Supported Courses

Fiber-optic connection services which supports the IPv6 Connection Feature are as follows. Courses not listed below do not support the feature.
Asahi Net au Hikari Course has already been providing internet connection services with IPv6, but please note that this does not refer to IPv6 Connection Feature and therefore it is not listed above.

Feature details

Steps to Start Using

Please read before registration

Only users of FLET'S Hikari Next (Family Course/Mansion Course) and FLET'S Hikari Light (Family Course) need registration to use the IPv6 Connection Feature. Please follow the steps indicated below.

Registration is not required for users of other Courses.
For some users registration may be required, in which case a notification will be sent to their Asahi Net Email address.

1. STEP1

   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 ID

   • 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

     NTT East Area
     Hokkaido, Aomori, Yamagata, Akita, Iwate, Miyagi, Fukushima, Niigata, Gunma, Tochigi, Ibaraki, Saitama, Chiba, Kanagawa, Tokyo, Yamanashi, Nagano

   • 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

     NTT West Area
     Aichi, Shizuoka, Gifu, Mie, Ishikawa, Toyama, Fukui, Osaka, Kyoto, Nara, Shiga, Wakayama, Hyogo, Hiroshima, Okayama, Yamaguchi, Tottori, Shimane, Ehime, Tokushima, Kagawa, Kochi, Fukuoka, Kumamoto, Saga, Nagasaki, Oita, Miyazaki, Kagoshima, Okinawa

2. STEP2

   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.

   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.
3. STEP3

   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 uncompleted

   If the procedure to start using the IPv6 Connection Feature is not completed, Asahi Net will individually send you a notification email.

   If you receive this email, please check the details, and take the necessary procedures.

FAQ

Precautions

Possible impact when FLET'S v6 Option and IPv6 Connection Feature become effective

The following services may become temporarily unavailable, but customers should not be impacted.
If communication becomes unavailable, please check how to handle the respective service.

• Users in East Japan Area
• Users in West Japan Area

NTT East Area
Hokkaido, Aomori, Yamagata, Akita, Iwate, Miyagi, Fukushima, Niigata, Gunma, Tochigi, Ibaraki, Saitama, Chiba, Kanagawa, Tokyo, Yamanashi, Nagno

Service	Remedies
FLET'S Virus Clear v6	Reboot your computer or any other devices you are using
Remote Support Service
Office Marugoto Support (IT support & security)
Hikari Softtown
FLET'S Easy Setup Tool
Service Information Site
FLET'S Market	Reboot FLET'S Market device (such as Hikari i-frame).
Hikari TV	Reboot Hikari TV device
U-NEXT	Reboot U-NEXT device
Earthquake Early Warning - FLET'S type	Reboot the Earthquake Early Warning device
HIKARI DENWA HIKARI DENWA OFFICE type HIKARI DENWA OFFICE A (ACE) *Connection failure may occur in voice/data communication between Hikari Denwa compatible devices using IPv6 for voice/data communication	Cut off voice/data communication and wait for about one minute (No other action required)

NTT West Area
Aichi, Shizuoka, Gifu, Mie, Ishikawa, Toyama, Fukui, Osaka, Kyoto, Nara, Shiga, Wakayama, Hyogo, Hiroshima, Okayama, Yamaguchi, Tottori, Shimane, Ehime, Tokushima, Kagawa, Kochi, Fukuoka, Kumamoto, Saga, Nagasaki, Oita, Miyazaki, Kagoshima, Okinawa

Service	Remedies
FLET'S Hikari Next "Security Taisaku Tool"	Reboot your computer or any other devices you are using
Remote Support Service
Office Net Omakase Support Service
FLET'S Easy Setup Tool
FLET'S v6 Option
Hikari TV	Reboot the Hikari TV device
U-NEXT	Reboot the U-NEXT device
FLET'S MATOMETE SHIHARAI	Reboot your computer or any other devices you are using
HIKARI DENWA HIKARI DENWA OFFICE type HIKARI DENWA OFFICE A (ACE) *Connection failure may occur in voice/data communication between Hikari Denwa compatible devices using IPv6 for voice/data communication	Cut off voice/data communication and wait for about one minute (No other action required)

Notes for users of FLET'S Hikari Light lines or FLET'S Hikari Light Plus lines

To use Asahi Net's IPv6 Connection Feature, you need to have registered for NTT FLET'S v6 Option. Please note that when you use NTT FLET'S v6 Option, a fixed amount of data traffic will incur on a monthly basis, regardless of the actual amount of internet data traffic.

• For users of FLET'S Hikari Light line, the internet data traffic will be 40 MB/month.
• For users of FLET'S Hikari Light Plus line, the internet data traffic will be 100 MB/month.

If you are using IPoE service provided by another service provider

Please note that Asahi Net's IPv6 Connection Feature cannot be used with another provider's IPv6 IPoE.
To use Asahi Net's IPv6 Connection Feature, please cancel the IPv6 IPoE that you are currently using with another provider, and proceed to register for IPv6 Connection Feature with Asahi Net following the Steps to Start Using IPv6

Notes about implementation of Outbound Port 25 Blocking

As part of our efforts to improve security of our Internet service, Asahi Net has implemented Outbound Port 25 Blocking (OP25B), which blocks the flow of unsolicited bulk emails (spams).
All Asahi Net users connecting to internet with IPv6 are subject to OP25B regardless of which Course you are using. For details, please refer to Outbound Port 25 Blocking page.
We ask your kind understanding on the implementation of OP25B that will lead to improved security.

If you are using VPN employing IPv6 return traffic within the NTT network

If your VPN employs IPv6 return traffic within the NTT network, the routing prefix will change after you begin using Asahi Net's IPv6 Connection Feature.
As such effect can be avoided by using the Name function, we recommend using the Name function for return traffic within the NTT network. For more details on the Name function, please refer to the following pages. (Japanese)

• FLET'S v6 Option | NTT East
• FLET'S v6 Option | NTT West

If you are using a router other than that supplied by NTT

If you are using a router that is not supplied by NTT, please read the user's manual of the router beforehand to check whether your router supports IPv6 function. Please note that IPv6 connection may not be available with some of the routers depending on its function or settings.

If you are connecting to internet without a router

Please note that IPv6 connection may not function normally, if you are connecting to internet using PPPoE feature of the computer.