DNS Lookup - Online Domain Records Checker (A, MX, CNAME)
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
UD5 Toolkit
Explore all possible domain endings for your brand or keyword. Instantly generate full domain names and check availability with one click.
| TLD | Domain | Type | Actions |
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Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
Search by MIME or file extension to see the corresponding type. Helpful when configuring web servers. Static.
Search for any file extension to see its full name, MIME type, and description. Covers thousands of entries. Static data.
Enter an acronym and see its most common full forms. Static dictionary. No internet needed after load.
Query a domain's DNS record against multiple public resolvers (Google, Cloudflare) and see how it propagates. Client‑side fetch.
Enter a URL and a user‑agent to see if it is allowed or blocked by the robots.txt file. Quick bot validation.
Create a DMARC policy record with percentage, reporting addresses, and alignment mode. Validate and copy the final DNS TXT.
Check English spelling and get suggestions using the browser's built-in dictionary. Highlight errors instantly. No data leaves your machine.
Inspect any website's SSL/TLS certificate details: issuer, expiry date, subject, and SANs. Verify certificate chains. All checks are private and require no server upload.
Paste raw email headers and get a human-readable breakdown of the delivery route, authentication results, and delays. Private analysis.
Paste raw email headers and see authentication results (SPF, DKIM, DMARC) in a readable table. Find spoofing attempts.
Convert normal text to Unicode mathematical bold, italic, script, fraktur, and double‑struck. Copy rich text for anywhere.
Test how non‑Latin characters (Chinese, Cyrillic, Arabic) convert to URL‑safe slugs with proper transliteration rules. Preview the final string.
Paste two versions of the same idea and see a word‑level diff highlighting the rewrite. Not AI, just diff.
Paste N‑Triples data and convert it to a compact JSON‑LD representation. Work with linked open data. Local.
Normalize text to any Unicode normalization form to prevent encoding bugs and ensure consistent comparison. Essential for i18n developers.
Compare break‑all, keep‑all, and overflow‑wrap: anywhere/break‑word. Paste long words and see how they wrap.
Paste two strings that look the same and see if they differ after normalization. Debug invisible encoding bugs.
Practice positive/negative lookahead and lookbehind. See matches highlighted live. Master advanced regex.
Take an SVG element with multiple transform attributes and merge them into a single matrix. Simplify your SVG code locally.
Create a CAA DNS record to specify which certificate authorities can issue SSL certs for your domain. Prevent mis‑issuance.
Upload multiple text files and concatenate them into one, with optional separators. No upload; processed instantly.
Upload multiple audio files and join them into a single continuous track. Add crossfade. All local.
Paste text and quickly highlight potential proper nouns (capitalized sequences). Aid for editing or anonymization. Simple regex-based, local.
Check if an IBAN has the correct length and structure for its country. Early validation, no bank connection.
Validate ISBN‑10 and ISBN‑13 numbers and compute their check digits. Useful for booksellers and libraries. All local.
Parse a Snowflake ID (used by Discord, Twitter) into its timestamp, worker, and sequence components. Instant local decoding.
Test different line‑break and word‑break values on Chinese/Japanese/Korean text. See how browsers wrap. Essential for i18n.
Paste CSV data and instantly get a formatted MediaWiki table code. Ideal for Wikipedia editors and internal wikis.
Detect browser support for font‑tech() and font‑format() values in @font‑face src. Check COLRv1, variable, etc.