RDAP · WHOIS · DNS
whois
Who owns a domain, an IP address or a network. The registrar, when it was registered and when it expires, its nameservers and DNS, and the raw record, straight from the registries.
Your recent lookups
Domains
Registrar, age, expiry
Status codes in plain words, nameservers, DNSSEC, and live A, MX, TXT, CAA records.
IPs & networks
Owner, range, abuse contact
IPv4, IPv6 and ranges: the network, its country, reverse DNS and who to report abuse to.
Straight from the source
RDAP first, then port 43
Asks the registries themselves, as IANA directs. Add any query to the address: /github.com