https://traceroute-online.com/check-dns-records/

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62            <h1 class="panel-title">
63                <span class="panel-title-icon">◈</span>
64                DNS Lookup
65            </h1>
66            <span class="panel-badge" id="status-badge">Ready</span>
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68        <div class="panel-body">
69            <!-- DNS Form -->
70            <form id="dns-form" class="mb-3">
71                <div class="form-group">
72                    <label class="form-label" for="target-input">Domain Name</label>
73                    <input type="text"
74                           name="target"
75                           id="target-input"
76                           class="form-input form-input-lg"
77                           placeholder="example.com"
78                           autocomplete="off"
79                           required>
80                    <p class="form-hint">Enter a domain name to query its DNS records</p>
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102                <h3 class="panel-title mb-2">

103                    <span class="panel-title-icon">⬡</span>
104                    DNS Records
105                </h3>
106                <pre id="dns-output" class="code-block"></pre>
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116                About DNS
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118            <span class="panel-badge">Reference</span>
119        </div>
120        <div class="panel-body">
121            <div class="info-box">
122                <div class="info-box-title">What is DNS?</div>
123                <div class="info-box-content">
124                    The Domain Name System (DNS) is the phonebook of the Internet. It translates human-readable
125                    domain names (like example.com) into IP addresses that computers use to identify each other
126                    on the network. Without DNS, you'd need to remember numerical addresses for every website.
127                </div>
128            </div>
129
130            <div class="info-box">
131                <div class="info-box-title">Common DNS Record Types</div>
132                <div class="info-box-content">
133                    <strong>A</strong> - Maps domain to IPv4 address<br>
134                    <strong>AAAA</strong> - Maps domain to IPv6 address<br>
135                    <strong>MX</strong> - Mail exchange servers (with priority)<br>
136                    <strong>NS</strong> - Nameservers authoritative for the domain<br>
137                    <strong>TXT</strong> - Text records (SPF, DKIM, verification)<br>
138                    <strong>CNAME</strong> - Canonical name (alias to another domain)<br>
139                    <strong>SOA</strong> - Start of Authority (zone information)<br>
140                    <strong>PTR</strong> - Reverse DNS (IP to hostname)
141                </div>
142            </div>
143
144            <div class="info-box">
145                <div class="info-box-title">Command Line Tools</div>
146                <div class="info-box-content">
147                    Query DNS records from your terminal:<br><br>
148                    <code>dig example.com ANY</code><br>
149                    <code>dig example.com MX +short</code><br>
150                    <code>nslookup example.com</code><br>
151                    <code>host -a example.com</code>
152                </div>
153            </div>
154
155            <div class="stats-grid mt-3">
156                <div class="stat-card">
157                    <div class="stat-card-value">13</div>
158                    <div class="stat-card-label">Root Servers</div>
159                </div>
160                <div class="stat-card">
161                    <div class="stat-card-value">~370M</div>
162                    <div class="stat-card-label">Registered Domains</div>
163                </div>
164                <div class="stat-card">
165                    <div class="stat-card-value">1983</div>
166                    <div class="stat-card-label">DNS Invented</div>
167                </div>
168            </div>
169        </div>
170    </section>
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173<!-- Bottom Info Section -->
174<section class="info-section">
175    <div class="info-section-content">
176        <div class="info-grid">
177            <!-- How DNS Works -->
178            <div class="info-card">
179                <h3 class="info-card-title">How DNS Resolution Works</h3>
180                <p>When you type a URL into your browser, a complex chain of queries begins. Your device first checks its local cache, then queries your configured DNS resolver (often your ISP's or a public resolver like 8.8.8.8 or 1.1.1.1).</p>
181                <p>If the resolver doesn't have the answer cached, it starts a recursive lookup: first querying a root server, then the TLD (top-level domain) server for .com/.org/etc., and finally the authoritative nameserver for the specific domain.</p>
182                <p>This entire process typically completes in under 100 milliseconds, and the result is cached at multiple levels to speed up future requests. TTL (Time-To-Live) values control how long each record stays cached.</p>
183            </div>
184
185            <!-- Security and DNS -->
186            <div class="info-card">
187                <h3 class="info-card-title">DNS Security Considerations</h3>
188                <p><strong>DNSSEC:</strong>

188 DNS Security Extensions add cryptographic signatures to DNS records, allowing resolvers to verify that responses haven't been tampered with. This prevents attackers from redirecting traffic to malicious servers.</p>
189                <p><strong>DNS over HTTPS (DoH):</strong> Encrypts DNS queries to prevent eavesdropping and manipulation by parties between you and the resolver. Major browsers now support DoH.</p>
190                <p><strong>DNS over TLS (DoT):</strong> Similar to DoH but uses a dedicated port (853) for encrypted DNS traffic, making it easier for network administrators to identify DNS traffic while maintaining privacy.</p>
191            </div>
192
193            <!-- Email Records -->
194            <div class="info-card">
195                <h3 class="info-card-title">Email-Related DNS Records</h3>
196                <p><strong>MX Records:</strong> Mail Exchange records specify which servers handle email for a domain, with priority values determining fallback order. Lower priority numbers indicate preferred servers.</p>
197                <p><strong>SPF (TXT Record):</strong> Sender Policy Framework lists which servers are authorized to send email for your domain, helping prevent email spoofing.</p>
198                <p><strong>DKIM:</strong> DomainKeys Identified Mail uses public key cryptography to sign outgoing emails. The public key is published as a TXT record for recipients to verify signatures.</p>
199                <p><strong>DMARC:</strong> Domain-based Message Authentication builds on SPF and DKIM, specifying how receivers should handle authentication failures.</p>
200            </div>
201
202            <!-- Practical Uses -->
203            <div class="info-card">
204                <h3 class="info-card-title">Practical DNS Lookup Uses</h3>
205                <p><strong>Troubleshooting Email:</strong> When email isn't working, checking MX records often reveals misconfigured mail servers or expired domains.</p>
206                <p><strong>Verifying Domain Ownership:</strong> Many services require adding a specific TXT record to prove you control a domain before enabling features.</p>
207                <p><strong>Finding CDN or Hosting:</strong> A records and CNAME records reveal which infrastructure serves a website—useful for identifying hosting providers or CDN services.</p>
208                <p><strong>Investigating Phishing:</strong> Comparing DNS records of suspicious domains with legitimate ones can reveal fraudulent sites mimicking trusted brands.</p>
209            </div>
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256<script>
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258            const target = new URLSearchParams(window.location.search).get('target');
259            const input = document.getElementById('target-input');
260            if (target && input) input.value = target;
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283<script>
284document.addEventListener('DOMContentLoaded', function() {
285    const form = document.getElementById('dns-form');
286    const loader = document.getElementById('loader');
287    const resultsContainer = document.getElementById('results-container');
288    const dnsOutput = document.getElementById('dns-output');
289    const errorMessage = document.getElementById('error-message');
290    const statusBadge = document.getElementById('status-badge');
291    const btnText = document.getElementById('btn-text');
292    const btnLoading = document.getElementById('btn-loading');
293    const lookupBtn = document.getElementById('lookup-btn');
294
295    form.addEventListener('submit', async function(e) {
296        e.preventDefault();
297
298        const target = document.getElementById('target-input').value.trim();
299        if (!target) return;
300
301        // Show loading
302        loader.classList.add('active');
303        resultsContainer.classList.remove('active');
304        errorMessage.classList.remove('active');
305        btnText.classList.add('hidden');
306        btnLoading.classList.remove('hidden');
307        lookupBtn.disabled = true;
308        statusBadge.textContent = 'Looking up...';
309
310        try {
311            const formData = new FormData();
312            formData.append('target', target);
313            formData.append('query_type', 'dns');
314
315            const response = await fetch('/query', {
316                method: 'POST',
317                body: formData
318            });
319
320            if (!response.ok) throw new Error(response.status === 429 ? 'Too many requests. Please wait before trying again.' : 'The lookup service is unavailable. Please try again.');
321            const data = await response.text();
322
323            if (data.includes('Invalid') || data.includes('Error')) {
324                errorMessage.textContent = data;
325                errorMessage.classList.add('active');
326                statusBadge.textContent = 'Error';
327            } else {
328                dnsOutput.textContent = data;
329                resultsContainer.classList.add('active');
330                statusBadge.textContent = 'Complete';
331            }
332        } catch (error) {
333            errorMessage.textContent = error.message || 'Failed to connect to the server. Please try again.';
334            errorMessage.classList.add('active');
335            statusBadge.textContent = 'Error';
336            console.error('DNS lookup error:', error);
337        } finally {
338            loader.classList.remove('active');
339            btnText.classList.remove('hidden');
340            btnLoading.classList.add('hidden');
341            lookupBtn.disabled = false;
342        }
343    });
344});
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