AS4721 — JCN JCOM Co., Ltd.
Network type: residential
AS4721 announces 54 IPv4 prefixes covering 631,808 addresses and 1 IPv6 prefixes.
About this network
JCN is one of the networks of JCOM Co., Ltd. (J:COM), Japan's largest cable television and cable-broadband operator. It carries the name of Japan Cablenet Limited (JCN), the operator J:COM absorbed in 2014.
What it's used for
- Consumer broadband and cable-TV subscriber access on the former JCN footprint, now operated as part of J:COM.
Notable
- This is eyeball address space: several hundred thousand IPv4 addresses handed out to residential cable-internet subscribers, so traffic to it is end users, not servers.
- J:COM took over JCN's shares from KDDI in December 2013 and completed the merger on 1 April 2014; the ASN and its address blocks survived the corporate consolidation under the old handle.
- J:COM runs more than one ASN — this one is specifically the ex-JCN network, not the group's primary AS.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 14.193.0.0/16
- 61.203.224.0/19
- 110.4.48.0/20
- 110.92.80.0/20
- 110.93.0.0/21
- 110.173.240.0/20
- 110.232.0.0/19
- 110.232.128.0/21
- 111.90.0.0/17
- 112.137.32.0/20
- 112.137.64.0/18
- 113.52.16.0/20
- 113.61.112.0/20
- 114.134.112.0/20
- 114.134.192.0/18
- 114.142.128.0/21
- 114.198.192.0/19
- 114.198.224.0/21
- 115.42.96.0/20
- 116.70.128.0/18
- 118.83.0.0/16
- 118.86.0.0/15
- 122.255.128.0/17
- 123.98.224.0/19
- 175.41.64.0/18
- 175.103.12.0/22
- 180.92.32.0/19
- 180.149.160.0/19
- 182.50.192.0/19
- 182.50.224.0/20
- 202.43.16.0/20
- 202.43.68.0/22
- 202.72.64.0/20
- 202.78.176.0/20
- 202.83.184.0/21
- 202.178.80.0/20
- 203.89.32.0/19
- 203.114.248.0/22
- 203.124.64.0/19
- 203.153.56.0/22
- 210.135.192.0/19
- 210.172.240.0/20
- 211.19.208.0/20
- 218.219.80.0/20
- 219.112.192.0/19
- 219.113.96.0/20
- 219.117.0.0/20
- 219.117.160.0/19
- 219.124.224.0/19
- 220.208.64.0/18
- 221.132.128.0/18
- 223.165.20.0/22
- 223.165.32.0/19
- 223.223.208.0/21
- 2001:c30::/32
Upstream networks
- AS9824 JCOM Co., Ltd.
Adjacent networks
- AS9824 JCOM Co., Ltd.
Internet exchanges
- JPIX Tokyo — Tokyo, Japan
- Network Service Provider IXP (Distributed IX in Edo) — Tokyo, Japan
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IPv4
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED