FTTH｜Internet Service Provider in Japan - English Signup and English Customer Service

Asahi Net provides IPv6 Connection Feature to all fiber-optic connection services as a standard feature.
This feature will bring you an enhanced network quality and usability.
Asahi Net invites you to experience the high capacity IPv6 network that we offer.

What is IPv6?

Related Pages

• IPv6 Connection Feature - Operating Environment

• IPv6 Connection Status

• If you received an email notifying registration for IPv6 was uncompleted

Asahi Net now offers a high capacity IPv6 Network bringing you an enhanced network!

• Asahi Net offers high capacity IPv6 network to bring an improved internet experience for our customers. Please note that the internet communication speed is not guaranteed as it depends on multiple factors such as the destination address, the condition and the hours of the day in which the internet connection is made.
• Depending on the operating environment, settings related to IPv6 may be required.
• IPv6 connection is available when the accessed sites support IPv6. Connection will be with IPv4 when IPv6 is not supported at the accessed sites.

• Asahi Net FTTH with FLET’S (Home Course/Mansion Course)
• Asahi Net docomo Hikari (Family Course/Mansion Course)
• FLET'S Hikari Next (Family Course/Mansion Course)
• FLET'S Hikari Light (Family Course)

• IPv6 is also available for B FLET’S (Family Course/Mansion Course) users with FLET’S Hikari Next lines.

IPv6 Non-Supported Coursesarrow

IPv6 Connection in Asahi Net au Hikari Coursearrow

• Check your NTT customer ID

  Check your NTT customer ID

  Please have your NTT customer ID ready for registration. (Shown as お客さまID in Japanese.) NTT customer ID is written on a document sent from NTT East/NTT West by post when you signed up for a fiber-optic line with NTT.

  This step is not required for users of Asahi Net FTTH with FLET’S and Asahi Net docomo Hikari.

  NTT East users

  

  Above is an example of 開通のご案内 (Notice of line connection completed) sent by post from NTT East, in which you can find your NTT customer ID shown as お客さまID.
  Reference: NTT East (Japanese)

  NTT West users

  

  Above is an example of お申し込み内容のご案内 (Account description) sent by post from NTT West, in which you can find your NTT customer ID shown as お客さまID.
  Reference: NTT West (Japanese)

  If you forgot your NTT customer IDarrow

  NTT East Users

  Please contact NTT East to re-issue your NTT customer ID.

  NTT East Contact (English)
  Phone: 0120-565-950 (from mobile phones and landlines)
  Hours: Monday-Friday, 9:00 a.m.-5:00 p.m.
  

  • Closed on national holidays and New Year's holidays
  • Please note that NTT Technical support is not available in English.

  Reference:

  NTT East

  What is NTT East?

  NTT West Users

  Please contact NTT West to re-issue your NTT customer ID.

  NTT West Information (English)
  Phone: 0120-064-337 (from mobile phones and landlines)
  Hours: Monday-Friday, 9:00 a.m.-5:00 p.m.
  

  • Closed on national holidays and New Year's holidays

  Reference:

  NTT West

  What is NTT West?

• Steps to start using IPv6

  Steps to start using IPv6

  Please read before registration.

  1.Proxy application for FLET’S v6 Option

  In order to use the IPv6 Connection Feature, you need to apply for FLET’S v6 Option service provided from NTT East/NTT West (free of charge.) Here, we ask for your authorization for Asahi Net to make a proxy application of FLET’S v6 Option service provided by either by NTT East or NTT West.

  2.Please check the email sent from Asahi Net

  After you register for IPv6 Connection Feature, Asahi Net will send you an email to your Asahi Net Email address (@asahinet.jp or @asahi-net.or.jp) notifying you that registration has been accepted. If you have entered other email address for this registration process, an email will be sent to that address as well.

  Once IPv6 Connection Feature is ready to be used, you will be notified by email.

  3.A document sent to Asahi Net customers from NTT after the registration

  When registration for FLET'S v6 Option service is completed either with NTT East or NTT West, they will send you a document by post. Once you have received the document, please check it and then keep it in a safe place for future reference.

