Domain Name Brainstorming: Check 500 Domains at Once

Who actually checks 500 domains at once

Five real user types we've seen:

• Naming agencies. Presenting a client with 20 shortlisted names requires brainstorming 300+ to filter down. Efficiency matters because agency fees are time-bound.
• Domain investors. Hunting for dropped domains or undervalued aftermarket names across specific pattern rules (three-letter domains, word pairs, TLD sets) - often means checking hundreds per session.
• Founders deep in brainstorm. A determined founder with a list of word roots, prefixes, and suffixes can generate 500 candidates in an afternoon.
• SEO consultants. Checking a client's competitive landscape often involves auditing which brand-adjacent domains are taken vs free, across many TLDs.
• M&A researchers. Checking whether a target company's brand variations and typos are all owned by them (and if not, whether they should be bought defensively).

All five need to check 100-1000+ domains in a single working session. Doing this through a registrar's single-box search is a non-starter - the friction kills the workflow before the research starts.

Why most tools cap out at 50-100

Domain availability checks rely on DNS queries and WHOIS lookups. Public WHOIS servers and DNS resolvers enforce rate limits to prevent abuse - a bulk tool that sends 1000 queries in one second to the same server will get blocked. Responsible tools pace their queries, cache results, and parallelize carefully.

Consumer bulk tools often cap at 50-100 domains per batch because that's a safe size that doesn't trigger rate limits from any source. Going to 500+ requires more careful query management: parallel queries but with small delays between batches, retry on soft-failures, and clear error reporting when a specific domain can't be checked reliably.

Strategy 1: Chrome extension with smart batching

Bulk Domain Checker Pro handles batches of 500 by breaking them into smaller parallel groups internally. From the user perspective, you paste 500 domains and get results. Under the hood, the extension pages the queries to stay under rate limits while finishing the full list in 30-60 seconds.

Workflow:

1. Install the extension from the Chrome Web Store.
2. Open the popup, click Bulk Check.
3. Paste your list (one domain per line or comma-separated).
4. Pick TLDs if you're checking name roots across multiple TLDs; pick "as-entered" if you've already specified TLDs in your list.
5. Click Check. Wait.
6. Export CSV for downstream filtering in Excel or Google Sheets.

No account, no limit timer, no upsell while results load. Uses your browser's storage, not our servers, so your list stays private.

Strategy 2: Registrar bulk tools

Registrars like Namecheap (Beast Mode), GoDaddy (Bulk Domain Search), and Dynadot have bulk search tools that work for batches up to 500 or so. The tradeoff: you need an account, and the tool is designed to funnel you into registration with that registrar at their prices.

Good use case: when you already have a registrar relationship and you're ready to buy.

Bad use case: pure research, especially if you buy at different registrars depending on TLD price. A registrar's bulk tool will show you Namecheap prices for all results, not the best price across all registrars.

Strategy 3: Command-line / API (for developers)

For developers with API access, using a WHOIS API or RDAP endpoint directly is the most flexible approach. You can check 10,000 domains in a script, filter programmatically, and integrate with other data pipelines.

Downsides: you need API credentials (often paid), and you have to handle rate limiting, retries, and output formatting yourself. For anything under 1000 domains, the setup time exceeds the runtime savings.

Generating a 500-domain list efficiently

Actually creating a list of 500 candidates takes more time than checking them. A few techniques:

Pattern combination

Start with 20 root words and 5 prefixes/suffixes. 20 x 5 = 100 candidates. Then do the same with a different set of prefixes. 500 candidates from a small word list in under an hour.

Example - fintech startup:

• Roots: cash, coin, pay, vault, ledger, mint, peso, paisa, ruble, rand, yen, bit, byte, wave, flow, pulse, tide, stream, drift, ripple
• Prefixes: go, get, try, use, hey, hi, my, io
• Combine all: 20 * 8 = 160 candidates.

Add suffixes: "ly", "io", "x", "hq", "app" - another 100 candidates. Quickly you're at 500.

AI-assisted generation

Modern LLMs are good at generating name candidates given constraints. "Give me 100 short, made-up names for a fintech startup, maximum 8 characters, pronounceable in English" produces usable lists. Feed the output directly into a bulk checker.

Dictionary mining

For niche domains (food, travel, health), pulling relevant words from a specialty glossary gives you 500+ candidates with real meaning. Cooking terms glossary, for example, yields dozens of short, evocative words that might not be taken on short TLDs.

Exporting and filtering

500 checks produces a lot of results. Plan your filtering:

1. Export to CSV. Most bulk tools support this. Bulk Domain Checker Pro does.
2. Open in Google Sheets or Excel. Filter to "available" only. Sort by character count ascending.
3. Flag trademark risk. For your top 10, Google each one + industry. Eliminate if a direct competitor exists.
4. Quick Google meaning check. Search for each name alone - eliminate if there's a negative meaning in another language or a prominent unrelated brand that'll muddle search visibility.
5. Shortlist to 5. Present to stakeholder.

Common pitfalls at scale

Soft failures mistaken for available. If a WHOIS server times out, a lazy tool reports "available" by default. A good tool reports "check failed - retry" so you don't mistake an error for an available domain. Always re-check your top picks individually at a registrar before registering.

Stale caching. Domains dropped in the last 24 hours may still show as registered in cached WHOIS data. Conversely, domains registered very recently may still show as available. Always verify the exact domain you're about to register via the registrar's live search.

Internationalized domain names (IDN). Domains with non-ASCII characters have separate check logic and rate limits. Most bulk tools don't handle them well - if you need IDN availability, use a specialized tool.

Related reading

• Domain Name Brainstorming
• Find Available Domain Names for a Startup in Under 10 Minutes
• How to Check Domain Availability in Bulk
• Bulk Domain Lookup With WHOIS