46
2a0f:600:60c::/47
2a0f:601::/32
2a0f:602::/32

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS133203#515 SBIBITS-JP - SBI BITS Co., Ltd.1,280

AS55888#516 Nintatsu - Nintatsu Global Telecommunications Corporation1,152

AS55891#517 WBTSJP-AS - WATCH TOWER BIBLE AND TRACT SOCIETY1,024

AS4718#519 CKP - Cyber Kansai Project1,024

AS7500#520 M-ROOT-DNS - WIDE Project1,024

AS38648#521 F-REGI - F-REGI Co.,Ltd.1,024

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