Block a user
Diff mode: highlight resolvers that disagree with the majority
Parallel queries across all resolvers
Query A, AAAA, CNAME, MX, TXT, NS, SOA record types
GitLab CI: build + release binaries on tag
Cross-compile Makefile targets
Report renderer (color terminal + JSON)
HTTP header fetch + CDN header detection
CDN CIDR list (embed JSON, update via Makefile)
ASN lookup (HTTP call to free API, cache result)
Project scaffold (go mod init, cmd/, internal/)
--watch flag: re-check every N seconds (useful during DNS migration)
Output: --json flag for scripting
Output: clean terminal report (color-coded pass/fail)
HTTP header inspection (CF-Ray, X-Served-By, Via, Server, X-Cache)
Detect known CDN/cloud CIDR ranges (Cloudflare, Fastly, AWS, GCP, Azure)
ASN / org lookup via ip-api.com or ipinfo.io (self-hosted fallback)
Reverse DNS lookup (PTR record)