Reference tools

HTTP status codes, well-known ports, User-Agent, MAC OUI, cron

Cron expression parser

Translate cron syntax to plain English and preview the next 10 fire times.

HTTP status code reference

Quick reference for every HTTP status — 100 to 599. RFC reference + safe to retry.

MAC address / OUI lookup

Identify the manufacturer behind a MAC address (first 24 bits = OUI).

Well-known ports reference

TCP/UDP service-port reference. Lookup a number, see the protocol.

User-Agent parser

Parse User-Agent strings — browser, engine, OS, device, bot detection.