Small utilities for DNS, TLS, headers, and day-to-day troubleshooting. Each tool opens on its own page.
CIDR, network/broadcast addresses, usable host range, and wildcard mask.
Cryptographically random passwords with length and charset options.
Common TCP/UDP ports and typical services.
Lookup location, ISP, and ASN via ipapi.co.
TLS certificate validity, issuer, SANs, and key details.
Parse headers for SPF, DKIM, DMARC, routing, and metadata.
Query A, AAAA, MX, TXT, NS, CNAME, and more.
Reference table of common HTTP status codes.
PTR records for IPv4 and IPv6 addresses.
Decode a Windows Autopilot hardware hash to inspect embedded device metadata.
Build a v=spf1 TXT line from IPs, includes, and policy.
Encode files to Base64 or decode Base64 to a downloadable file.
Convert between YAML and JSON in the browser.
JavaScript RegExp tester with matches and replacement preview.
Map extensions to MIME types and back.
Create a QR image from text or a URL and download PNG.
OUI vendor hint from a device MAC address.
Length, mass, volume, and temperature conversions.