RDAP Lookup is a private lookup tool for domain names, IP addresses and Autonomous System Numbers using RDAP, the replacement for Whois. The browser connects directly to the relevant registry's RDAP server over encrypted HTTPS. An optional setting follows the referral to the registrar's RDAP record. The page notes that all generic TLDs support RDAP while only a few ccTLDs have deployed it.
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Who.is is a domain and IP information lookup service. It offers WHOIS and RDAP lookups, DNS records, nameserver lookup, IP address lookup, domain history and uptime checks. Premium offerings include downloadable domain history reports, website monitoring for up to 10 domains and API access providing parsed WHOIS, RDAP, DNS and TLS certificate data as JSON over HTTPS, with a free tier.
digga is a free domain and infrastructure research tool that looks up DNS records, RDAP and WHOIS data, subdomains, IP details and email authentication in one report. It supports many DNS record types and passive subdomain enumeration. The project is open source under AGPL 3.0 with no accounts or paywalls.
Domain Recon Tool is a free online tool for security researchers and analysts that retrieves DNS records, WHOIS and RDAP data, SSL certificates, IP addresses and subdomains for a domain or URL. It supports complete DNS record analysis and WHOIS registration data retrieval.