About this collection
Network and security utilities for IPv4/CIDR, MAC addresses, password entropy and HMAC. 6 free tools.
Network & Security
Network and security utilities for IPv4/CIDR, MAC addresses, password entropy and HMAC.
IPv4 Subnet / CIDR Calculator
Calculate network, broadcast, host range, mask and usable host count from an IPv4 address and CIDR prefix.
IPv4 ↔ Binary Converter
Convert an IPv4 address to a 32-bit binary representation and back.
IP in CIDR Checker
Check whether an IPv4 address belongs to a given CIDR network.
MAC Address Validator
Validate common MAC-address formats and normalize them.
Password Entropy Calculator
Estimate theoretical password entropy from password length and character-pool size.
HMAC Generator
Generate HMAC-SHA-256/384/512 from a message and secret using Web Crypto in your browser.