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DecoderEncode DecodeDecode one X.509 PEM certificate and inspect subject, issuer, validity, SAN entries, fingerprints, serial number, signature, and key usage.→Character CounterTextMeasure characters with and without spaces, plus words and lines, for social posts, forms, metadata, and editing→Checksum CalculatorEncode DecodeCalculate CRC32, MD5, SHA-1, SHA-256, SHA-384, or SHA-512 checksums from exact text and compare deterministic outputs across systems.→Collapse SpacesTextCollapse repeated horizontal spaces into one space while preserving line breaks, paragraph structure, and the order of your text.→Comma List to LinesTextConvert comma-separated values into one trimmed item per line, omit empty entries, and prepare a clean vertical list for spreadsheets or imports.→Content-Type ParserDeveloperParse a Content-Type header into its media type, charset, boundary, and other parameters.→Cookie ParserDeveloperParse a Cookie request header into readable cookie names and values.→Cron 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output with type inference, nested models, arrays, and practical generation settings.→JSON to TOMLConverterConvert JSON objects into readable TOML configuration.→JSON to TOON ConverterConverterJSON to TOON Converter transforms JSON into compact TOON v4.1 syntax using indentation-based objects, explicit array lengths, and tabular rows for uniform object arrays.→JSON to TypeScriptConverterGenerate a TypeScript interface from representative JSON objects, arrays and primitive values, with a configurable root interface name.→JSON to XML ConverterConverterJSON to XML Converter transforms JSON objects and arrays into structured XML for integration, migration, and testing workflows.→JSON to YAMLConverterConvert valid JSON objects, arrays and scalar values to readable YAML while preserving nesting, strings, numbers, booleans, null and Unicode text.→JSON to Zod SchemaConverterConvert representative JSON into a Zod schema with nested objects, arrays, primitive types, null values, and optional 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copy.→Line CounterTextCount total, non-empty, and blank lines in text, code, lists, logs, and documents with a clear browser workflow→Lines to Comma ListTextJoin non-empty trimmed lines into one comma-separated list while preserving the original item order.→Local Business Schema GeneratorSeoGenerate LocalBusiness JSON-LD with address, contact, opening hours, price range, and coordinates.→Lowercase ConverterTextConvert cased letters to lowercase while preserving punctuation, spaces, and line breaks.→MCP Schema ValidatorValidatorValidate the core structure of one MCP tool definition, including its name, description, inputSchema, required fields, outputSchema, and annotations.→MCP Tool Schema GeneratorGeneratorGenerate a minimal MCP tool definition and Draft 2020-12 inputSchema from a tool name, description, and representative JSON arguments.→MD5 GeneratorGeneratorUse this free MD5 Generator to generate a MD5 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→MX LookupNetworkMX Lookup checks a domain’s mail exchanger records, priorities, TTL values, and receiving mail servers so you can verify email DNS routing.→Markdown PreviewTextRender common Markdown syntax as safe HTML so structure and formatting can be reviewed before publishing.→Markdown to HTMLConverterConvert common Markdown syntax into HTML for previews, documentation, articles, notes, and lightweight publishing workflows.→Mention ExtractorTextExtract unique @mentions from authorized text and preserve the order in which accounts first appear.→Meta Length CheckerSeoCheck SEO title and meta description lengths with practical search snippet guidance.→Meta Tags GeneratorSeoGenerate essential HTML meta tags for search, sharing, indexing, and canonical URLs.→NS LookupNetworkNS Lookup checks the authoritative nameserver records published for a domain so you can verify DNS delegation, hostnames, and TTL values.→Number ExtractorTextExtract signed integers and decimal values from mixed text while preserving their original order.→Open Graph GeneratorSeoGenerate Open Graph meta tags for rich social media previews.→OpenAPI GeneratorGeneratorGenerate an OpenAPI 3.1 document from endpoint settings and JSON request or response samples.→OpenAPI ValidatorValidatorValidate the required structure of OpenAPI 3.0 and 3.1 documents supplied as JSON or YAML.→Organization Schema GeneratorSeoGenerate Organization JSON-LD with identity, logo, contact and social profiles.