.co.uk TLD audit hub
United Kingdom commercial second level — the dominant TLD for British businesses.
The .co.uk namespace is the commercial second-level zone under the UK ccTLD, administered by Nominet. It has roughly 8 million active registrations, making it one of the largest namespaces globally. There is no residency requirement and registration is open to global entities, which has helped it achieve broader adoption than .uk would have alone. Nominet runs a respected dispute-resolution service (DRS) and an active registry-lock program; DNSSEC is supported. Most established UK commercial brands use .co.uk as their primary domain. SEO treats .co.uk as a strong UK geotargeting signal, equivalent to direct .uk. Email deliverability is on parity with major gTLDs; UK ISPs (BT, Virgin Media, Sky) participate in the standard reputation ecosystem. We pay attention to canonicalization between .co.uk and .uk on UK brands that own both, since duplicate content is a common audit finding when the consolidation work was never completed.