Most RDAP tools return raw registry data and stop there. PhDAPI's advanced domain search adds website previews, domain age, and automatic WHOIS fallback so you never hit a dead end.
Try the advanced domain search →RDAP is the modern standard for querying domain registration data. But most tools built around it have two significant limitations.
Not every domain registry has moved to RDAP yet. When a registry does not support it, most tools return an error or an empty result. You hit a wall with no fallback.
Registration date, registrar, nameservers. Useful, but you still have no idea what the domain is actually used for. You have to visit the site yourself to find out.
PhDAPI queries RDAP first. If the registry has not yet migrated, it automatically falls back to WHOIS. You always get registration data, regardless of which protocol the registry supports.
PhDAPI extracts the most relevant content from a domain's landing page, giving you a snapshot of what the site is about without having to visit it. Useful for quickly scanning unknown domains or evaluating competitors.
See exactly when a domain was registered, how long it has been active, and when it expires. A fast, objective signal for trust assessment, competitive research, and due diligence.
Query domain registration data programmatically or manually, with the confidence that RDAP failures are handled automatically.
Look up a competitor's domain to see when they launched, what their site is about, and how long they have been operating, all in a single search.
Quickly assess newly registered or suspicious domains. Registration date and website content together tell a more complete story than either alone.
Evaluate expiring or available domains faster. See the domain age and what the site was used for without opening multiple tabs.
Registration data, website preview, and domain age in one lookup.
Search a domain nowRDAP (Registration Data Access Protocol) is the modern replacement for WHOIS, introduced by ICANN to standardize how domain registration data is queried and returned. Unlike WHOIS, which returns unstructured plain text, RDAP returns structured JSON, making it significantly easier to parse programmatically.
RDAP also supports better access controls, internationalized domain names, and more consistent data formatting across registries. Most major registries now support RDAP, though some have not yet completed the migration. For those registries, WHOIS remains the only available protocol.
If you are looking for an RDAP lookup tool that handles both protocols transparently, PhDAPI's domain search does exactly that.