→PEM FormatterEncode DecodeFormat PEM certificates and keys, validate matching boundary labels, and wrap Base64 content into standard 64-character lines.→Paragraph CounterTextCount non-empty text paragraphs separated by one or more blank lines.→Password Generator AdvancedGeneratorGenerate 1–100 secure random passwords with 8–256 characters, selectable character sets, similar-character removal, and custom exclusions.→Password Strength CheckerValidatorCheck password strength using length, character variety, repetition, sequences, and common-pattern signals while keeping the result easy to understand.→Phone Number ExtractorTextExtract likely phone numbers from mixed text while preserving their original appearance and order.→Ping TestNetworkSend ICMP echo requests to a public hostname or IP address and review packet loss and round-trip timing.→Port CheckerNetworkTest whether a TCP port on a public hostname or IP address accepts a connection and review connection timing and resolved destination.→Prefix LinesTextAdd the same prefix to every following line while preserving line order and line breaks.→Product Schema GeneratorSeoGenerate Product and Offer JSON-LD for visible product details.→Query String ParserNetworkParse a complete URL or raw query string into structured, readable JSON without changing the original input.→Quote LinesTextWrap every source line in quotation marks while preserving line order and line breaks.→RSA Key GeneratorGeneratorGenerate RSA public and private key pairs in PEM format with selectable key sizes and optional passphrase protection.→Random Password GeneratorGeneratorGenerate strong random passwords with a chosen length for accounts, test data, temporary credentials, and security-focused workflows.→Reading Time CalculatorCalculatorEstimate how long a text takes to read from its word count using a clear words-per-minute model.→Redirect Chain CheckerSeoTrace HTTP redirects, inspect status codes, detect loops, and identify unnecessary redirect hops.→Regex BuilderGeneratorBuild practical regular expressions from common matching requirements.→Regex ExtractorDeveloperExtract all regex matches and capture groups from text.→Regex Match HighlighterDeveloperHighlight every regex match directly inside source text so patterns can be reviewed visually before they are reused.→Regex ReplaceDeveloperReplace regex matches with text or capture-group references.→Regex SplitterDeveloperSplit text with a regular expression and return clean copyable segments without manually editing repeated delimiters.→Regex Tester PRODeveloperTest regular expressions with detailed matches, named groups, offsets, line and column positions, execution timing, and highlighted previews.→Remove All SpacesTextRemove every whitespace character, including spaces, tabs, and line breaks, to create one uninterrupted string.→Remove Duplicate LinesTextKeep the first occurrence of each exact line, remove later duplicates, and preserve the original line order.→Remove Duplicate WordsTextRemove repeated words case-insensitively while keeping each first spelling and the original first-seen order.→Remove Empty LinesTextDelete blank and whitespace-only lines while preserving every populated line in its original order.→Remove Line NumbersTextRemove leading line numbers from text while preserving the remaining line content and order.→Remove NumbersTextRemove numeric digits from text while keeping letters, punctuation, spacing, and line order available for review.→Remove PunctuationTextRemove punctuation characters from text while preserving words, numbers, spaces, and line order for review.→Remove TabsTextRemove tab characters from text while keeping the remaining content and line structure visible for comparison.→Remove WordTextRemove word with a focused browser utility that targets the entered term while keeping the original source visible for careful comparison.→Reverse DNS LookupNetworkLook up the PTR hostname for a public IPv4 or IPv6 address and verify whether the hostname resolves back to the same address.→Reverse LinesTextReverse lines with a focused browser tool that changes only the order of complete lines while keeping every word, number, symbol, and punctuation mark inside each line unchanged.→Reverse TextTextReverse text with a browser utility that returns characters in the opposite order while keeping the original source visible for direct comparison.→Reverse WordsTextReverse words with a focused tool that changes the order of word tokens while keeping the characters inside each individual word readable.→Robots.txt GeneratorSeoBuild a valid robots.txt file with user-agent, allow, disallow, crawl delay, and sitemap rules.