26 commands · tab completes · why mail example.com, or ask in plain words
Click one, or type why mail yourdomain.com. An agent in this page plans its own. No agent here? Open this page in ChatGPT’s browser, Codex or Chrome with WebMCP enabled, or call /mcp from outside one.
resolution
delegation
registration
transport
addressing
reachability
meta
readability
point at one, or type it
- Cloudflare
- 1.1.1.1
- 8.8.8.8
- Quad9
- 9.9.9.9
- OpenDNS
- 208.67.222.222
- AdGuard
- 94.140.14.14
- Control D
- 76.76.2.0
Live domain and network diagnostics. Every answer is a fresh lookup that says how old it is, and the same URLs answer in text for a terminal, JSON for a program and markdown for an agent: curl dug.sh/tls/github.com needs no key. Details at /developers, /llms.txt and /openapi.json.