Network / IT Tools

Subnet calculator, chmod, SSL decoder, user agent parser, MIME lookup, IP converter, and bitmask calculator.

Subnet Calculator

CIDR notation, usable hosts, network/broadcast address.

chmod Calculator

Visual Unix file permission builder (symbolic + octal).

SSL/PEM Certificate Decoder

Paste PEM certificate, show subject, issuer, validity, SANs.

User Agent Parser

Parse UA strings into browser, OS, device, and bot info.

MIME Type Lookup

Search file extensions to MIME types and vice versa.

IPv4/IPv6 Converter

Convert between address formats, validate, identify class.

Bitmask Calculator

Calculate, visualize, and combine bitmask/flag values.