Open Computer Network

Country Japan Japan
Assigned AS N/A
Updated 02 March 2026

We found 860 IPv4 networks operated by this organization. The first 100 networks are displayed.

Results sorted by network size.

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Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 60.32.0.0/12
IP Range: 60.32.0.0 - 60.47.255.255
Block size: 1,048,576
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 114.144.0.0/12
IP Range: 114.144.0.0 - 114.159.255.255
Block size: 1,048,576
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 118.0.0.0/12
IP Range: 118.0.0.0 - 118.15.255.255
Block size: 1,048,576
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 122.16.0.0/12
IP Range: 122.16.0.0 - 122.31.255.255
Block size: 1,048,576
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 58.88.0.0/13
IP Range: 58.88.0.0 - 58.95.255.255
Block size: 524,288
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 123.216.0.0/13
IP Range: 123.216.0.0 - 123.223.255.255
Block size: 524,288
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 124.96.0.0/13
IP Range: 124.96.0.0 - 124.103.255.255
Block size: 524,288
Japan Open Computer Network
OCN Provided By NTT-Communications which is ISP in Chiyoda-ku, Tokyo, Japan
Network: OCN-JPNIC-JP
CIDR: 220.104.0.0/13
IP Range: 220.104.0.0 - 220.111.255.255
Block size: 524,288
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 221.184.0.0/13
IP Range: 221.184.0.0 - 221.191.255.255
Block size: 524,288
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 222.144.0.0/13
IP Range: 222.144.0.0 - 222.151.255.255
Block size: 524,288
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 123.224.0.0/14
IP Range: 123.224.0.0 - 123.227.255.255
Block size: 262,144
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 124.84.0.0/14
IP Range: 124.84.0.0 - 124.87.255.255
Block size: 262,144
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 125.172.0.0/14
IP Range: 125.172.0.0 - 125.175.255.255
Block size: 262,144
Japan Open Computer Network
OCN Provided By NTT-Communications which is ISP in Chiyoda-ku, Tokyo, Japan
Network: OCN-JPNIC-JP
CIDR: 220.96.0.0/14
IP Range: 220.96.0.0 - 220.99.255.255
Block size: 262,144
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 58.88.0.0/15
IP Range: 58.88.0.0 - 58.89.255.255
Block size: 131,072
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 58.90.0.0/15
IP Range: 58.90.0.0 - 58.91.255.255
Block size: 131,072
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 61.112.0.0/16
IP Range: 61.112.0.0 - 61.112.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 61.126.0.0/16
IP Range: 61.126.0.0 - 61.126.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 61.199.0.0/16
IP Range: 61.199.0.0 - 61.199.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 61.207.0.0/16
IP Range: 61.207.0.0 - 61.207.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 61.214.0.0/16
IP Range: 61.214.0.0 - 61.214.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
OTEMACHI PLACE WEST TOWER 2-3-1 Otemachi Chiyoda-ku, Tokyo 100-8019 Japan
Network: OCN
CIDR: 125.170.0.0/16
IP Range: 125.170.0.0 - 125.170.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 153.247.0.0/16
IP Range: 153.247.0.0 - 153.247.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 153.253.0.0/16
IP Range: 153.253.0.0 - 153.253.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 211.122.0.0/16
IP Range: 211.122.0.0 - 211.122.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 211.129.0.0/16
IP Range: 211.129.0.0 - 211.129.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 218.43.0.0/16
IP Range: 218.43.0.0 - 218.43.255.255
Block size: 65,536
Japan NTT DOCOMO BUSINESS, Inc
Network: OCN-CIDR-BLK-JP
CIDR: 218.224.0.0/16
IP Range: 218.224.0.0 - 218.224.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 219.160.0.0/16
IP Range: 219.160.0.0 - 219.160.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 219.162.0.0/16
IP Range: 219.162.0.0 - 219.162.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.96.0.0/16
IP Range: 220.96.0.0 - 220.96.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.97.0.0/16
IP Range: 220.97.0.0 - 220.97.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.98.0.0/16
IP Range: 220.98.0.0 - 220.98.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.104.0.0/16
IP Range: 220.104.0.0 - 220.104.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.105.0.0/16
IP Range: 220.105.0.0 - 220.105.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.106.0.0/16
IP Range: 220.106.0.0 - 220.106.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: 220.107.0.0/16
IP Range: 220.107.0.0 - 220.107.255.255
Block size: 65,536
Network: PLALA
CIDR: 220.108.0.0/16
IP Range: 220.108.0.0 - 220.108.255.255
Block size: 65,536
Japan Open Computer Network
Network: OCN
CIDR: N/A
IP Range: 211.129.12.0 - 211.129.255.255
Block size: 62,464
Japan Open Computer Network
Network: OCN
CIDR: N/A
IP Range: 61.112.46.0 - 61.112.255.255
Block size: 53,760
Network: PLALA
CIDR: N/A
IP Range: 220.109.0.0 - 220.109.208.255
Block size: 53,504
Japan Open Computer Network
Network: OCN
CIDR: N/A
IP Range: 61.126.72.0 - 61.126.255.255
Block size: 47,104
Japan Open Computer Network
Network: OCN
CIDR: 58.88.0.0/17
IP Range: 58.88.0.0 - 58.88.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.88.128.0/17
IP Range: 58.88.128.0 - 58.88.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.90.0.0/17
