One toolbox, not six pages

Speed test Measure your download, upload and latency. IP tools Your IP, reverse DNS, conversions and subnet maths. Network tools Ping, traceroute, DNS, port scan and TCP check. WHOIS Holder, dates and name servers of a domain or IP. SSL / TLS certificate Validity, chain, covered names and accepted protocols. HTTP headers Redirect chain, headers and a security score. Response time DNS, connect, TLS handshake and first byte, broken down. Global DNS propagation The same record as twelve public resolvers see it. SPF, DKIM and DMARC The three records that decide whether your mail arrives. SPF, DMARC and CAA generator Compose the record without a syntax slip. Mail blacklist (RBL) One IP address checked against thirty blocklists. SMTP check Banner, advertised extensions and STARTTLS. VLSM calculator Split a block into subnets of different sizes. Netmask converter CIDR, mask, wildcard and binary, all at once. IP range ↔ CIDR Turn an arbitrary range into CIDR blocks, and back. IPv6 ULA prefix A randomly drawn private /48, the way RFC 4193 wants it. Bulk reverse DNS The name behind every address in a list. MAC / OUI lookup The manufacturer behind a hardware address. IP geolocation An address's country, from a local database. ASN and prefix lookup The operator announcing an address, and its prefix.

Password generator Strong passwords generated in your browser. QR code generator Text, link, Wi-Fi, contact or SEPA transfer, as PNG or SVG.

Base64 Encode and decode Base64, text or file. URL encoding Percent-encoding: encode and decode an address. JSON formatter Pretty-print, minify and validate JSON. JSON ↔ YAML Move between the two formats, both ways. XML ↔ JSON Convert an XML document to JSON, and back. JWT decoder Read a token's header, payload and dates. Regex tester Test a pattern and see the matches live. Text diff See what changes between two versions. Case and slug Change the case, or build a clean slug. Word counter Words, characters, lines and reading time. Lorem ipsum Placeholder text to fill a mockup. Markdown → HTML Live preview and HTML code to copy. HTML entities Escape or restore special characters. MD5 and SHA hashes MD5, SHA-1, SHA-256, SHA-384, SHA-512 — text or file. HMAC signature Sign a message with a secret key. UUID and identifiers UUID v4, UUID v7, ULID and Nano ID, in batches. Unix timestamp Convert a timestamp to a date, and back. Cron expression Read a cron line in plain language and see the next runs. CSS: minify and format Compact a stylesheet, or tidy it back up. Colours and contrast HEX, RGB, HSL, and the WCAG contrast between two colours.