NameCheckup
Free web-based username and domain availability checker that searches across 20+ social media platforms and 40+ domain extensions with WHOIS lookup…
Platforms: Web · Last verified September 7, 2026
Free web-based username and domain availability checker that searches across 20+ social media platforms and 40+ domain extensions with WHOIS lookup support.
Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.
Getting started
Best for: Username and domain availability checking with WHOIS info. See the official site linked above for details.