Network & Security Tools

Calculate network, broadcast and host ranges.

Convert dotted IPv4 to a 32-bit integer.

Convert an integer to dotted IPv4.

Expand compressed IPv6 notation.

Query public DNS-over-HTTPS records.

Look up public IP registration and location.

Find common TCP and UDP service ports.

Explain an HTTP status code.

Generate strong cryptographic passwords.

Estimate password entropy.

Create an HTTP Basic Authorization header.

Normalize a MAC address.

Build trusted WHOIS lookup links.

Get netmask, wildcard and host capacity.

Expand, compress and inspect IPv6 prefixes and address ranges.

Merge adjacent IPv4 networks and remove redundant routes.

Find the smallest IPv4 supernet covering a list of addresses.

Parse common DNS zone records into structured JSON.

Convert IPv4 CIDR prefixes to Cisco wildcard masks.

Review HTTP headers for security, caching and delivery issues.

Evaluate response CORS headers against an origin and credential mode.

Open a HAR file and summarize requests, timing, sizes and failures locally.

Convert common docker run commands to Compose YAML.

Check essential Kubernetes object fields and document structure.

Indent and normalize Nginx configuration blocks.

Check Compose services, images, builds, ports and volumes.

Create and verify HS256 JWTs entirely in your browser.

Inspect PEM certificate metadata, fingerprints and embedded names.

Identify key containers and inspect safe public metadata.

Derive and verify PBKDF2 hashes with configurable iterations and salt.

Generate safe, copy-ready commands for BCrypt and Argon2 workflows.

Generate RFC 6238 one-time codes from Base32 secrets.

Build or audit a Content-Security-Policy header.

Create SHA-256, SHA-384 or SHA-512 Subresource Integrity hashes.

Convert internationalized domain names with browser-native URL handling.

Check HIBP via k-anonymity; only a five-character hash prefix is sent.

Calculate SHA-256, SHA-384 and SHA-512 checksums locally.