June 2, 2011
SOFTBANK TELECOM Corp.

About World IPv6 Day

Dear Customer,

 Thank you very much for using SpinNet.

 Due to expanding the Internet services and increasing the number of people using the Internet along with the popularization of broadband, it is said that IPv4 addresses (IPv4 is the standard of the Internet Protocol) will be depleted from 2011 to 2012 because we have consumed it too much.

Switching to IPv6 has been considered all over the world. As a result of this, it has been decided that "World IPv6 Day" will take place. It is a global-scale test flight of IPv6 being led by the Internet Society(ISOC *1).

Please allow us to inform you of this news because this may cause some trouble using the Internet.

*1 The Internet Society (ISOC) is a nonprofit organization to provide leadership in Internet related standards, education and policy.

Description:

1. Overview

You may have some trouble with using the Internet when you access to "World IPv6 Day" participants' websites on "World IPv6 Day", that is IPv6 worldwide trial test.

2. Date

9:00 a.m. on June 8 (Wed.) - 8:59 a.m. on June 9 (Thu.)

3. List of main participants

- Yahoo! JAPAN (www.yahoo.co.jp)
- Google (www.google.com, www.google.co.jp)
- YouTube (www.youtube.com)
- Facebook (www.facebook.com)

Please see the homepage below to get more detail of participants.
Internet Society : http://www.worldipv6day.org/participants/index.html
4. Information

Task Force on IPv4 Address exhaustion, Japan
About World IPv6 Day
http://www.kokatsu.jp/blog/ipv4/news/2011/04/ispworld-ipv6-day.html

Japan Internet Providers Association
About World IPv6 Day (Japanese only)
http://www.jaipa.or.jp/ipv6day/

Microsoft Japan Co., Ltd
[Important]About World IPv6 Day (Japanese only)
http://www.microsoft.com/japan/mscorp/mic/interop/ipv6ie.aspx



Link

SOFTBANK TELECOM Corp.
About World IPv6 Day (Japanese only)
http://tm.softbank.jp/information/110602.html

SOFTBANK MOBILE Corp.
About World IPv6 Day (Japanese only)
http://mb.softbank.jp/mb/information/details/110607.html