https://blog.agentthread.dev/tags/domain/Recent content in Domain on Yarang's Tech LairHugo -- gohugo.ioenMon, 09 Mar 2026 00:20:00 +0900https://blog.agentthread.dev/post/boosting-developer-productivity-introducing-domain-checker-skill/Mon, 09 Mar 2026 00:20:00 +0900https://blog.agentthread.dev/post/boosting-developer-productivity-introducing-domain-checker-skill/<h1 id="boosting-developer-productivity-introducing-domain-checker-skill">Boosting Developer Productivity: Introducing Domain Checker Skill </h1><p>What&rsquo;s the first thing you consider when starting a new project? The &ldquo;domain name,&rdquo; of course.</p> <p>What if your most desired name is already taken in .com or .ai? Have you visited whois sites one by one each time?</p> <p>I did too. So I built a solution.</p> <h2 id="the-problem-repetitive-domain-search-tasks">The Problem: Repetitive Domain Search Tasks </h2><p>If you&rsquo;re a startup founder or developer, you&rsquo;ve likely faced this situation:</p> <ol> <li>Desired domain is already registered</li> <li>Visit 10 different whois sites</li> <li>Manually create comparison table in Excel</li> <li>Brainstorm alternative domain names</li> </ol> <p>This process wastes time and drains creativity through repetitive work.</p> <h2 id="the-solution-domain-checker-skill">The Solution: Domain Checker Skill </h2><p><strong>Domain Checker</strong> is a skill for Claude Code that checks domain availability in real-time and compares costs.</p> <h3 id="key-features">Key Features </h3><table> <thead> <tr> <th>Feature</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><strong>Fast Parallel Lookup</strong></td> <td>Check 8 major TLDs simultaneously</td> </tr> <tr> <td><strong>3-Stage Fallback</strong></td> <td>RDAP → whois → DNS (ensures reliability)</td> </tr> <tr> <td><strong>Automatic Alternative Suggestion</strong></td> <td>Auto-discovers alternatives when all desired domains are taken</td> </tr> <tr> <td><strong>Cost Comparison Table</strong></td> <td>Shows annual cost and minimum contract period by TLD</td> </tr> <tr> <td><strong>Markdown Report</strong></td> <td>Automatically generates detailed result reports</td> </tr> </tbody> </table> <h3 id="usage">Usage </h3><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e"># Basic lookup</span> </span></span><span style="display:flex;"><span>/domain-checker myapp </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#75715e"># Result example</span> </span></span><span style="display:flex;"><span>🔍 Domain Search: myapp* </span></span><span style="display:flex;"><span> 🔴 myapp.com <span style="color:#f92672">(</span>~$13/year<span style="color:#f92672">)</span> </span></span><span style="display:flex;"><span> 🔴 myapp.ai <span style="color:#f92672">(</span>~$75/year<span style="color:#f92672">)</span> </span></span><span style="display:flex;"><span> 🟢 myapp.io <span style="color:#f92672">(</span>~$38/year<span style="color:#f92672">)</span> ← Available! </span></span></code></pre></div><h3 id="target-tlds">Target TLDs </h3><table> <thead> <tr> <th>TLD</th> <th>Annual Cost</th> <th>Min Contract</th> <th>Characteristics</th> </tr> </thead> <tbody> <tr> <td>.com</td> <td>~$13</td> <td>1 year</td> <td>General, highest recognition</td> </tr> <tr> <td>.ai</td> <td>~$75</td> <td><strong>2 years</strong></td> <td>AI project specialized</td> </tr> <tr> <td>.io</td> <td>~$38</td> <td>1 year</td> <td>Tech startup preferred</td> </tr> <tr> <td>.net</td> <td>~$14</td> <td>1 year</td> <td>.com alternative</td> </tr> <tr> <td>.co</td> <td>~$28</td> <td>1 year</td> <td>Startup popular</td> </tr> <tr> <td>.dev</td> <td>~$13</td> <td>1 year</td> <td>Developer targeted</td> </tr> <tr> <td>.tech</td> <td>~$12</td> <td>1 year</td> <td>Tech-related, low cost</td> </tr> <tr> <td>.app</td> <td>~$14</td> <td>1 year</td> <td>App service specialized</td> </tr> </tbody> </table> <h2 id="technical-details">Technical Details </h2><h3 id="3-stage-fallback-mechanism">3-Stage Fallback Mechanism </h3><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-fallback" data-lang="fallback"><span style="display:flex;"><span>1. RDAP API → Most accurate, fast </span></span><span style="display:flex;"><span>2. whois CLI → Fallback when RDAP fails </span></span><span style="display:flex;"><span>3. DNS NS lookup → Last resort </span></span></code></pre></div><h3 id="alternative-domain-suggestion">Alternative Domain Suggestion </h3><p>When all major domains are registered, automatically discovers alternatives:</p> <p><strong>Search Patterns:</strong></p> <ul> <li>Prefixes: <code>get</code>, <code>try</code>, <code>use</code>, <code>go</code>, <code>my</code>, <code>the</code></li> <li>Suffixes: <code>hq</code>, <code>app</code>, <code>hub</code>, <code>lab</code>, <code>pro</code></li> </ul> <p><strong>Example:</strong> <code>myapp</code> → <code>getmyapp.ai</code>, <code>myapp-hq.io</code>, <code>trymyapp.com</code></p> <h3 id="asynchronous-parallel-processing">Asynchronous Parallel Processing </h3><p>Uses Python async programming to check 8 TLDs simultaneously, delivering results within 2 seconds.