AS2907 Research Organization of Information and Systems, National Institute of Informatics

SINET-AS - Research Organization of Information and Systems, National Institute of Informatics · registered in Japan

IPv4 addresses8,765,504575 prefixes · 0.280% of announced IPv4

Rank in Japan#4largest network in JP by IPv4 space, of 724 · 5.43% of JP

Rank worldwide#49of 79,396 networks with IPv4

IPv62 x /32 (131,072 x /48)2 prefixes

CountryJapan745 ASNs registered there

Open AS2907 in ASN lookup Look up an IP in this network (103.164.74.1) All networks in Japan

IPv4 prefixes

First 500 of 575 prefixes, in address order.

103.164.74.0/23
103.164.166.0/23
103.164.168.0/23
103.180.128.0/23
130.34.0.0/16
130.153.0.0/16
131.206.0.0/16
133.7.0.0/16
133.8.0.0/16
133.10.0.0/16
133.12.0.0/16
133.14.0.0/15
133.16.0.0/16
133.17.0.0/21
133.17.8.0/23
133.17.10.0/24
133.17.11.0/24
133.17.12.0/22
133.17.16.0/20
133.17.32.0/19
133.17.64.0/18
133.17.128.0/17
133.20.0.0/15
133.23.0.0/16
133.29.0.0/16
133.30.0.0/16
133.32.100.0/22
133.34.0.0/15
133.37.0.0/16
133.38.0.0/15
133.44.0.0/15
133.46.0.0/16
133.48.0.0/15
133.52.0.0/16
133.54.0.0/18
133.54.64.0/21
133.54.76.0/22
133.54.80.0/20
133.54.96.0/19
133.54.128.0/17
133.55.0.0/16
133.57.0.0/16
133.58.0.0/16
133.60.0.0/16
133.62.0.0/15
133.65.0.0/16
133.68.0.0/16
133.72.0.0/15
133.74.192.0/18
133.77.0.0/16
133.78.0.0/16
133.81.0.0/16
133.82.0.0/15
133.84.0.0/15
133.86.0.0/17
133.86.128.0/18
133.86.192.0/19
133.86.224.0/20
133.86.240.0/21
133.86.248.0/24
133.86.249.0/24
133.86.250.0/24
133.86.251.0/24
133.86.252.0/22
133.88.224.0/23
133.88.226.0/24
133.89.0.0/16
133.94.0.0/15
133.96.0.0/16
133.98.0.0/15
133.102.0.0/15
133.104.0.0/16
133.106.0.0/21
133.187.0.0/16
133.220.0.0/16
134.160.186.0/23
134.160.188.0/23
136.187.0.0/16
144.213.0.0/16
147.157.0.0/18
147.157.64.0/20
147.157.80.0/22
147.157.84.0/23
147.157.86.0/23
147.157.88.0/21
147.157.96.0/19
147.157.128.0/17
150.7.0.0/20
150.7.16.0/21
150.7.24.0/22
150.7.28.0/24
150.7.29.0/24
150.7.30.0/23
150.7.32.0/19
150.7.64.0/18
150.7.128.0/18
150.7.192.0/19
150.7.224.0/20
150.7.240.0/21
150.7.248.0/23
150.7.250.0/24
150.7.251.0/24
150.7.252.0/22
150.9.254.0/23
150.12.0.0/16
150.15.0.0/16
150.22.0.0/22
150.42.0.0/15
150.46.0.0/16
150.54.0.0/16
150.59.0.0/16
150.69.0.0/16
150.83.0.0/16
150.84.0.0/16
150.86.0.0/16
150.89.0.0/17
150.89.128.0/19
150.89.160.0/20
150.89.176.0/20
150.89.192.0/18
150.97.0.0/16
150.99.0.0/16
150.100.0.0/16
157.1.0.0/16
157.6.0.0/16
157.7.0.0/19
157.13.0.0/17
157.13.128.0/23
157.13.130.0/23
157.13.132.0/22
157.13.136.0/21
157.13.144.0/20
157.13.160.0/19
157.13.192.0/18
157.16.0.0/16
157.17.0.0/19
157.19.0.0/16
157.63.0.0/16
157.76.0.0/16
157.80.0.0/16
157.102.0.0/16
157.105.0.0/16
157.111.0.0/20
157.111.16.0/24
157.111.17.0/24
157.111.18.0/23
157.111.20.0/22
157.111.24.0/21
157.111.32.0/19
157.111.64.0/18
157.111.128.0/17
157.114.0.0/16
158.203.0.0/16
158.208.0.0/16
158.210.0.0/16
158.215.0.0/16
160.11.0.0/16
160.12.0.0/16
160.15.0.0/16
160.18.2.0/24
160.18.100.0/24
160.18.128.0/24
160.18.136.0/23
160.18.148.0/23
160.18.216.0/23
160.18.220.0/23
