Root servers explained – The 13 machines that anchor the internet

This is the Japan IGF Support Organization. This English article summarises ルートサーバー for readers who are new to internet governance, with a Japan-aware perspective.

There aren’t really 13 root servers

The 13 root server systems, how they actually run hundreds of machines worldwide, and why the number 13.This topic sits at the intersection of technical operation, policy, and everyday user experience.

The 13 letters A to M

The 13 letters A to M is the first conceptual hurdle when learning about ルートサーバー. The simplest framing is: why does this need to exist? Without it, the internet would split into incompatible islands.

Distributed via Anycast

Distributed via Anycast touches your daily life more directly than you might think. Domain resolution, email delivery, app store rules, content moderation – they all eventually trace back to decisions made in venues like ICANN and IGF.

Japan hosts root server mirrors too

Japan hosts root server mirrors too is governed by a multi-stakeholder structure, with governments, technical community, business, and civil society all having seats. This is different from the UN model, and that difference matters.

What if they all went down

What if they all went down can be observed in:

App features and restrictions
Platform terms of service
Government guidelines
Laws and regulations

Knowing the upstream source makes future changes easier to interpret.

How this affects your phone

If you want to take a first step, the easiest path is to watch the remote feed of an ICANN public meeting or an IGF Day 0 event. Both are free and do not require pre-registration to view passively. You can decide later whether to engage more actively.