All Network Diagnostic Tools
Access our complete collection of fast, accurate, and security-conscious network diagnostic utilities designed for developers, systems administrators, and security teams.
DNS & Nameservers
DNS Record Lookup
Query authoritative global nameservers to analyze full DNS records, examine TTL values, detect propagation state, and evaluate email/domain security headers.
Domain to IP Lookup
Resolve a hostname to its public IPv4 and IPv6 addresses through public resolvers, with TTLs and one-click IP intelligence for each address.
CNAME Lookup
Query the CNAME (canonical name) record for any hostname to reveal alias chains used by CDNs, SaaS custom domains, and load balancers.
TXT Record Lookup
Retrieve every TXT record published for a domain and automatically classify SPF policies, site-verification tokens, and other text entries.
DNSKEY Lookup
Fetch the DNSKEY records of a DNSSEC-signed zone and decode each key's flags, signing algorithm, key tag, and validation status.
DS Record Lookup
Query Delegation Signer (DS) records published in the parent zone and decode key tag, algorithm, and digest type to verify the DNSSEC chain of trust.
DNS Change Analyzer
Check whether a DNS change has propagated by comparing the authoritative nameservers' answer with what 14 major public resolvers are currently serving.
Domain DNS Validation
Run 25+ standards-based checks on a domain's delegation, SOA timers, web and mail records, email authentication and DNSSEC chain of trust.
DNS Health Checker
Score a domain's overall DNS health across nameservers, SOA, web, mail, email security and DNSSEC, with the most important problems listed first.
Domain Scanner
Passively enumerate subdomains using public Certificate Transparency logs and common hostnames, then check which ones resolve today.
Identity & Whois
WHOIS & RDAP Lookup
Modern Registration Data Access Protocol (RDAP) client with WHOIS fallback to retrieve domain ownership history, registrar contact information, and DNSSEC status.
IP & ASN Intelligence
Lookup IP address metadata including Autonomous System Number (ASN), network provider, country, city, bogon validation, and reverse DNS pointer records.
Reverse IP Lookup
List the domains that share an IP address, together with its reverse DNS name and network owner, to understand shared hosting and neighbours.
Domain Availability Checker
Search registry RDAP data to see whether a domain is available to register, or who holds it and when it expires, across popular extensions.
Website Hosting Checker
Identify a website's hosting company, CDN, DNS host, email provider and platform from its IP ownership, DNS records and HTTP headers.
Security & Ports
Safe Port Scanner
Non-intrusive diagnostic port prober with SSRF guardrails. Analyze exposed TCP services, latency, and firewall response states for authorized hostnames.
IP & Email Blacklist Checker
Query 19 IP blocklists and 3 domain blocklists (DNSBL/RHSBL) to see whether a mail server IP or domain is blacklisted, why, and how to get delisted.
IP Reputation Checker
Get a reputation score from 0 to 100 for any IP address, combining blocklist listings, proxy/VPN/data-centre detection and forward-confirmed reverse DNS.
Phishing Link Checker
Analyse a suspicious URL for phishing: look-alike domains, domain age, threat blocklists, credential forms and redirects, all inspected safely from our servers.
Website Security Scanner
Passively scan a website's HTTP security headers (CSP, HSTS, X-Frame-Options…), TLS certificate, cookie flags, mixed content and security.txt, with a letter grade.
Connectivity & Routing
Online Ping Tool
Execute precision diagnostic ICMP/TCP ping sequences to measure network latency, minimum/average/maximum response times, standard deviation, and packet loss.
Traceroute Visualizer
Discover the physical routing hops between edge diagnostic servers and target hostnames. Inspect intermediate gateway IPs, reverse DNS, and hop latency anomalies.
Email Authentication
SPF Checker
Check a domain's SPF record for syntax errors, the 10-DNS-lookup limit, void lookups and weak policies, with the full include tree and every authorized IP range.
SPF Record Generator
Create an SPF TXT record by picking your email providers and servers, with live lookup counting and validation before you publish.
DMARC Checker
Look up and validate a domain's DMARC record: policy, subdomain policy, percentage, alignment and reporting addresses, including external-report authorization.
DMARC Generator
Generate a DMARC TXT record step by step (policy, subdomain policy, rollout percentage, report addresses and alignment) with best-practice guidance.
DMARC Report Analyzer
Upload DMARC aggregate reports (.xml, .gz or .zip) to see who sends mail as your domain, DKIM/SPF alignment and failures. Reports are processed entirely in your browser.
DKIM Checker
Look up a DKIM selector's public key and check its length, algorithm and flags, or auto-discover keys used by common email providers.
