Networking Utilities

Look up any HTTP status code and its meaning.

See your browser, screen, language and more.

Convert cURL commands to JavaScript fetch, axios, and Python requests.

Parse raw HTTP headers into JSON with security header audit.

Parse and inspect browser, engine, OS, device, and bot in User-Agent strings.

Query DNS records (A, AAAA, MX, TXT, CNAME, NS) via DNS-over-HTTPS.

Inspect network requests, waterfall timing, status codes, and headers from HTTP Archive (.har) files.

Search standard port numbers (0-65535), services, protocols, and vulnerabilities.

Look up MIME content types by file extension or find extensions for MIME types.

Visually construct cURL commands with HTTP methods, headers, authentication, and JSON bodies.

Calculate network CIDR, broadcast IP, netmask, wildcard, and usable host count.

Calculate monthly bandwidth usage, hosting data limits, and transfer throughput.

Validate IPv6 addresses, expand compressed addresses to 8 hextets, and compress with ::.

Format MAC addresses (colon, hyphen, dot), detect vendor OUI, and check unicast/multicast.

Parse HTTP Cookie strings and Set-Cookie headers, inspecting HttpOnly, Secure, and SameSite.

Break any URL into its components.

Calculate IPv4 CIDR subnet ranges, broadcast IPs, netmasks, and total host capacities.

Convert IPv4 addresses into 6to4, IPv4-mapped (::ffff:x.x.x.x), and hex formats.

Query domain registration, registrar, nameservers, and expiration dates via public RDAP.

Audit raw HTTP requests for Content-Length and Transfer-Encoding header smuggling conflicts.

Generate RFC 7617 Authorization: Basic header strings from username and password.

Verify Strict-Transport-Security header directives for Chrome HSTS preload list eligibility.