OCN (オーシーエヌ), or Open Computer Network(オープン・コンピュータ・ネットワーク:Ōpun Konpyūta nettowāku), is the largest

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

ese

Internet service provider An Internet service provider (ISP) is an organization that provides a myriad of services related to accessing, using, managing, or participating in the Internet. ISPs can be organized in various forms, such as commercial, community-owned, no ...

, with over 7 million subscribers. It is owned by NTT Communications Corp, one of the largest

telecommunication Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...

companies in the world. It offers dial-up and ISDN, DSL up to 50 Mb/s and

fiber Fiber (spelled fibre in British English; from ) is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often inco ...

up to 200 Mbit/s download and 100 Mb/s upload. As a result of regulations intended to promote competition, OCN themselves offer only internet service (routing); the physical line can be offered by NTT (the parent corporation), or by another company. Speeds up to 1 Gb/s are offered in Western Japan, while in East Japan only 200 Mb/s is officially offered for residential use, even though the underlying fiber infrastructure is capable of 1 Gb/s. OCN also offers an MVNO mobile broadband service called "OCN Mobile One", based on NTT Docomo's LTE infrastructure. Initially it started out as a data-only service, but more recently OCN Mobile One also offers an ''onseikake'' SIM card (音声対応SIMカード) that provides full service (data, SMS and voice) without requiring any calling app.

References

External links

Official OCN website

Start of OCN Business Web Service and its Future
at Science Links Japan
NTT communications

OCN known as ocn.ad.jp is also the source of a large number of phishing spam emails and Malware distribution activity

Discussion regarding ocn.ne.jp as a source of spam/malware
Internet service providers of Japan NTT Communications {{japan-company-stub

See also

References

External links