DKIM Generator
Create a 2048-bit RSA or Ed25519 DKIM key pair locally with Web Crypto, and get the ready-to-publish DNS TXT record and private key.
BIMI Checker
Check whether a domain's brand logo can appear in inboxes: BIMI record, SVG Tiny PS logo validation, VMC/CMC certificate inspection and DMARC enforcement.
BIMI Generator
Build a BIMI TXT record from your logo and certificate URLs, and check your SVG against the SVG Tiny Portable/Secure profile before publishing.
Email Delivery
Email Header Analyzer
Paste raw email headers to see every server hop and delay, SPF/DKIM/DMARC results, and spoofing warning signs, analysed privately in your browser.
SMTP Test
Connect to a domain's mail server over SMTP to check the banner, supported extensions, STARTTLS/TLS version, certificate and response time. No email is sent.
Email Verifier
Verify an email address's syntax, domain and mail servers, and flag disposable, role-based and mistyped addresses before you send.
Certificates & Passwords
Certificate Decoder
Paste or upload a PEM/DER certificate, chain, PKCS#7 bundle or CSR to see its subject, SANs, validity, key, extensions and fingerprints, all decoded in your browser.
Certificate Converter
Convert SSL certificates and chains between PEM, DER/CER and PKCS#7/P7B formats, and split or join bundles, privately in your browser.
CSR Generator
Generate a CSR with Subject Alternative Names and a matching RSA or ECDSA private key in your browser, ready to submit to any certificate authority.
Password Encryption & Hashing
Generate and verify bcrypt, PBKDF2 and SHA hashes, and encrypt or decrypt text with a password using AES-256-GCM, all locally in your browser.
Random Password Generator
Create cryptographically secure random passwords with your choice of length, character sets and exclusions, with live entropy and strength.
Password Strength Checker
Estimate a password's real strength by detecting common passwords, words, patterns and dates, see crack times, and check breaches privately with k-anonymity.
IP Address Tools
What Is My IP
Find your public IPv4 or IPv6 address as websites see it, along with your ISP, ASN, approximate location and reverse DNS.
What Is My ISP
Identify your internet service provider, its autonomous system number (ASN), your connection type and approximate location from your public IP.
IP to Decimal Converter
Convert IPv4 and IPv6 addresses to and from decimal integers, hexadecimal, binary and octal notation, instantly in your browser.
IPv4 to IPv6 Converter
Express an IPv4 address in IPv6 notation: IPv4-mapped (::ffff:), NAT64 (64:ff9b::), 6to4 prefix and hex forms.
IPv6 to IPv4 Converter
Find the IPv4 address inside IPv4-mapped, NAT64, 6to4, Teredo and ISATAP IPv6 addresses, and learn when an IPv6 address has none.
IPv6 Range to CIDR
Turn any IPv6 or IPv4 address range into the smallest set of CIDR prefixes, and expand a CIDR block into its first address, last address and size.
IPv6 Compression
Compress full or partially shortened IPv6 addresses to the standard RFC 5952 format, in bulk.
IPv6 Expansion
Expand compressed IPv6 addresses (with ::) into the full eight-group, zero-padded notation, in bulk.
Local IPv6 Address Generator
Create a random fdxx::/48 Unique Local Address prefix for private IPv6 networks, with example subnets and host addresses.
IPv6 Compatibility Checker
Check a domain's IPv6 readiness: AAAA records for the site and www, IPv6 nameservers and mail servers, and a live IPv6 connection test.
MAC Address Lookup
Look up the vendor of a network device from its MAC address or OUI prefix, and see whether it's a randomised, multicast or globally unique address.
MAC Address Generator
Create random unicast, locally administered MAC addresses for VMs, containers and testing, in colon, hyphen, Cisco or bare formats.
Developer Tools
Website OS Checker
Detect a website's server operating system, web server software, backend language and CDN from its HTTP response headers.
MD5 Hash Generator
Create MD5, SHA-1 and SHA-256 hashes of text or files locally in your browser, and verify downloads against a published checksum.
Base64 Encoder / Decoder
Convert text and files to and from Base64 (standard, URL-safe or MIME-wrapped), decode data URIs and preview decoded images.
Multi-URL Opener
Paste a list of links (or any text containing them) and open them all in new browser tabs, in batches if pop-ups are limited.
.htaccess Redirect Generator
Build correct Apache .htaccess rules for 301/302 page redirects, domain moves, forcing HTTPS or www, folder moves and clean URLs.
URL Rewrite Generator
Generate Apache, Nginx and IIS rewrite rules that map clean paths like /product/123 to dynamic scripts like product.php?id=123.
Broken Link Checker
Scan a web page and test every link, image, script and stylesheet for 404s, errors and redirect chains.
