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DNSPerf compares the speed and uptime of enterprise and commercial DNS services. It lists DNS providers sorted by DNSPerf rank based on data for the last 30 days, calculated using 40% performance, 45% uptime and 15% quality.
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.