IP Range: 58.90.0.0 - 58.90.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.90.128.0/17
IP Range: 58.90.128.0 - 58.90.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.91.0.0/17
IP Range: 58.91.0.0 - 58.91.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.91.128.0/17
IP Range: 58.91.128.0 - 58.91.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 58.92.128.0/17
IP Range: 58.92.128.0 - 58.92.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.33.0.0/17
IP Range: 60.33.0.0 - 60.33.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.33.128.0/17
IP Range: 60.33.128.0 - 60.33.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.37.128.0/17
IP Range: 60.37.128.0 - 60.37.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.38.0.0/17
IP Range: 60.38.0.0 - 60.38.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.38.128.0/17
IP Range: 60.38.128.0 - 60.38.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.39.0.0/17
IP Range: 60.39.0.0 - 60.39.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.39.128.0/17
IP Range: 60.39.128.0 - 60.39.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.40.0.0/17
IP Range: 60.40.0.0 - 60.40.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.40.128.0/17
IP Range: 60.40.128.0 - 60.40.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.44.0.0/17
IP Range: 60.44.0.0 - 60.44.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.44.128.0/17
IP Range: 60.44.128.0 - 60.44.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.45.0.0/17
IP Range: 60.45.0.0 - 60.45.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.45.128.0/17
IP Range: 60.45.128.0 - 60.45.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 60.46.0.0/17
IP Range: 60.46.0.0 - 60.46.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 61.119.128.0/17
IP Range: 61.119.128.0 - 61.119.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 61.199.0.0/17
IP Range: 61.199.0.0 - 61.199.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 61.214.0.0/17
IP Range: 61.214.0.0 - 61.214.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.144.0.0/17
IP Range: 114.144.0.0 - 114.144.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.144.128.0/17
IP Range: 114.144.128.0 - 114.144.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.145.0.0/17
IP Range: 114.145.0.0 - 114.145.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.145.128.0/17
IP Range: 114.145.128.0 - 114.145.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.146.128.0/17
IP Range: 114.146.128.0 - 114.146.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.147.0.0/17
IP Range: 114.147.0.0 - 114.147.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.147.128.0/17
IP Range: 114.147.128.0 - 114.147.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.151.0.0/17
IP Range: 114.151.0.0 - 114.151.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.151.128.0/17
IP Range: 114.151.128.0 - 114.151.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.152.0.0/17
IP Range: 114.152.0.0 - 114.152.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.152.128.0/17
IP Range: 114.152.128.0 - 114.152.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.153.0.0/17
IP Range: 114.153.0.0 - 114.153.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.153.128.0/17
IP Range: 114.153.128.0 - 114.153.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.154.0.0/17
IP Range: 114.154.0.0 - 114.154.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.154.128.0/17
IP Range: 114.154.128.0 - 114.154.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.155.0.0/17
IP Range: 114.155.0.0 - 114.155.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.155.128.0/17
IP Range: 114.155.128.0 - 114.155.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.157.0.0/17
IP Range: 114.157.0.0 - 114.157.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.158.0.0/17
IP Range: 114.158.0.0 - 114.158.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.158.128.0/17
IP Range: 114.158.128.0 - 114.158.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.159.0.0/17
IP Range: 114.159.0.0 - 114.159.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.159.128.0/17
IP Range: 114.159.128.0 - 114.159.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.161.0.0/17
IP Range: 114.161.0.0 - 114.161.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.161.128.0/17
IP Range: 114.161.128.0 - 114.161.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.162.0.0/17
IP Range: 114.162.0.0 - 114.162.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.162.128.0/17
IP Range: 114.162.128.0 - 114.162.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.163.0.0/17
IP Range: 114.163.0.0 - 114.163.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.163.128.0/17
IP Range: 114.163.128.0 - 114.163.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.164.0.0/17
IP Range: 114.164.0.0 - 114.164.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.164.128.0/17
IP Range: 114.164.128.0 - 114.164.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.165.0.0/17
IP Range: 114.165.0.0 - 114.165.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.165.128.0/17
IP Range: 114.165.128.0 - 114.165.255.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.166.0.0/17
IP Range: 114.166.0.0 - 114.166.127.255
Block size: 32,768
Japan Open Computer Network
Network: OCN
CIDR: 114.166.128.0/17
IP Range: 114.166.128.0 - 114.166.255.255
Block size: 32,768
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