Security Information

Security Information archive

• 2025/04/30

  Monthly Report Update of Email Virus Check (January 2025 to March 2025)

• 2025/03/19

  Monthly Report Update of Email Virus Check (October 2024 to December 2024)

• 2024/10/21

  Monthly Report Update of Email Virus Check (July 2024 to September 2024)

• 2024/08/13

  Monthly Report Update of Email Virus Check (April 2024 to June 2024)

• 2024/06/18

  Monthly Report Update of Email Virus Check (October 2023 to March 2024)

Hidden Threats and How to Handle Risks

Although Internet provides convenience, it can also bring dangers to your life. It is important that you gain correct information and take necessary measures to protect yourself.
We will introduce some of possible threats inherent in the world of web that are not seemingly dangerous, but critical. We will also show example methods to countermeasure these threats.

Threats and how to handle risks

1. 1

   What is computer virus? Points to be ensured and basic countermeasures.

2. 2

   The number of unwanted spam/malicious email is increasing!

3. 3

   Internet fraud is evolving. How does it work and how can we prevent?

4. 4

   Online identity theft. How can we protect ourselves?

5. 5

   Your PC could be the next target! What happens when you are hacked and how to prevent it.

Asahi Net's Policy and Practices for Security

Asahi Net, as one of the major ISPs in Japan, has invested our effort to online security matters, too.
For your safety, we continue to ensure that customer’s personal information is well protected with our enhanced security measures.

Privacy protection and security enhancement

Asahi Net is the ISMS (Information Security Management System) accredited company (ISO/IEC 27001: 2022) which takes proactive measures to constantly challenge security issues online.

To ensure our customers' peace of mind

Asahi Net's security measures

Outbound Port 25 Blocking

In order to provide secure internet environment for all users, Asahi Net is blocking port 25, through which most of spam emails are routed.
By all ISPs taking initiatives on blocking the port 25, we can confine the spread of unintended virus and a number of spam emails before routed into serve

IP53B (Inbound Port 53 Blocking)

In order to prevent servers or routing devices to be targeted for any fraudulent use, Asahi Net takes a proactive measures called IP53B (Inbound Port 53 Blocking).

Security Blog

Go to Kaspersky's blog for the latest security updates.

Kaspersky.com Blog (only in Japanese)

Useful Security Links

You can find useful information in the following links.

• Guide for First-Time Information Security Countermeasures (IPA)
• Online Safety Basics (National Cybersecurity Alliance)
• Ministry of Internal Affairs and Communications: Information Security Website (only in Japanese)
• Trend Micro (Threat Encyclopedia)
• Kaspersky Official Blog(only in Japanese)
• Top 15 internet safety rules and what not to do online (Kaspersky)
• Email Virus Check Service - Monthly Report