Resolve DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA, CAA) using various public resolvers or custom DNS servers

Perform reverse DNS lookups (PTR records) for IPv4 and IPv6 addresses with automatic zone formatting

Check DNS record propagation across multiple public resolvers (Cloudflare, Google, Quad9, OpenDNS)

Analyze SPF records with recursive expansion of includes/redirects and DNS lookup limit tracking

Analyze DMARC policies, check alignment settings, and identify configuration issues

Walk domain label chain to find effective CAA policies for certificate authority authorization

Verify nameserver resolution and analyze SOA record parameters for DNS configuration health

Query DNS records via DoH and report if the AD (Authenticated Data) bit is set for DNSSEC validation

Analyze Start of Authority records to interpret serial number formats and examine DNS zone timing parameters

Analyze HTTP headers and response metadata with custom method and header support

Follow HTTP redirects and trace the full chain with security upgrade detection

Analyze security headers (HSTS, CSP, X-Frame-Options) with grading and recommendations

Test CORS policies with preflight requests and origin validation

Measure HTTP performance timing including DNS, TCP, TLS, and TTFB metrics

Analyze TLS certificates, view certificate chains, check expiration dates, and examine Subject Alternative Names

Test which TLS protocol versions a server supports and assess overall security posture

Test Application-Layer Protocol Negotiation to see which protocol a server selects (HTTP/2, HTTP/3)

Test TCP connectivity to host:port combinations and measure connection latency

Measure HTTP/HTTPS response latency with statistical analysis (median, p95) without raw ICMP

Check mail server (MX) health including DNS resolution and SMTP port connectivity testing

Analyze SPF records with email deliverability focus and authentication policy evaluation

Check DMARC policies with email deliverability impact analysis and configuration recommendations

Query domain registration data using RDAP through IANA bootstrap registry with structured JSON responses

Look up IP address allocation and registration data using RDAP through Regional Internet Registries

Query Autonomous System Number allocation and registration data using RDAP through RIR services