Validation

Validate 17-character Vehicle Identification Number (VIN) format and checksum

Validation

Validate ICCID numbers for SIM cards with Luhn checksum and issuer analysis

Validation

Validate and analyze ID card numbers from various countries with detailed breakdown

Security

Generate RFC 6238 TOTP (time-based, 6/8 digits, 30/60s step) and RFC 4226 HOTP (counter-based) one-time passwords from a base32 shared secret, fully offline with HMAC-SHA1/256/512, plus an otpauth:// URI for importing into Google Authenticator / Authy

Validation

Validate EU VAT numbers

Validation

Parse Title/Chapter/Article/Section/Subsection/Appendix municipal code citations, generate Bluebook Rule 12.9.2 legal citations, detect renumbering after recent ordinances (gaps, duplicates, out-of-order sections), and optionally live-verify hosted deep links.

Security

Detect phishing and fraud signals in a URL by deep structural analysis — punycode/IDN homograph attacks (mixed Latin/Cyrillic), embedded credentials (user:pass@host trick), high-risk TLDs, double-encoding and control-character smuggling, subdomain brand deception, and numeric/IP host obfuscation. Static analysis only, no network. Complements the URL Validator (which does basic protocol/IP checks).

Validation

Identify and validate tracking numbers from FedEx, UPS, DHL, USPS, SF Express (顺丰) and other major carriers

Validation

Validate GTIN-12 (UPC), GTIN-13 (EAN), GTIN-8, and GTIN-14 product barcodes with check digit verification

Validation

Validate United States driver's license numbers based on state-specific format rules (CA, NY, TX, FL, etc.)

Validation

Validate United States Employer Identification Number (EIN) format used for business tax identification

Validation

Validate United States Social Security Number (SSN) format with area number verification