→Robots.txt Tester & ValidatorSeoValidate robots.txt syntax, inspect crawler directives, and test whether a URL is allowed for a selected user-agent.→SERP Snippet PreviewSeoPreview a Google-style search result and check title and description lengths.→SHA1 GeneratorGeneratorUse this free SHA1 Generator to generate a SHA-1 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→SHA256 File Checksum GeneratorGeneratorCalculate a SHA-256 checksum for any local file or exact text, then compare it with a published 64-character digest without uploading the file.→SHA512 Generator & SHA256 ComparisonGeneratorGenerate a 128-character SHA-512 digest for long text or hexadecimal key material and compare it with SHA-256 calculated from the same bytes.→SQL 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Case ConverterTextThis sentence case converter changes irregular capitalization into a sentence-style pattern while keeping the original text available for comparison.→Sentence CounterTextUse this sentence counter to estimate the number of sentence units in articles, essays, notes, product descriptions, and other text.→Set-Cookie ParserDeveloperParse a Set-Cookie response header into its cookie value, scope, expiry, and security attributes.→Shuffle LinesTextShuffle lines into a random order while keeping every line available for review in a separate result.→Sitemap ValidatorSeoValidate XML sitemap syntax, structure, URLs, duplicates, namespaces, and optional metadata.→Slug GeneratorTextSlug Generator creates a clean, lowercase, hyphenated URL slug from any title or phrase. 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hexadecimal, and Base64 tokens from cryptographically secure random bytes.→TracerouteNetworkTrace the network path to a public hostname or IP address and review each responding hop and latency.→Trim WhitespaceTextRemove unwanted spaces around every line without changing the meaningful text inside each line.→Twitter Card GeneratorSeoGenerate Twitter Card metadata for link previews on X and compatible platforms.→URL DecoderEncode DecodeDecode valid percent-encoded UTF-8 text while preserving literal plus signs for accurate URL-component inspection.→URL EncoderEncode DecodePercent-encode UTF-8 text for use as one URL component while preserving JavaScript encodeURIComponent-safe characters.→URL ExtractorTextExtract web addresses from text, HTML, logs, exports, and documents for audits, migration, outreach, and review→URL ParserNetworkSplit an absolute URL into scheme, host, port, user information, path, query parameters, and fragment.→URL Query BuilderGeneratorURL Query Builder creates RFC 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Network
Ready
WHOIS Lookup
Query public WHOIS registry data for a domain and inspect registrar, dates, nameservers, statuses, and raw WHOIS output.
IANA WHOIS discovery registry WHOIS query IANA RDAP bootstrap fallback RDAP registration lookup
WHOIS availability varies by registry. Some registries redact registration data or block port 43 queries.
Private browser processing. Your input is processed on this device and is not sent to the Trexmi server.
INPUT Domain name *
WHOIS lookup results
Registrar, registration dates, nameservers, statuses, registry server, and raw WHOIS response.
WHO
WHOIS / RDAP lookup
Data source
Registry server
RDAP server
DNSSEC
Nameservers
Domain statuses
Referral WHOIS server
About the tool
What WHOIS Lookup does
WHOIS Lookup queries public WHOIS infrastructure for registration and registry information about a domain. The tool first asks IANA which WHOIS server handles the top-level domain, then queries the appropriate registry or referral server and organizes common fields into a readable report.
WHOIS data can include the registrar, creation date, expiration date, updated date, nameservers, domain statuses, DNSSEC state, and additional registry information. Privacy rules and registry policies mean many personal contact fields are redacted, so WHOIS Lookup should be treated as a technical domain-registration diagnostic rather than a guaranteed ownership directory.
How to use
- Enter a domain. Use a registrable domain such as
example.com, not a full URL. - Run WHOIS Lookup. Trexmi asks IANA for the correct WHOIS server and then queries that registry.
- Review the overview. Check registrar and available creation, update, and expiration dates.
- Inspect nameservers and statuses. Domain status values can reveal transfer or deletion locks.
- Use Raw WHOIS for verification. The raw server response preserves fields that may not fit a normalized summary.
Built for the task
Why use WHOIS Lookup?
