.co.jp TLD audit hub
Japanese commercial second-level domain — restricted to Japanese-incorporated companies.
The .co.jp namespace is the commercial second-level zone under .jp, administered by JPRS. Eligibility is strictly restricted: only one .co.jp domain is permitted per Japanese-incorporated company, verified against the corporate registry. There are no exceptions for individuals, foreign entities, or Japanese branches of foreign companies. As a result, .co.jp is widely treated as a Japanese-corporate-identity signal and adoption among large Japanese companies is essentially universal. DNSSEC is supported. SEO treats .co.jp as a strong Japan-bound geotargeting signal. Email deliverability is on parity with major gTLDs and large Japanese ISPs (NTT Docomo, AU/KDDI) generally extend favourable reputation to verified .co.jp senders. We pay particular attention to language-specific accessibility issues (vertical writing modes, ruby annotations) when auditing .co.jp sites because Japanese-typography fidelity is often a brand priority that gets compromised under Western-defaults frontends.