Instant Domain Availability
Sub-millisecond results across 800+ extensions with live DNS probing, domain hacks, and registrar comparison.
Sub-Millisecond Engine
Reverse-engineered from ICANN CZDS principles. Streams availability in real time via NDJSON and local zone index with zero rate-limit throttle.
Intelligent Domain Hacks
Automatically breaks words across 800+ extensions like start.up and portfol.io as you type.
Authoritative RDAP & DNS
Queries direct authoritative TLD nameservers (RFC 7480) for 100% verified status, avoiding cached registrar false-positives.
Popular Domain Extensions
Standard wholesale & retail price estimates across major accredited registrars
Commercial & global standard
Network & internet infrastructure
Organizations & communities
Company & modern startups
Artificial Intelligence & modern tech
Input/Output & developer tools
Developers & engineering teams
Web & mobile applications
Technology brands & platforms
Cloud computing & SaaS
Digital products & media
Small business & commerce
Agencies & creative studios
E-commerce & retail shops
Sub-Millisecond Query Benchmarks
Fastest anycast latency with DNS-over-HTTPS fallback.
Global redundancy & authoritative root cache coverage.
Threat intelligence filtering & strict zero-logging privacy.
Domain Name Search FAQs
Everything you need to know about sub-millisecond availability checking, registrar pricing, and domain acquisition.
DomainChecker.app bypasses conventional web scraping and sluggish registrar checkout pages. Instead, our backend queries authoritative TLD root nameservers directly using concurrent asynchronous UDP/TCP DNS probing and ICANN Centralized Zone Data Service (CZDS) diff streams. Responses are decoded on the fly using NDJSON (Newline Delimited JSON) streams directly into your browser within 15–80ms.