# Jun'ichirō Hagino

> Japanese computer scientist and programmer (1970-2007)

**Wikidata**: [Q11620452](https://www.wikidata.org/wiki/Q11620452)  
**Source**: https://4ort.xyz/entity/jun-ichiro-hagino

## Summary
Jun'ichirō Hagino (1970-2007) was a Japanese computer scientist and programmer. He is best known as a core developer of the KAME project, which created a widely used, open-source implementation of the IPv6 and IPsec protocols for BSD-based operating systems.

## Biography
- **Born**: 1970-10-02
- **Nationality**: Japan
- **Education**: Keio University
- **Known for**: Developing the KAME project's IPv6 and IPsec stack.
- **Field(s)**: Computer science, programming

## Contributions
Jun'ichirō Hagino was a key figure in the development and implementation of next-generation internet protocols. His most significant contribution was his work on the KAME project, which began in 1998. As a lead developer, Hagino helped create a high-quality, production-ready, and freely available protocol stack for IPv6 and IPsec.

The KAME project's software was specifically developed for BSD (Berkeley Software Distribution) derivative operating systems. This work provided a crucial, standardized reference implementation that was widely adopted by major open-source projects. By providing this foundational code, Hagino and the KAME team enabled the broader technical community to test, deploy, and integrate IPv6 and IPsec, accelerating the internet's transition to more modern and secure protocols. He was widely known in the development community by his alias, "Itojun".

## FAQs
### Q: What was Jun'ichirō Hagino known for?
A: Jun'ichirō Hagino was a Japanese computer scientist best known for his foundational work on the KAME project. This project created a key open-source implementation of the IPv6 and IPsec internet protocols for BSD-derived operating systems.

### Q: What is the KAME project?
A: The KAME project, which started in 1998, was a collaborative effort to develop a free and robust protocol stack for IPv6 and IPsec. Its code became a reference implementation and was integrated into many operating systems, playing a vital role in the early adoption of IPv6.

### Q: What was Jun'ichirō Hagino's alias?
A: In the technical and open-source communities, he was widely known by the alias "Itojun".

## Why They Matter
Jun'ichirō Hagino's work was fundamental to the practical implementation and adoption of IPv6, the protocol designed to succeed IPv4 and sustain the internet's growth. By co-developing the KAME project's IPv6 and IPsec stack, he provided a stable, open-source, and thoroughly vetted codebase that operating system developers could rely on.

This contribution was critical because it lowered the barrier to entry for adopting IPv6. Instead of each project building its own implementation from scratch, the BSD community and others could integrate the KAME stack, ensuring a higher degree of interoperability and security. Without Hagino's focused efforts, the deployment of IPv6 would have been significantly slower and more fragmented, delaying the progress of the modern internet infrastructure. His work provided one of the essential building blocks for the internet of today.

## Notable For
*   A core developer of the **KAME project**, which produced a reference implementation of the IPv6 and IPsec protocol stacks.
*   Pioneering the implementation of IPv6 for BSD-derivative operating systems, which influenced many other systems.
*   Being a prominent figure in the open-source and internet engineering communities, widely known by the alias **Itojun**.

## Body
### Personal Details
*   **Full Name**: Jun'ichirō Hagino (萩野純一郎)
*   **Date of Birth**: October 2, 1970
*   **Date of Death**: October 29, 2007
*   **Nationality**: Japanese
*   **Education**: Attended Keio University.
*   **Family**: He had a sibling named Shōjirō Itō.

### Professional Work
*   **Occupations**: Computer scientist, programmer, software engineer.
*   **Primary Focus**: Hagino's work centered on the implementation of core internet protocols, particularly IPv6 and the security protocol IPsec.

### The KAME Project
Jun'ichirō Hagino was a central figure in the KAME project, a collaborative effort to create a free, open-source implementation of next-generation internet protocols.
*   **Inception**: The project began in 1998.
*   **Technology**: It produced a protocol stack for IPv6 and IPsec.
*   **Impact**: The KAME stack was designed for and widely adopted by BSD-derivative operating systems, serving as a stable and reliable foundation for their networking capabilities.

### Aliases and Identifiers
*   **Primary Alias**: He was widely known in technical circles as "Itojun".
*   **Other Aliases**: Jun'ichiro Hagino, Jun'ichirou Hagino, 伊藤純一郎, Хагино, Дзюнъитиро.
*   **Name in Kana**: はぎの じゅんいちろう
*   **Official Website**: http://www.itojun.org/itojun.html

## References

1. [Web NDL Authorities](https://id.ndl.go.jp/auth/ndlna/00934928)