host.tools

Domain availability

Domain /api/v1/domain/availability

Check if a name is available across 20+ popular TLDs.

Try: mygreatname host checkhost
Label
checkhost
Checked
21
Available
15
Taken
6
checkhost.com
.com
taken
checkhost.net
.net
taken
checkhost.org
.org
free
checkhost.io
.io
taken
checkhost.co
.co
taken
checkhost.app
.app
free
checkhost.dev
.dev
free
checkhost.tools
.tools
free
checkhost.ai
.ai
free
checkhost.xyz
.xyz
taken
checkhost.info
.info
free
checkhost.de
.de
taken
checkhost.uk
.uk
free
checkhost.eu
.eu
free
checkhost.me
.me
free
checkhost.us
.us
free
checkhost.tech
.tech
free
checkhost.online
.online
free
checkhost.site
.site
free
checkhost.store
.store
free
checkhost.blog
.blog
free
How to use Domain availability
  1. 1
    Paste your input

    Enter the value at the top — domain, IP, URL, email, ASN, hash, whatever fits this tool. The smart input auto-detects type.

  2. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 3
    Open the API tab

    Every web tool has a sibling /api/v1/domain/availability JSON endpoint with the same payload. One copy-as-curl click and you're scripting it.

Why this matters

WHOIS, expiry, DNSSEC, name servers — domain metadata is the single most-overlooked outage source. Lock it down before someone else does.

API equivalent
/api/v1/domain/availability?q=checkhost 
curl -s '/api/v1/domain/availability?q=checkhost'
Embed this tool
<iframe src="/domain/availability?q={INPUT}&embed=1"
  width="100%" height="600" frameborder="0"></iframe>

Drop into any HTML page. The embed=1 flag hides nav and footer.

FAQ · Domain availability

Common questions

Is Domain availability free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/domain/availability is free up to 100 requests/hour, no key required.
Where does the data come from?
Real-time probes against authoritative sources (DNS root, RIRs, registries, the target server itself), plus partner data feeds from hostinfo.com (GeoIP/ASN) and hostcheck.com (reputation).
How fresh are the results?
Live by default. Cached for 5 minutes to make repeat queries instant; pass ?nocache=1 for a forced refresh.
Can I run this from the command line?
Yes — every tool ships with a copy-as-curl. There's also an official CLI: host.tools domain availability YOUR_INPUT.
Can I monitor results over time?
Pro tier lets you schedule any tool to run every 1/5/15/60 min and alert on diff. See monitors.
host.tools Pro

Run Domain availability on a schedule. Get pinged when it changes.

Pro gets you bulk lookups, monitors, webhook alerts, history, exports and 10,000 API calls/day. $19/mo.

See pricing Tour monitors
  • ✓Schedule any tool — every 1, 5, 15, 60 min
  • ✓Diff against last run, alert on change
  • ✓Webhook + email + Slack + PagerDuty + OpsGenie
  • ✓Bulk CSV upload, 1,000 inputs per job
  • ✓Export results as CSV / NDJSON / Excel
  • ✓90-day history, comparison view