</p> <h2 id="real-usage-example">Real Usage Example </h2><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>/domain-checker ai </span></span></code></pre></div><p><strong>Result:</strong></p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-mysql" data-lang="mysql"><span style="display:flex;"><span><span style="color:#75715e"># 🌐 Domain Search Report: `ai` </span></span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#75715e">## Summary </span></span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> Item <span style="color:#f92672">|</span> Result <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span><span style="color:#75715e">------|--------| </span></span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> Search Domain <span style="color:#f92672">|</span> <span style="color:#f92672">`</span>ai<span style="color:#f92672">`</span> <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> TLDs Checked <span style="color:#f92672">|</span> <span style="color:#ae81ff">8</span> <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> <span style="color:#960050;background-color:#1e0010">🟢</span> Available <span style="color:#f92672">|</span> <span style="color:#f92672">**</span><span style="color:#ae81ff">0</span><span style="color:#f92672">**</span> <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> <span style="color:#960050;background-color:#1e0010">🔴</span> Already Registered <span style="color:#f92672">|</span> <span style="color:#ae81ff">8</span> <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#75715e">## 💡 Alternative Domain Name Suggestions </span></span></span><span style="display:flex;"><span>Domains available among variations of <span style="color:#f92672">`</span>ai<span style="color:#f92672">`</span>. </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> Domain <span style="color:#f92672">|</span> Annual Cost <span style="color:#f92672">|</span> Notes <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span><span style="color:#75715e">--------|-------------|-------| </span></span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> <span style="color:#f92672">`</span>ai<span style="color:#f92672">-</span>hq.ai<span style="color:#f92672">`</span> <span style="color:#f92672">|</span> <span style="color:#f92672">~</span><span style="color:#960050;background-color:#1e0010">$</span><span style="color:#ae81ff">75</span><span style="color:#f92672">/</span><span style="color:#66d9ef">year</span> <span style="color:#f92672">|</span> AI <span style="color:#a6e22e">specialized</span> (min <span style="color:#ae81ff">2</span><span style="color:#f92672">-</span><span style="color:#66d9ef">year</span> contract) <span style="color:#f92672">|</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">|</span> <span style="color:#f92672">`</span>ai<span style="color:#f92672">-</span>hq.io<span style="color:#f92672">`</span> <span style="color:#f92672">|</span> <span style="color:#f92672">~</span><span style="color:#960050;background-color:#1e0010">$</span><span style="color:#ae81ff">38</span><span style="color:#f92672">/</span><span style="color:#66d9ef">year</span> <span style="color:#f92672">|</span> Tech startup preferred <span style="color:#f92672">|</span> </span></span></code></pre></div><h2 id="github-release">GitHub Release </h2><p>This skill is released as open source.</p> <p>🔗 <strong>GitHub:</strong> <a class="link" href="https://github.com/yarang/skill-domain-checker" target="_blank" rel="noopener" >https://github.com/yarang/skill-domain-checker</a></p> <h3 id="installation">Installation </h3><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>git clone https://github.com/yarang/skill-domain-checker.git </span></span><span style="display:flex;"><span>cp -r skill-domain-checker ~/.claude/skills/domain-checker </span></span></code></pre></div><h2 id="business-value">Business Value </h2><table> <thead> <tr> <th>Aspect</th> <th>Improvement</th> </tr> </thead> <tbody> <tr> <td><strong>Time Savings</strong></td> <td>90% reduction in domain search time (10 min → under 1 min)</td> </tr> <tr> <td><strong>Cost Efficiency</strong></td> <td>Supports optimal selection through TLD comparison</td> </tr> <tr> <td><strong>Documentation</strong></td> <td>Easy team sharing with auto-generated reports</td> </tr> <tr> <td><strong>Productivity</strong></td> <td>Focus on core problems by automating repetitive tasks</td> </tr> </tbody> </table> <h2 id="conclusion">Conclusion </h2><p>Domain Checker is more than a simple domain search tool. It&rsquo;s a productivity tool that helps developers and entrepreneurs escape repetitive tasks and focus on truly important problems.</p> <p>By solving small daily inconveniences with AI and automation, we can create greater value.</p> <hr> <p><strong>Related Projects:</strong></p> <ul> <li><a class="link" href="https://github.com/yarang/skill-server-status-checker" target="_blank" rel="noopener" >server-status-checker</a> - SSH config-based server status checker</li> </ul> <p><strong>Tags:</strong> #DevTools #OpenSource #Claude #AI #Productivity #Domain</p> <p><strong>Korean Version:</strong> <a class="link" href="https://blog.agentthread.dev/ko/post/2026-03-09-001-%ea%b0%9c%eb%b0%9c%ec%9e%90-%ec%83%9d%ec%82%b0%ec%84%b1%ec%9d%84-%eb%86%92%ec%9d%b4%eb%8a%94-%eb%8f%84%ea%b5%ac-domain-checker-skill-%ec%86%8c%ea%b0%9c/" >한국어 버전</a></p>