Catalog
Choose a tool for the next check.
Every page is server-rendered for SEO and hands off only the form interactions to client components.
DNS Checker
Check all DNS records for any domain — A, MX, TXT, NS and more.
Check all DNS recordsPrecise DNSDIG
Run online DIG lookups for A, AAAA, MX, NS, TXT and more — terminal-style DNS answers without installing bind-utils.
Run DIG queryDomain ownershipWHOIS
Inspect public domain registration data, registrar details and lifecycle dates.
Lookup WHOISWeb response auditHTTP Header Checker
Audit response headers for security, cache behavior and transport details.
Check headersProtocol auditHTTP/2 Tester
Test whether a website negotiates HTTP/2 and inspect protocol, ALPN and TLS signals.
Test HTTP/2Browser securityBrowser Update Checker
Detect your browser version and see whether a safer update is available.
Check browser updateDomain to IPDomain IP Lookup
Find the IPv4 and IPv6 addresses for any domain, plus CNAME or canonical hostname details when DNS aliases are involved.
Find IP addressDomain historyDomain Age Checker
Check when a domain was created, updated and when it expires.
Check domain ageEmail authenticationDMARC Analyzer
Inspect a domain DMARC record, policy, alignment, reports and common configuration warnings.
Analyze DMARCEmail authenticationDKIM Validator
Look up the selector._domainkey TXT record for any domain and validate DKIM tags, key type and key length.
Check DKIM recordURL utilityURL Splitter
Split any URL into scheme, host, path, query parameters, fragment and normalized form.
Split URLCertificate auditSSL Certificate Checker
Verify certificate validity, expiration, issuer, SANs and negotiated TLS details for any host.
Check SSL certificateIDN utilityPunycode Converter
Convert internationalized domain names between readable Unicode and ASCII Punycode/IDNA form.
Convert PunycodeDNSBL reputationBlacklist Checker
Check domains and IP addresses against major DNS blocklists (Spamhaus, SpamCop, SURBL, SORBS and more).
Check reputationEncoding utilityBase64 Codec
Encode plain text to Base64 or decode Base64 back to text with auto-detect and optional URL-safe alphabet.
ConvertSecurity utilityPassword Generator
Generate strong passwords with accessible controls and instant copy actions.
Generate passwordSecurity utilityPassword Strength Checker
Estimate password strength, entropy, crack time and practical improvement suggestions.
Check password strengthSecurity utilityPassphrase Generator
Generate memorable random passphrases with word count, separators, numbers, symbols, and optional publish controls.
Generate passphraseNetwork utilityIP Calculator
Calculate network, broadcast, netmask, host range and address counts for IPv4 and IPv6 CIDR notation.
CalculatePayment card intelligenceBIN Checker
Look up the first 6–8 digits of a payment card to identify brand, type, issuing country and bank. Enter BIN only — never a full card number.
Lookup BIN