Queried via the RDAP endpoints of IANA and the regional registries (ARIN / RIPE / APNIC / LACNIC / AFRINIC). Returns the allocated block, network type (Allocation / Assignment / Legacy), abuse contact, and more.
Look up ASN registration details: network name, operating organization, registration country, start/end ASN range, technical contact, and more.
Look up a domain's registrant, registrar, creation/expiration dates, name servers, abuse contact, and more.