domain-searchlisted

# Domain Search Brainstorm brandable names and check which domains are actually available to register. ## How availability is checked: RDAP (not WHOIS, not a paid API) Availability is determined with **RDAP** — the official IETF successor to WHOIS (RFC 9082/9083). Query `https://rdap.org/domain/<fqdn>`, which routes to the responsible registry and returns: - **HTTP 404 → AVAILABLE** (no registration record exists) - **HTTP 200 → TAKEN** (a registration record exists) - **anything else → UNKNOWN** (TLD has no RDAP server) rdap.org throttles bursts, so the script retries `429`/`5xx`/network failures up to 3× with backoff and pauses ~0.2s between domains (`RDAP_THROTTLE` env var). Without that, transient rate-limiting shows up as `UNKNOWN` and quietly hides real answers in a large batch. This is authoritative and free. It is more reliable than scraping Instant Domain Search / GoDaddy, whose public endpoints change and rate-limit. RDAP tells you *registered or not*; it does **not** price premium/reserved names — confirm the final price at a registrar. ### Caveats (state these when relevant) - **Not all TLDs publish RDAP.** `.io` historically had no RDAP, and some ccTLDs still don't. `UNKNOWN` means "couldn't determine" — never report it as available. - `.com`, `.ai`, `.net`, `.org`, `.app`, `.dev`, `.co` work well via RDAP. - An RDAP-available name can still be a **premium** listing (high price). Verify at checkout. ## The script `scripts/check-domains.sh` — batch chec