Fast domain availability checker. Check thousands of domains per second across 1,080+ TLDs.
git clone https://github.com/dotchk/dotchk.git
cd dotchk
./install.shOr manually:
cargo install --path .dotchk example.com
dotchk example.com test.io startup.dev
dotchk pattern "[a-z]{3}.com" --limit 100
dotchk tld mybrand --popular --available-onlyCheck one or more domains:
# Single domain
dotchk example.com
# Multiple domains
dotchk example.com mysite.io startup.dev brand.com
# With custom timeout
dotchk example.com --timeout 5000
# Export results
dotchk example.com test.io --output results.csvGenerate and check domains matching regex patterns. Shows only available domains for easier discovery.
# 3-letter .com domains
dotchk pattern "[a-z]{3}.com" --limit 100
# 4-letter .io domains
dotchk pattern "[a-z]{4}.io" --limit 50
# Short numeric domains
dotchk pattern "[a-z]{2,3}[0-9]{1,2}.com" --limit 100
# Tech startup names (get + word)
dotchk pattern "get[a-z]{4,6}.com" --limit 50
# App names with numbers
dotchk pattern "app[0-9]{2,3}.io" --limit 100
# AI-related domains
dotchk pattern "(ai|ml|gpt|llm)[a-z]{3,5}.ai" --limit 50
# Multiple prefixes
dotchk pattern "(get|try|use|my)[a-z]{4,8}.com" --limit 100
# Multiple prefixes and TLDs
dotchk pattern "(get|try|use)awesome.(com|io|app|dev)"
# With statistics
dotchk pattern "[a-z]{3}.io" --limit 50 --stats
# Export results
dotchk pattern "[a-z]{3,4}.ai" --limit 100 --output ai-domains.csvPattern Syntax:
[a-z]- any letter (a-z)[0-9]- any digit (0-9){3}- exactly 3 of preceding{2,4}- between 2 and 4 of preceding(get|try)- one of these options (alternation)
Pattern Examples:
[a-z]{3}→ abc, xyz, foo[a-z]{2,4}→ ab, abc, abcd[0-9]{3}→ 123, 456, 789app[0-9]{2}→ app01, app99(ai|ml)lab→ ailab, mllabget[a-z]{4}.(com|io)→ getfood.com, getfood.io
Check your brand name across different domain extensions:
# Popular TLDs (com, net, org, io, dev, app, co, me, ai, xyz, info, biz)
dotchk tld mybrand --popular
# Show only available
dotchk tld mybrand --popular --available-only
# Tech TLDs (io, dev, app, tech, cloud, ai, digital, etc.)
dotchk tld mybrand --tech
# Business TLDs (com, biz, business, company, corp, inc, etc.)
dotchk tld mybrand --business
# Creative TLDs (design, studio, art, media, etc.)
dotchk tld mybrand --creative
# Retail TLDs (shop, store, buy, market, etc.)
dotchk tld mybrand --retail
# Country codes (us, uk, de, fr, ca, au, jp, etc.)
dotchk tld mybrand --country
# Combine multiple groups
dotchk tld mybrand --tech --business
# Combine with available-only filter
dotchk tld mybrand --tech --business --available-only
# All 1,080+ public TLDs (takes longer)
dotchk tld mybrand --all
# With statistics
dotchk tld mybrand --tech --stats
# Specific TLDs only
dotchk tld startup --tlds com,io,dev,app,ai
# Export results
dotchk tld mybrand --popular --output brand-check.csvTLD Groups:
--popular- 12 most common (com, net, org, io, dev, app, co, me, ai, xyz, info, biz)--tech- 20 technology-related--business- 20 business-related--creative- 16 creative industry--retail- 15 e-commerce/retail--country- 42 popular country codes--all- 1,080+ public TLDs
Check many domains from a file:
# Check all domains in file
dotchk bulk domains.txt
# Show only available
dotchk bulk domains.txt --available-only
# With statistics
dotchk bulk domains.txt --stats
# Export to CSV
dotchk bulk domains.txt --output results.csv
# Export with stats
dotchk bulk domains.txt --output results.csv --stats
# Increase parallelism for large lists
dotchk bulk domains.txt --parallel 500
# Increase timeout for slow TLDs
dotchk bulk domains.txt --timeout 5000File format (one domain per line, # for comments):
example.com
mysite.io
startup.dev
# This is a comment
brand.com
techstartup.ai
--parallel N- Concurrent checks (default: 100, max: 1000)--timeout MS- Query timeout (default: 3000ms)--available-only- Show only available--output FILE- Export to CSV--stats- Summary statistics--limit N- Max domains to generate (pattern)--tlds LIST- Comma-separated list (tld)
Finding startup domain:
dotchk myawesomestartup.com
dotchk tld myawesomestartup --popular --available-only
dotchk pattern "(get|try|use)awesome.(com|io|app)"Brand protection:
dotchk tld yourbrand --all --output brand-report.csvDomain investment:
dotchk pattern "[a-z]{3}.io" --limit 100 --statsChecks NS records for speed. False positives occur when domains are registered but have no nameservers configured.
Use for discovery and bulk scanning. Always verify with WHOIS before purchasing.
- Fork the repository
- Create feature branch
- Make changes
- Run
cargo test - Submit pull request