domain-availabilitylisted

# Domain Availability Check domain registration status across TLDs with a bundled, dependency-free script. Run it, read the buckets, recommend from AVAILABLE. ## Run From this skill's directory: ```bash python3 scripts/check_domains.py <name-or-domain> [options] ``` - `acme` — check the name across the popular TLD set (.com/.io/.ai/.dev/…) - `acme.com` — check that exact domain, plus the popular set - `--all` — fan out across ~90 TLDs (popular + country + new) - `--tlds com,io,ai,dev` — check exactly these - `--json` — machine-readable output (buckets + per-domain signals) - `--timeout 8` · `--concurrency 10` — tuning ## How it decides (signal hierarchy) 1. **DNS NS-delegation** (`dig NS`) — registered domains are delegated, so NS records in the parent zone ⇒ **taken**. Ground truth, no rate limits. 2. **RDAP** (`https://rdap.org/domain/<d>`) — whois's ICANN-mandated JSON successor. HTTP 200 ⇒ registered, 404 ⇒ available. Authoritative where the registry supports it. 3. **whois** — fallback only when RDAP is inconclusive (429 / timeout / TLD without RDAP), guarded against IANA non-answers. Status per domain: - **available** — not delegated AND (RDAP 404 or whois "no match") - **taken** — NS delegated OR RDAP 200 OR whois shows registration data - **unknown** — everything inconclusive; the `[ns:…, rdap:…]` tag shows why Why not just whois: WHOIS is being retired under ICANN's RDAP transition, and macOS `whois` doesn't reliably follow registry referrals for new gTLDs —