isthiswebsiteavailable.com
Free domain availability checker
isthiswebsiteavailable.com lets you check whether a domain name is available and compare what it costs to register across the major registrars — all in one place, instantly.
Availability is checked using RDAP (Registration Data Access Protocol), the modern standard that replaced WHOIS. The tool queries the authoritative registry for each TLD directly rather than scraping registrar websites. For TLDs without RDAP coverage — including .io, .ai, .gg, .tv, .fm, .sh, .to, .so, .vc, and .ly — it falls back to a direct WHOIS query over TCP so those extensions are fully supported too.
Prices are fetched live where APIs are available. Cloudflare, Dynadot, NameSilo, and Name.com prices are pulled in real time on every search. For registrars without accessible APIs, the tool shows clearly labeled estimates based on current published pricing.
The site runs on Cloudflare Workers at the edge, so searches are handled close to you with minimal latency. No account required, no search history stored on our servers — recent searches are saved locally in your browser only.
What it does
Domain availability
RDAP for hundreds of TLDs + WHOIS fallback for .io, .ai, .gg, .tv, .fm, .sh, .to, .so, .vc, .ly
Registrar prices
Live or estimated, sorted cheapest first with registration and renewal costs side by side
Same name, other extensions
Parallel checks across 17 TLDs so you can see alternatives in seconds
Domain quality grade
Scores length, pronounceability, and TLD tier to help you pick a strong name
Social handle check
Instagram, X, and YouTube username availability in one go
Name alternatives
Suggests get-, try-, use-, my-, go- prefixes and -hq, -app, -hub suffixes for taken names
Marketplace links
Taken domain? One-click links to Afternic, Sedo, and Dan.com to check if it's for sale
Bulk domain check
Check up to 20 domains at once
TLD price comparison
Browse and compare registration and renewal costs across extensions on the TLD Prices page
Public API
Availability and price data available via a documented REST API
Built by
Rishav Mukherjee
Software Engineer · Bay Area, California
I am a software engineer based in the Bay Area, California, with a focus on AI pipelines, developer tools, and cloud deployment. I build systems that connect large language models to real-world workflows, from data ingestion and preprocessing through to model serving and output integration.
I care about tools that are genuinely useful: fast, clear, and honest about what they do and do not know. isthiswebsiteavailable.com is an example of that, a straightforward utility that gives you accurate information without friction.