DNS, WHOIS, IPv4/IPv6, ASN, IP geolocation, DNS propagation, blacklist (RBL), and DNSSEC checks for a domain or IP address.

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Notes: WHOIS needs outbound TCP/43 open on your server. Geolocation, DNS Propagation, and DNSSEC checks call third-party HTTPS APIs (ipwho.is, Google/Cloudflare/Quad9/AdGuard DoH) — availability and rate limits depend on those services. RBL and ASN lookups currently support IPv4 targets (ASN also supports IPv6).