160.18.224.0/23
160.28.0.0/15
160.190.0.0/16
160.193.0.0/16
160.194.0.0/16
160.198.0.0/16
160.202.0.0/21
160.204.0.0/16
160.237.0.0/18
160.237.192.0/18
160.238.1.0/24
160.238.2.0/23
160.238.4.0/22
160.238.8.0/23
160.238.10.0/24
160.238.20.0/24
160.238.30.0/24
160.238.32.0/24
160.238.40.0/24
160.238.51.0/24
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160.238.100.0/24
160.245.112.0/24
160.247.0.0/16
160.252.0.0/16
163.42.0.0/16
163.47.1.0/24
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163.51.0.0/16
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163.130.0.0/16
163.134.0.0/16
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163.143.0.0/16
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163.148.0.0/16
163.209.0.0/16
163.212.0.0/20
163.212.16.0/21
163.212.24.0/22
163.212.28.0/23
163.212.30.0/23
163.212.32.0/19
163.212.64.0/18
163.212.128.0/17
163.214.0.0/15
163.220.0.0/17
163.220.128.0/19
163.220.176.0/20
163.225.0.0/16
163.226.0.0/16
164.161.0.0/16
165.93.0.0/16
192.31.121.0/24
192.42.103.0/26
192.47.1.0/24
192.47.2.0/23
192.47.16.0/22
192.47.204.0/23
192.50.28.0/24
192.50.30.0/23
192.50.42.0/24
192.50.57.0/24
192.50.69.0/24
192.50.70.0/23
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192.50.102.0/23
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192.50.192.0/23
192.50.210.0/23
192.50.212.0/24
192.51.168.0/22
192.51.194.0/23
192.58.9.0/24
192.58.10.0/23
192.58.12.0/22
192.58.16.0/23
192.58.18.0/24
192.153.95.0/25
192.153.95.128/26
192.153.95.192/26
192.153.96.0/21
192.153.104.0/24
192.156.145.0/24
192.156.146.0/23
192.156.148.0/23
192.156.151.0/24
192.156.158.0/24
192.172.236.0/24
192.174.128.0/17
192.188.73.0/24
192.188.74.0/24
192.218.1.0/24
192.218.92.0/22
192.218.112.0/21
192.218.130.0/24
192.218.160.0/20
192.218.240.0/21
192.244.20.0/23
192.244.78.0/23
192.244.80.0/20
192.244.144.0/20
192.244.196.0/22
192.244.208.0/20
192.244.228.0/22
192.244.254.0/24
202.11.0.0/21
202.11.8.0/22
202.11.96.0/20
202.11.138.0/24
202.11.166.0/23
202.11.212.0/24
202.11.216.0/22
202.13.0.0/22
202.13.4.0/23
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202.13.16.0/21
202.13.60.0/24
202.13.82.0/23
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202.15.16.0/20
202.15.106.0/23
202.15.110.0/24
202.16.122.0/23
202.16.124.0/23
202.16.128.0/20
202.16.208.0/20
202.16.224.0/24
202.17.104.0/21
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202.17.171.0/24
202.17.182.0/24
202.17.184.0/22
202.17.200.0/21
202.17.208.0/22
202.17.254.0/24
202.18.32.0/19
202.18.160.0/21
202.18.168.0/22
202.18.172.0/22
202.18.182.0/24
202.18.184.0/21
202.18.254.0/24
202.19.104.0/23
202.19.136.0/21
202.19.144.0/21
202.19.168.0/21
202.19.179.0/24
202.23.64.0/22
202.23.72.0/21
202.23.86.0/24
202.23.192.0/21
202.23.247.0/24
202.24.52.0/24
202.24.80.0/21
202.24.92.0/22
202.24.140.0/22
202.24.144.0/21
202.24.160.0/21
202.24.240.0/21
202.25.68.0/22
202.25.80.0/23
202.25.86.0/23
202.25.99.0/24
202.25.113.0/24
202.25.155.0/24
202.25.156.0/24
202.25.224.0/20
202.26.64.0/19
202.26.139.0/24
202.26.144.0/20
202.26.160.0/20
202.26.188.0/22
202.26.196.0/22