Focused controls, predictable output, and a workflow designed around this exact transformation.
01
Find registry information
Discover registrar and registry data returned by the public WHOIS infrastructure.
02
Review important dates
See creation, update, and expiration fields when the registry publishes them.
03
Inspect nameservers
Compare WHOIS nameservers with live DNS data during migrations or troubleshooting.
04
Keep the raw response
Open the complete WHOIS text when registry-specific details matter.
Useful answers
Questions about WHOIS Lookup
Practical details about input, output, privacy, limits, and the best way to use this tool.
01 What is WHOIS Lookup?
WHOIS Lookup queries public registry services for technical and registration data associated with a domain name.
02 Why is registrant information hidden?
Privacy regulation, registrar privacy services, and registry policies often redact personal registration data from public WHOIS responses.
03 Does every domain use the same WHOIS format?
No. Registries and registrars use different field names and output formats. Trexmi normalizes common fields and keeps the raw response available for everything else.
04 Why can WHOIS Lookup fail?
Some hosting environments block outbound port 43, some registries rate-limit queries, and a registry may not provide classic WHOIS service for a particular TLD.
05 Is WHOIS the same as DNS?
No. WHOIS describes registration and registry metadata. DNS resolves operational records such as IP addresses, mail servers, and nameservers.
How WHOIS Lookup works
The WHOIS Lookup starts with the top-level domain. For example.com, the TLD is com. Trexmi queries IANA to find the registry WHOIS service associated with that TLD, then sends the domain name to the returned server. If the registry response identifies a registrar WHOIS server, the tool can query that referral as well.
Classic WHOIS uses TCP port 43 and returns plain text. Different registries label the same concept differently, which is why the visual report focuses on common fields while keeping Raw WHOIS available for inspection.
Important WHOIS fields
The registrar identifies the company managing the domain registration for the registrant. Creation, updated, and expiration dates help establish the registration lifecycle, although registries may format dates differently. Nameserver fields describe the DNS servers delegated for the domain at the registry level.
Compare nameserver information with live records using DNS Lookup. A migration can appear incomplete when the registry delegation still points to old nameservers even though DNS records were already prepared elsewhere.
Understanding domain status values
Generic top-level domains can publish EPP status values such as clientTransferProhibited, serverTransferProhibited, or deletion-related states. Transfer locks are common security controls and do not by themselves indicate a problem. Unexpected redemption or pending-delete states deserve immediate attention from the registrar.
WHOIS Lookup displays all status lines returned by the registry instead of reducing them to one value. This makes it easier to preserve the registry response when several controls are active at once.
WHOIS privacy, RDAP, and limitations
Modern public registration data is often redacted. A blank registrant name or email does not mean the domain is unowned. It normally means the registry or registrar does not publish that personal information through public WHOIS.
RDAP is a newer structured registration-data protocol that complements or replaces classic WHOIS. Trexmi first uses direct WHOIS where available and can fall back to the official RDAP service discovered through the IANA bootstrap data when WHOIS is incomplete, unavailable, or blocked. This improves coverage without relying on a commercial third-party API.
WHOIS data is useful for operational diagnostics, but do not treat it as definitive legal ownership evidence. Registration records can be protected by privacy services, proxies, resellers, and jurisdiction-specific policies.
Related Trexmi network tools
Use DNS Lookup to inspect operational DNS records, URL Parser to isolate the hostname from a full URL, Redirect Chain Checker to inspect the website route, and HTTP Status Code Lookup when interpreting HTTP responses.
Authoritative WHOIS and RDAP references
For official registration-data reference material, see the IANA WHOIS Service, the IANA RDAP DNS bootstrap registry, and the ICANN WHOIS information. These external DoFollow references document the public registration-data ecosystem used by the lookup.
WHOIS Lookup summary
WHOIS Lookup is most useful for registrar identification, registration lifecycle dates, nameserver delegation, domain status values, and registry troubleshooting. Always account for redaction and registry-specific formats, and compare registration data with live DNS and HTTP behavior before drawing conclusions about a domain configuration.