Simple Domain
Simple Domain is a domain registrar based in Japan. It is ICANN-accredited, with IANA ID 4328.
| Website | simple-domain.jp |
|---|
API access
| Status | Not reviewed |
|---|
API access for Simple Domain has not been checked yet.
About Simple Domain
| Headquarters | Japan |
|---|---|
| Type | Retail registrar |
| ICANN accreditation | IANA ID 4328 |
| Site languages | Japanese |
| RDAP server | https://rdap.simple-domain.jp/rdap/ |
Domain extensions Simple Domain sells
Confirmed on its site: .jp.
Simple Domain in Lemon Domains
Bring Simple Domain domains into Lemon Domains by pasting the domain list or uploading a CSV export, next to the domains from every other registrar you use. Lemon Domains tracks expiry dates and lets your AI assistant answer questions about them through MCP.
Other registrars in Japan
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Sources: the ICANN list of accredited registrars and the IANA registrar ID registry (refreshed 2026-10-24), and Simple Domain's own site and documentation (reviewed 2026-10-24). This page is also available as Markdown and JSON. Something out of date? Tell us.
Frequently asked questions
Is Simple Domain ICANN-accredited?
Yes. Simple Domain is on the ICANN list of accredited registrars, so it can register generic extensions such as .com directly with the registries.
What is Simple Domain's IANA ID?
4328. The IANA registrar ID appears in the registrar field of a domain's public record, so it shows which registrar a domain is with.
What other names does Simple Domain operate under?
Its accreditations are also held as Copernicus, Inc.. Domains registered through any of them can show those names as the registrar.