Looking up…
Only clear answers.
Each platform is asked through its public API, which says plainly whether an account or package exists. Platforms that forbid automated lookups or hide behind bot checks are left out rather than guessed. A name shown as free can still be reserved or banned by the platform; try to register it to be sure.
Accounts and packages.
GitHub, GitLab, Bluesky, Mastodon, Hugging Face, Hacker News and DEV are user names. npm, PyPI and crates.io are package names: what developers type to install your code, worth claiming early for a developer product.
Questions people ask.
How does the username checker work?
It asks each platform's public API whether an account or package with that name exists, and shows free, taken, or unclear when a platform does not answer.
Why not Instagram, X, TikTok or YouTube?
Their terms forbid automated lookups, and their pages answer the same way for free and taken names. Check those in their apps.
Why does it say not allowed for some platforms?
Each platform has its own rules for names: GitHub allows letters, digits and single hyphens up to 39 characters, Hacker News 2 to 15 characters. The result shows the rule it broke.
Should my username match my domain?
It helps people find you, and it protects the brand. Check both at once with the brand name checker.
Hivex index
Short names, still free to register.
Starting something new? Hivex keeps a live index of short, brandable .si names nobody has claimed yet, each checked with the registry.
From code, or an AI assistant.
Hivex's free JSON API and MCP server check domains, DNS and registration records from your own code or from AI assistants that speak MCP. No key needed.
More Domain tools
- Domain availability checkerIs a name free? Live from the registry, on any extension.
- Brand name checkerOne name: 8 domain extensions and 10 platforms.
- Domain name generatorIdeas from your words, each one checked free.
- Typosquatting checkerLookalikes of a domain: registered, taking mail, or free.
- Domain history checkerArchive captures by month, and signs of past owners.
- Is this domain for sale?Marketplace, parking and for-sale signs, and how to buy.
- Transfer date calculatorWhen a domain can move registrars, and what blocks it.
- Punycode converterUnicode to xn-- and back, with lookalike warnings.
- Bulk domain checkerUp to 200 names at once, live, with a CSV.
- WHOIS lookupRegistrar, dates, status locks and name servers, from the registry.
- Domain age checkerExact age from the registration date, plus the last change and transfer.
- Domain expiration checkerExpiry date, days left, and what happens if it lapses.
- Registrar lookupThe registrar, its IANA ID and abuse contact, and the transfer lock.
- Name strength checkerScore a name, and see where its misspellings lead.
- Domain hack generatorWords spelled across the dot, like fami.ly.
- Business name generatorNames for your business, each with a free .com.
- Short domain finder4 and 5 letter names you can still register.
- Dropped .si names.si names that just became free again.
- AI domain name generatorAI name ideas from a description, with a free .com.
- Domain value checkerWhat a name's value rests on, scored and explained.
- TLD lookupWho runs an extension, since when, and how.
- .si price comparisonWhat .si costs at each registrar, over the years.
- Domain prices by extensionFirst year, renewal and 5-year cost of any extension.
- Domain checkerIs a name free to register? Checked live on any extension.
Sources
- GitHub REST API: get a user
- AT Protocol: resolveHandle (Bluesky)
- Mastodon API: account lookup
- Hacker News API
By Hivex. Updated 10 October 2026. Records come live from each domain's own registry (RDAP) and are kept for up to an hour.