AS2497 Internet Initiative Japan Inc.

IIJ - Internet Initiative Japan Inc. · registered in Japan

IPv4 addresses4,094,976241 prefixes · 0.131% of announced IPv4

Rank in Japan#7largest network in JP by IPv4 space, of 724 · 2.54% of JP

Rank worldwide#121of 79,396 networks with IPv4

IPv64 x /32 (270,341 x /48)8 prefixes

CountryJapan745 ASNs registered there

Open AS2497 in ASN lookup Look up an IP in this network (14.137.235.1) All networks in Japan

IPv4 prefixes

All 241 prefixes, in address order.

14.137.235.0/24
14.137.243.0/24
23.131.136.0/24
23.159.40.0/24
23.183.56.0/24
43.249.241.0/24
45.38.103.0/24
45.38.104.0/24
45.39.42.0/24
45.39.47.0/24
45.39.102.0/24
45.39.159.0/24
45.39.227.0/24
45.115.35.0/24
45.124.63.0/24
49.239.64.0/18
58.138.0.0/17
58.138.128.0/18
61.122.224.0/20
61.124.0.0/19
61.211.96.0/19
79.170.199.0/24
80.47.64.0/20
80.47.80.0/21
80.47.88.0/22
80.47.92.0/23
80.47.94.0/24
81.203.0.0/16
89.30.176.0/23
101.128.128.0/17
103.2.57.0/24
103.2.58.0/23
103.5.23.0/24
103.6.20.0/23
103.6.22.0/24
103.11.239.0/24
103.26.166.0/23
103.76.87.0/24
103.140.136.0/23
103.245.235.0/24
104.164.85.0/24
104.164.92.0/24
104.164.100.0/24
104.164.132.0/23
104.165.87.0/24
104.165.174.0/24
104.165.181.0/24
104.165.202.0/24
104.165.254.0/24
104.252.22.0/24
104.252.84.0/22
104.252.125.0/24
104.252.126.0/24
104.252.132.0/24
104.253.94.0/24
104.253.98.0/24
104.253.239.0/24
109.66.30.0/23
113.197.128.0/17
116.118.192.0/20
118.151.0.0/17
118.151.128.0/18
119.10.192.0/18
121.50.160.0/21
121.102.0.0/16
121.200.200.0/21
124.41.0.0/17
124.41.128.0/18
124.147.64.0/18
125.30.0.0/16
129.249.0.0/16
131.248.0.0/16
132.179.0.0/16
133.110.0.0/15
133.127.0.0/16
133.137.0.0/16
133.142.0.0/16
133.157.32.0/19
133.157.72.0/21
133.157.80.0/20
133.157.96.0/19
133.159.0.0/16
133.169.0.0/21
133.169.8.0/22
133.173.0.0/16
133.183.96.0/21
133.183.106.0/24
133.183.128.0/19
133.194.0.0/17
133.194.128.0/18
133.194.192.0/19
133.194.224.0/20
133.194.240.0/21
133.194.248.0/22
133.194.252.0/23
133.194.254.0/24
133.215.0.0/16
133.218.0.0/16
133.221.0.0/22
133.221.4.0/22
133.221.8.0/21
133.221.16.0/20
133.221.32.0/19
133.221.64.0/18
133.221.128.0/17
133.236.0.0/16
133.238.8.0/21
133.238.16.0/20
133.238.32.0/19
133.238.128.0/17
133.245.0.0/16
133.254.0.0/16
134.237.0.0/16
138.107.0.0/16
139.152.0.0/21
139.152.8.0/22
139.152.12.0/22
139.152.16.0/20
139.152.32.0/19
139.152.64.0/18
139.152.128.0/17
142.252.252.0/22
143.94.0.0/17
143.94.128.0/18
143.94.192.0/20
143.94.208.0/21
143.94.216.0/23
143.94.218.0/23
143.94.220.0/22
143.94.224.0/19
143.125.0.0/17
143.125.128.0/18
143.125.192.0/20
143.125.208.0/22
150.23.0.0/16
150.31.0.0/16
150.61.5.0/24
150.61.54.0/23
150.87.0.0/16
150.90.0.0/16
156.9.112.0/23
156.9.114.0/24
157.65.8.0/21
157.65.176.0/21
157.65.192.0/21
157.67.0.0/16
160.13.0.0/16
160.17.0.0/16
160.244.0.0/16
163.49.0.0/16
163.55.0.0/16
163.140.0.0/16
163.218.0.0/16
164.37.196.0/23
167.169.0.0/16
172.120.14.0/24
172.120.69.0/24
172.121.39.0/24
172.122.0.0/15
178.239.124.0/23
178.239.126.0/24
182.54.240.0/22
192.6.164.0/23
192.47.161.0/24
192.50.252.0/23
192.70.131.0/24
192.244.8.0/21
202.15.44.0/23
202.19.224.0/21
202.22.208.0/20
202.24.192.0/22
202.24.196.0/24
202.32.0.0/16
202.48.108.0/23
202.141.192.0/20
202.155.129.0/24
202.155.130.0/24
202.214.0.0/16
202.221.0.0/16
202.224.128.0/18
202.232.0.0/16
202.238.128.0/17
202.242.16.0/23
202.244.222.0/24
202.245.176.0/20
202.250.154.0/23
202.251.0.0/19
202.253.160.0/22
203.139.224.0/19
203.180.0.0/16
206.132.160.0/20
210.128.0.0/16
210.130.0.0/17
210.130.128.0/18
210.130.192.0/20
210.130.208.0/23
210.130.211.0/24
210.130.212.0/22
210.130.216.0/21
210.130.225.0/24
210.130.226.0/23
210.130.228.0/22
210.130.232.0/21
210.130.240.0/20
210.133.192.0/18
210.138.0.0/16
210.141.16.0/20
210.148.0.0/17
210.148.132.0/22
210.148.136.0/21
210.148.144.0/20
210.148.160.0/19
210.148.192.0/18
210.149.0.0/16
210.173.0.0/19
210.233.160.0/24
210.233.162.0/23
210.233.165.0/24
210.233.166.0/23
210.233.168.0/22
210.233.173.0/24
210.233.174.0/23
210.233.176.0/21
210.233.184.0/22
210.233.188.0/23
210.233.190.0/24
211.14.32.0/19
216.98.96.0/19
218.42.160.0/19
218.228.96.0/19
219.105.0.0/19
219.111.0.0/17
219.119.0.0/16
219.121.160.0/19
219.126.128.0/17
220.100.0.0/17
220.100.192.0/18
220.156.0.0/17
220.156.128.0/19
220.208.192.0/19
220.210.128.0/18

IPv6 prefixes

All 8 prefixes.

2001:240::/32
2001:300::/32
2001:48b0::/32
2400:3980::/32
2401:ce20:c::/47
2401:ce20:e::/48
2403:5700::/47
240a:71:8000::/35

Other ASNs named Internet Initiative Japan Inc.

1 other network uses the same organisation name; together with AS2497 they announce 4,095,232 IPv4 addresses.

ASNNameIPv4 addresses

AS9434ABONE-AS-AP - Internet Initiative Japan, Inc. JP256

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS2907#4 SINET-AS - Research Organization of Information and Systems, National Institute of Informatics8,765,504

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

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

AS2527#8 So-net - Sony Network Communications Inc.3,867,648

AS2518#9 BIGLOBE - BIGLOBE Inc.3,670,016

AS17511#10 OPTAGE - OPTAGE Inc.2,994,432

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