Discover
Start with registered UK domains and normalise them into a deduplicated, continuously managed scan queue.
Built to process millions of domains in controlled batches.
How Yellow Index works
From a domain name to a reason to talk.
Yellow Index combines broad UK domain coverage with selective website scanning and enrichment. The result is a living opportunity index, not a one-off spreadsheet that starts ageing the moment it is downloaded.
Pipeline
Domain → Website
Website → Signals
Signals → Company
Company → Opportunity
A staged intelligence pipeline.
Cheap qualification happens first. Deeper crawling, company matching and paid enrichment are reserved for reachable domains with useful commercial signals. That keeps a nine-million-domain universe operationally and economically realistic.
Observe
Fetch public website and DNS signals to identify technologies, infrastructure, contact routes and technical conditions.
Evidence is retained so detections can be inspected, not merely trusted.
Enrich
Connect domains to company identities and improve public contact information with source and freshness metadata.
UK company resolution and contact verification are staged by lead value.
Prioritise
Combine fit, opportunity, contactability and confidence into searchable lead intelligence with clear reasons.
Users can filter the evidence rather than buying an opaque static list.
Explainable by design
See why a lead is ranked.
Technology evidence
Asset paths, metadata, headers, DNS and public endpoint observations support technology detections.
Opportunity evidence
Security, SEO and legacy-platform findings point to concrete reasons a company may need help.
Contact provenance
Public contact routes retain their source and freshness rather than appearing as context-free personal data.
Scoring reasons
Lead quality is presented with human-readable factors instead of a mysterious number alone.
Yellow Index early access