  A document sent to Asahi Net customers from NTT

  4.A possible effect after starting to use IPv6 Connection Feature

  Although such case can be rare, you may experience a temporary disconnection when you start using the IPv6 Connection Feature. If this happens, please reboot your computer, router and other relevant devices. For details, please refer to the Notes.

  Proceed to registration for IPv6 Connection Feature

  • [Individual Members] Please have your Asahi Net User ID and password ready. Click here, if you have forgotten your ID or password.

• Start to use IPv6 Connection

  Start to use IPv6 Connection

  You can begin to use IPv6 Connection Feature as soon as you receive an email from Asahi Net notifying the start of the service. Changes to the internet connection settings are not required.

  You can check online, whether connection is made via IPv6.

  IPv6 Connection Status

  If you have received a notice for registration uncompletedarrow

  In case registration of IPv6 Connection Feature is not completed, Asahi Net will notify you via email.

  If you have received such a notice, please kindly refer to the following page to register for the service once again.

  Using IPv6 Connection Feature

  Done

• What is IPv6?

  IPv6 stands for Internet Protocol version 6. It is the next generation Internet protocol following the IPv4, which is currently the standard protocol. As it has a vast address space, IP addresses can be assigned to substantial number of devices.

• What is the advantage of using IPv6?

  Using IPv6 along with the conventional IPv4 will make Internet connection service higher in quality.

  The explosive growth of Internet users and devices is resulting in shortage of IPv4 addresses, known as IPv4 address exhaustion. IPv6 provides greater address availability, which allows assigning of IP addresses to more devices. IPv6 has become inevitable for the growth of internet.

• Would IPv6 possibly improve the communication speed?

  Since the speed generally vary by multiple factors such as situations at communicating counterparts, surrounding conditions and traffic status, we cannot answer it only with the use of IPv6. But since the IPv6 network has a relatively wider capacity than IPv4, there is a possibility that the speed may improve in case of slowdowns due to IPv4 traffic congestion.

• Where can I find my NTT customer ID, which is required for the registration of IPv6 Connection Feature?

  You can find your NTT customer ID (Written as お客さまID in Japanese. It starts with either CAF followed by ten digits, or COP followed by eight digits) on the contract document you received from NTT when you signed-up with them. If you are an Asahi Net docomo Hikari user, please refer to the relevant document issued from NTT docomo. Please refer to Steps to start Using IPv6 - STEP 1. Check your NTT customer ID.

• I am using Asahi Net’s Course that does not support IPv6 Connection Feature. What should I do if I want to use the IPv6 Connection Feature?

  You can use IPv6 Connection Feature by changing your Course to that supports IPv6 Connection Feature.

  Individual Members Change Course

• How can I check whether IPv6 Connection Feature is ready to use or not? Where can I check my status?

  You can check the availability status of IPv6 Connection Feature in MyPage.
  Please login to the page below to check the Availability Status of IPv6. If Ready to Use is indicated, IPv6 Connection Feature can be used.

  Individual Members Change Course

• I received an email message from Asahi Net notifying "registration was not completed." What should I do?

  We send email notices to those whose registration for IPv6 Connection Feature was not completed. Please kindly refer to Using IPv6 Connection Feature and follow the instruction.

• Do I need any devices to use IPv6?

  Hikari Denwa router supplied from NTT East or NTT West can be used as is.

  (Reference) List of IPv6 compatible routers supplied from NTT East/NTT West

  If you are using an off-the-shelf router, please refer to the user’s guide of the router to check whether it supports IPv6 feature.

• I am currently using an application that requires port forwarding configuration for IPv4. Will I not be able to configure port forwarding if I apply for IPoE service?

  You will be able to continue using port forwarding configuration even after you apply for the IPoE service. Please note that there is an exception on outbound port 25, which cannot be used to prevent spams. For details, please refer to our Members Support page on Outbound Port 25 Blocking (OP25B.)

• After I apply for IPoE service, can I still use devices (some of the game devices, surveillance cameras, etc.) that only support IPv4 connection?

  Yes, you can still connect to internet via IPv4 using devices that only support IPv4 connection. If you are simultaneously using devices that only support IPv4 and computers and smartphones that support IPv6, you will be able to use IPv6 connection with computers and smartphones that support IPv6. In such case, you need to be using a router that supports IPv6; please check the specification of your router.

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