Network & Security

C Network & Security Chmod Calculator Toggle rwx for user, group, and other to get octal and symbolic modes, or reverse from octal. Open tool

C Network & Security CIDR / Subnet Calculator Calculate network address, broadcast, host range, and host count from an IPv4 CIDR notation. Open tool

C Network & Security CORS Header Builder Generate Access-Control-Allow-* response headers for origins, methods, headers, and credentials. Open tool

C Network & Security Credit Card Luhn Check TEST/DEMO ONLY: Luhn check plus Visa/Mastercard/Amex/Discover brand detect by prefix. Never stores real cards. Open tool

C Network & Security Content-Security-Policy Builder Compose a Content-Security-Policy header from common directives like default-src, script-src, and style-src. Open tool

D Network & Security DMARC Record Generator Compose a DMARC TXT policy with p, rua, ruf, pct, and adkim/aspf alignment options. Open tool

D Network & Security DNS Lookup Query DNS A, AAAA, MX, and TXT records via Google DNS-over-HTTPS from the browser. Open tool

E Network & Security Email Header Parser Parse pasted raw email headers into key fields like From, To, Subject, Date, and Received hops. Open tool

H Network & Security HAR Viewer Upload a HAR JSON file and list entries with method, URL, status, and time. Client parse only. Open tool

H Network & Security Hash Type Identifier Guess likely hash algorithms from length and charset heuristics for hex, base64, and common password-hash prefixes. Open tool

H Network & Security htpasswd Generator Generate Apache-style {SHA} base64 SHA-1 htpasswd lines or a custom user:sha256hex pair in the browser. Open tool

H Network & Security HTTP Header Parser Parse pasted raw HTTP headers into a readable list for debugging responses and requests. Open tool

I Network & Security IP Lookup Look up IP or domain geo data and DNS records for quick network context during troubleshooting. Open tool

P Network & Security Passphrase Generator Diceware-like passphrase generator with an embedded list of about 200 common words, word count, and separator. Open tool

P Network & Security Password Strength Meter Check password strength with instant feedback so you can improve weak choices before saving them. Open tool

P Network & Security PEM Certificate Decoder Parse PEM text labels, measure base64 payload length, and show basic structural fields without full X.509 ASN.1 decoding. Open tool

S Network & Security SPF Record Generator Build a starter SPF TXT record from common mechanisms like include, ip4, and all policy. Open tool

S Network & Security SSL Checker Inspect a domain's SSL certificate validity, expiry, issuer, and encryption details via a server check. Open tool

S Network & Security Strong Password Generator Generate multiple strong random passwords with length and character-set controls plus an on-page strength meter. Open tool

S Network & Security Subnet Visualizer Visualize an IPv4 CIDR: network, broadcast, hosts, wildcard, and a binary mask view that complements the CIDR calculator. Open tool

T Network & Security TOTP Generator Generate RFC 6238 TOTP codes client-side with Web Crypto HMAC-SHA1, base32 secrets, countdown, and otpauth URL text. Open tool

U Network & Security User-Agent Parser Parse user-agent strings into readable browser, OS, and device hints for support and analytics debugging. Open tool

W Network & Security WebSocket Tester Connect to a ws or wss URL in the browser, send messages, view a log, and disconnect. Warns about mixed content. Open tool

W Network & Security WireGuard Config Generator Generate WireGuard interface templates with key placeholders. Uses labeled random base64 when Curve25519 WebCrypto is unavailable. Open tool