Open Graph Checker
Check a page's Open Graph and Twitter Card tags, validate the share image size and preview social cards.
RAID Calculator
Work out usable storage, redundancy overhead, fault tolerance and relative performance for any RAID level and disk configuration.
Text to Binary Converter
Translate any text, including emoji and accented characters, into binary, hexadecimal, decimal or octal byte values.
Binary to Text Converter
Convert binary (01000001), hex, decimal or octal byte sequences back into UTF-8 text, with validation of malformed input.
JSON Formatter & Validator
Format, minify, sort and validate JSON in your browser, with precise line/column errors and a collapsible tree view.
Webmaster Tools
Website Link Analyzer
Extract and classify all links on a web page: internal vs external, nofollow/sponsored/ugc, anchor text, new-tab safety and linked domains.
User-Agent Viewer
View your browser's User-Agent and Client Hints, or parse any User-Agent string into browser, engine, OS, device type and bot.
PageRank Checker
Get the Open PageRank (0 to 10) and global rank of domains, computed from the Common Crawl link graph. Open PageRank is the successor to Google's retired toolbar PageRank.
Punycode Converter
Convert internationalised domain names and email addresses between Unicode and ASCII Punycode (xn--) form, in bulk.
Google SERP Simulator
See how your page's title tag and meta description will appear in Google desktop and mobile results, with pixel-accurate truncation.
Robots.txt Generator & Tester
Generate a robots.txt with path rules, sitemaps and per-crawler policies (including AI bots), and test whether any URL is allowed.
Designer Tools
RGB Color Converter
Convert RGB colour values to HEX, HSL, HSV and CMYK, check WCAG contrast and generate tints and shades.
HEX Color Converter
Convert HEX colour codes (#RRGGBB or #RGB) to RGB, HSL, HSV and CMYK, with contrast ratios and a tint/shade palette.
CMYK Color Converter
Convert CMYK print colour values to HEX and RGB for screens, and back, with a clear note on ICC profiles for print.
HSV Color Converter
Convert HSV (HSB) hue-saturation-value colours from design tools to HEX, RGB, HSL and CMYK, and back.
Productivity Tools
QR Code Generator
Generate free, non-expiring QR codes for URLs, Wi-Fi logins, vCards, email, SMS and phone numbers, with custom colours and PNG/SVG download.
QR Code Scanner
Decode QR codes from a photo, screenshot or your device camera, directly in the browser, and inspect links before opening them.
Wi-Fi QR Code Scanner
Scan a Wi-Fi QR code from an image or camera to reveal the network name (SSID), password and security type.
Image to Text (OCR)
Convert screenshots, scanned documents and photos of printed text to editable text with OCR that runs entirely in your browser.
Internet Speed Test
Test your internet connection's download and upload speed, latency (ping) and jitter against our server, with no app to install.
Time Card Calculator
Calculate hours worked from start and end times with unpaid breaks, overnight shifts, weekly overtime and gross pay, then export to CSV.
Credit Card Validator
Validate credit and debit card numbers with the Luhn algorithm and identify the network (Visa, Mastercard, Amex and more), entirely client-side.
BIN Checker
Identify the card network, issuing bank, card type (debit/credit/prepaid) and country for a BIN/IIN, the first 6 to 8 digits of a card.
Reverse Image Search
Find where an image appears online, its original source and similar pictures by searching it on Google Lens, Bing, Yandex and TinEye.
Social Username Checker
Check the availability of a username across developer, gaming and social platforms at once, with direct links to each profile.
Online Notepad
Write and keep multiple notes that auto-save in your browser's local storage, with no sign-up and nothing stored on a server, and download them as text.
Text Tools
Word Counter
Count words, characters (with and without spaces), sentences and paragraphs, estimate reading time and check social and SEO length limits.
Lorem Ipsum Generator
Generate Lorem Ipsum dummy text by paragraphs, sentences or words, optionally starting with the classic line and wrapped in <p> tags.
Small Text Generator
Convert normal text into tiny Unicode small caps, superscript and subscript letters you can paste into bios, usernames and chats.
ROT13 Encoder / Decoder
Apply ROT13, a Caesar cipher with any shift, or ROT47 to text instantly, in both directions.
Morse Code Translator
Convert text to International Morse code and Morse back to text, then listen to it at an adjustable words-per-minute speed.
Runic Translator
Transliterate English text into Elder Futhark, Younger Futhark or Anglo-Saxon Futhorc runes, and convert runes back to Latin letters.
Invisible Character Generator
Copy zero-width spaces, Hangul fillers and other invisible Unicode characters, or detect and remove hidden characters from pasted text.