Domain Tools

The Domain Name System is the phonebook of the internet, and when a single record is wrong every user pays the price with a dead site, bouncing email, or an untrusted certificate. Our DNS toolkit gives operators, developers, and SREs a fast, resolver-accurate view of what the world actually sees for a domain — not just what one nameserver claims. Query A, AAAA, MX, NS, CNAME, PTR, CAA, and SOA records across 20+ global resolvers in parallel, enumerate subdomains from Certificate Transparency logs, and verify propagation after a change in seconds. Every tool runs free, in your browser, with no signup — built for troubleshooting migrations, launching new domains, hardening zones, and confirming that a fix is really live everywhere.

Modern inboxes reject or silently junk anything that fails SPF, DKIM, DMARC, or now MTA-STS — and one misconfigured record can quietly kill your campaigns, invoices, and password resets for weeks. Our email deliverability suite lets you audit every layer of authentication in seconds without touching a mail server. Parse and validate SPF and DMARC records, look up DKIM public keys by selector, verify BIMI logos, analyze raw email headers to trace every relay hop and timing gap, check any sending IP against 20+ real-time DNSBL blacklists, and confirm MTA-STS plus TLS-RPT policies to prove SMTP is encrypted in transit. Built for postmasters, marketers, and SaaS teams protecting sender reputation, hitting the inbox, and passing enterprise security reviews.

Every incident, abuse report, or capacity plan eventually comes down to an IP address, an ASN, or a subnet — and the answers need to be right the first time. Our IP and network toolkit gives you geolocation, ISP, organization, and ASN context for any IPv4 or IPv6 address, plus the utilities engineers actually use day to day. Instantly see your own public IP, ISP, and browser fingerprint, look up autonomous systems with prefixes and peers, calculate CIDR blocks, netmasks, host counts, and usable ranges for VLSM planning, and convert IPs between decimal, hex, binary, and IPv4-mapped IPv6 formats. Free, precise, and fast — built for network engineers, security analysts, cloud architects, and anyone chasing a packet through the internet.

The difference between a fast, secure, well-ranked site and a broken one usually lives in headers, redirects, and certificates most teams never inspect. Our Web and HTTP toolkit surfaces exactly what browsers, crawlers, and attackers see when they hit your URL. Inspect full response headers, status codes, TLS versions, and cipher details, trace every hop in a redirect chain to catch loops and lost link equity, verify SSL certificate issuers, expiry, SANs, and complete Certificate Transparency history via crt.sh, and grade HSTS, CSP, X-Frame-Options, and Referrer-Policy from A to F with fix suggestions. Detect the CMS running under the hood, and generate production-ready robots.txt and sitemap.xml files. Built for developers, SEOs, and security engineers shipping resilient, discoverable sites.

Great engineers keep a scratchpad of tiny utilities they reach for every day — format some JSON, test a regex, decode a token, convert a cURL, generate an ID. Our developer toolkit collects the best of them in one place, all client-side, all free, no ads or signups getting between you and the answer. Pretty-print, validate, and minify JSON, run a live JavaScript regex playground, encode and decode URLs, generate SHA-1 through SHA-512 hashes via Web Crypto, decode and sign JWTs with HS256/384/512, lint Content-Security-Policy for unsafe patterns, explain any cron expression in plain English with the next ten runs, batch-generate UUID v4/v7, ULID, NanoID, and KSUID, convert cURL commands to fetch, axios, Python, Go, or PHP, and build clean UTM campaign URLs.

Whether you're drafting a landing page, prepping a spec, or wrangling copy pasted from six different sources, small text utilities save real hours. Our text and writing toolkit covers the everyday operations content teams, developers, and students actually need — no distracting editors, no logins, just paste and go. Count words, characters, sentences, paragraphs, and estimated reading time to hit any brief, convert between UPPER, lower, Title, Sentence, camelCase, snake_case, and kebab-case in one click, diff two versions of a document line by line to spot every change, generate classic Lorem Ipsum placeholder text at any length, transform text into Morse, binary, or Base64, and stylize copy with Unicode small caps and script fonts for bios and headlines. Fast, private, and browser-based — nothing you paste ever leaves your device.

Some jobs don't fit neatly into DNS, networking, or code — they're the small security and hardware helpers you reach for once a week and want to trust completely. Our utilities collection covers exactly that. Generate long, cryptographically strong random passwords with configurable length and character sets, score any password by real entropy and estimated crack time while checking it against the Have I Been Pwned breach corpus using k-anonymity so the password never leaves your browser. Create high-resolution QR codes for URLs, WiFi credentials, and vCards as both PNG and SVG, generate random MAC addresses for testing and virtualization, and look up any MAC prefix against the official IEEE OUI database to identify the manufacturer instantly. Free, private, and built for security-conscious users.