202.26.224.0/24
202.26.248.0/23
202.34.192.0/20
202.34.232.0/21
202.34.242.0/23
202.34.246.0/23
202.35.192.0/21
202.35.200.0/21
202.35.208.0/20
202.35.224.0/24
202.35.226.0/23
202.35.228.0/24
202.35.248.0/22
202.48.48.0/22
202.48.112.0/21
202.48.128.0/23
202.48.160.0/22
202.48.228.0/22
202.145.16.0/22
202.145.24.0/23
202.175.144.0/20
202.208.8.0/23
202.208.25.0/24
202.209.0.0/16
202.210.0.0/22
202.211.0.0/19
202.213.0.0/22
202.213.24.0/23
202.213.160.0/20
202.216.78.0/24
202.220.0.0/22
202.220.17.0/24
202.220.21.0/25
202.220.21.128/26
202.220.21.192/27
202.220.21.224/28
202.220.21.240/29
202.220.21.248/31
202.220.21.250/32
202.220.21.251/32
202.220.21.252/30
202.220.56.0/22
202.220.62.0/23
202.220.64.0/22
202.220.72.0/22
202.220.80.0/24
202.220.104.0/23
202.220.116.0/23
202.220.118.0/24
202.220.124.0/22
202.223.128.0/18
202.223.192.0/19
202.223.224.0/22
202.223.228.0/23
202.223.232.0/21
202.223.240.0/20
202.231.0.0/18
202.235.128.0/18
202.236.2.0/24
202.236.16.0/24
202.236.33.0/24
202.236.44.0/24
202.236.60.0/23
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202.236.106.0/24
202.236.107.0/26
202.236.107.64/27
202.236.107.96/28
202.236.107.112/28
202.236.107.128/25
202.236.111.0/24
202.236.112.0/22
202.236.120.0/24
202.236.124.0/24
202.236.128.0/20
202.236.150.0/23
202.236.168.0/21
202.236.176.0/22
202.236.188.0/22
202.237.2.0/23
202.237.6.0/23
202.237.15.0/24
202.237.24.0/24
202.237.27.0/24
202.237.40.0/24
202.237.52.0/22
202.237.132.0/24
202.237.168.0/23
202.237.174.0/24
202.237.255.0/24
202.240.8.0/21
202.240.72.0/21
202.240.96.0/22
202.240.112.0/22
202.240.117.0/24
202.240.137.0/24
202.240.224.0/24
202.240.232.0/24
202.241.0.0/17
202.242.5.0/24
202.242.7.0/24
202.242.8.0/21
202.242.21.0/24
202.242.38.0/23
202.242.55.0/24
202.242.64.0/21
202.242.101.0/24
202.242.120.0/23
202.242.127.0/24
202.242.131.0/24
202.242.160.0/19
202.242.192.0/22
202.242.231.0/24
202.243.16.0/20
202.243.128.0/20
202.243.162.0/23
202.243.185.0/24
202.243.220.0/23
202.243.222.0/24
202.243.234.0/23
202.244.3.0/24
202.244.52.0/22
202.244.62.0/24
202.244.76.0/22
202.244.90.0/23
202.244.104.0/23
202.244.112.0/20
202.244.160.0/19
202.244.192.0/21
202.244.205.0/24
202.244.210.0/24
202.244.240.0/20
202.245.2.0/23
202.245.11.0/24
202.245.13.0/24
202.245.24.0/23
202.245.64.0/19
202.245.100.0/22
202.245.104.0/23
202.245.115.0/24
202.245.116.0/23
202.245.118.0/24
202.245.124.0/24
202.245.136.0/23
202.245.165.0/24
202.245.168.0/22
202.245.212.0/22
202.245.226.0/23
202.246.63.0/24
202.246.68.0/24
202.246.106.0/23
202.246.128.0/22
202.246.132.0/25
202.246.132.128/25
202.246.133.0/24
202.246.134.0/23
202.246.136.0/24

IPv6 prefixes

All 2 prefixes.

2001:2f8::/32
2405:d200::/32

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS17676#1 GIGAINFRA - SoftBank Corp.38,445,056

AS4713#2 OCN - NTT DOCOMO BUSINESS,Inc.28,623,360

AS2516#3 KDDI - KDDI CORPORATION18,072,320

AS17506#5 UCOM - ARTERIA Networks Corporation5,382,143

AS9824#6 JTCL-JP-AS - JCOM Co., Ltd.4,745,216

AS2497#7 IIJ - Internet Initiative Japan Inc.4,094,976

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