Chrome //
Extensions 
Chrome
Web store Download Domain Availability Checker and Whois Lookup chrome extension. This plugin checks a domains availability straight from your toolbar. Perfect for web designers/developers. and install in your Google chrome browser. This is Direct Domain Availability Checker and Whois Lookup Crx download for Chrome it is also called Domain Availability Checker and Whois Lookup offline CRX for chrome Download. This Domain Availability Checker and Whois Lookup is used to This plugin checks a domains availability straight from your toolbar. Perfect for web designers/developers.
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Whois Extention By 7Hosty
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SEO and Domain Analysis Tool by DNS Checker. Provides SEO Report, Meta Redirects and 404s, Client IP, Domain IP & Geo Location, etc
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The official mrdeleted.com Whois Lookup. Can search avalailability at various domain registrars if it is no whois is showing.
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Check the availability of any domain
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Do a WHOIS lookup across more than 40 domain extensions.
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Click to get URL's Whois data
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Domain age checker is a whois tool / extension developed by toolpyramid.com for checking any domain age
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Chrome Extension for Web Hosting Support Staffs, Cloud and System Administrators. ( by ServerHealers )
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Whois domain lookup service
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An actual WhoIs Extension...not just a bookmarklet like all the others.