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Network & Internet Tools

30 tools

Network diagnostic calculators for IPv4/IPv6 CIDR prefixes, DNS records, cURL commands, and subnet masks.

All Network & Internet Tools IPv4 & IPv6 Subnetting & CIDR (9) SPF, DKIM & DMARC Email Security (6) cURL Builder & CORS Diagnostics (10) MAC Address OUI & Port Reference (5)
SPF, DKIM & DMARC Email Security Processed in your browser
DNS Records Builder & Zone File Generator
Generate standardized RFC 1035 DNS zone file records (A, AAAA, CNAME, MX, TXT, SPF, DKIM, DMARC, SRV, CAA) with syntax validation.
SPF, DKIM & DMARC Email Security Processed in your browser
Reverse DNS PTR Record Generator
Convert IPv4 and IPv6 addresses into in-addr.arpa and ip6.arpa reverse lookup zone domain strings and PTR record declarations.
MAC Address OUI & Port Reference Processed in your browser
Ethernet Cable Pinout & Wiring Color Guide
Interactive visual wiring color guide for RJ45 Ethernet termination standards T568A, T568B, straight-through, and crossover network cables.
MAC Address OUI & Port Reference Processed in your browser
MAC Address Format Converter & Normalizer
Normalize and convert physical MAC addresses between colon-separated, hyphenated, Cisco dotted quad, and bare hexadecimal formats.
cURL Builder & CORS Diagnostics Processed in your browser
CORS Headers Configuration Builder
Configure Cross-Origin Resource Sharing (Access-Control-Allow-Origin, Methods, Headers, Max-Age) and generate drop-in server configurations.
cURL Builder & CORS Diagnostics Processed in your browser
SSL/TLS Cipher Suite & Protocol Reference
Interactive reference and compatibility guide for TLS 1.2/1.3 cipher suites, key exchange algorithms, and forward secrecy security levels.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
IPv4 Wildcard Mask & Cisco ACL Calculator
Convert subnet masks to Cisco wildcard masks (inverse masks) and generate access control list (ACL) network rule statements.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
MTU & TCP MSS Packet Overhead Calculator
Calculate maximum transmission unit (MTU), TCP maximum segment size (MSS), and encapsulation header overheads for IPv4, IPv6, PPPoE, IPSec, GRE, and WireGuard.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
Ping Latency & Network Jitter Calculator
Calculate network packet round-trip time (RTT), mean latency, jitter (PDV / RFC 3393), and packet loss percentage from ping logs or manual sample inputs.
cURL Builder & CORS Diagnostics Processed in your browser
HTTP Security Headers Policy Builder
Interactive builder for Content-Security-Policy (CSP), HSTS, X-Frame-Options, and Referrer-Policy with copyable Nginx & Apache directives.
SPF, DKIM & DMARC Email Security Processed in your browser
DNS DKIM Public Key Record Syntax Validator
Parse and validate DKIM TXT records (v=DKIM1; k=rsa; p=...) checking RSA key bit-length and selector syntax.
SPF, DKIM & DMARC Email Security Processed in your browser
DNS DMARC Email Security Policy Builder
Build RFC 7489 DMARC DNS TXT records for p=reject, quarantine, or none with aggregate and forensic report mailboxes.
SPF, DKIM & DMARC Email Security Processed in your browser
DNS SPF (Sender Policy Framework) Record Builder
Generate RFC 7208 compliant SPF TXT records with ip4, a, mx, include mechanisms and ~all / -all qualifiers.
MAC Address OUI & Port Reference Processed in your browser
Ethernet Bandwidth & File Transfer Time Estimator
Calculate theoretical and real-world transfer durations across 100Mbps, 1GbE, 2.5GbE, and 10GbE LAN links factoring TCP overhead.
SPF, DKIM & DMARC Email Security Processed in your browser
DNS Record Lookup & Zone Formatter
Parse raw DNS zone files and BIND syntax into structured tables, check record TTL compliance, and generate dig commands.
cURL Builder & CORS Diagnostics Processed in your browser
HTTP Content Security Policy (CSP) Header Builder
Build hardened Content-Security-Policy response headers for default-src, script-src, style-src, and frame-ancestors.
MAC Address OUI & Port Reference Processed in your browser
Bandwidth & Download Transfer Time Calculator
Calculate exact file transfer durations across internet speeds (Fiber, 5G, Starlink, Wi-Fi 6) with real-world packet overhead factors.
cURL Builder & CORS Diagnostics Processed in your browser
HSTS Preload & Strict-Transport-Security Validator
Verify HTTP Strict-Transport-Security (HSTS) headers against official browser preload requirements (max-age, subdomains).
MAC Address OUI & Port Reference Processed in your browser
MAC Address OUI & Vendor Lookup
Look up IEEE Organizationally Unique Identifier (OUI) hardware vendors, manufacturers, and network interface scopes.
cURL Builder & CORS Diagnostics Processed in your browser
TLS SNI & SAN Wildcard Domain Matcher
Test hostnames against Subject Alternative Names (SAN) and wildcard certificate rules (*.example.com) for TLS compliance.
cURL Builder & CORS Diagnostics Processed in your browser
cURL to JavaScript Fetch Code Converter
Convert raw command-line cURL commands into modern JavaScript fetch() requests, Python requests, and PHP code snippets.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
Synthetic IP Geolocation Test Dataset Generator
Generate mock IP addresses with realistic synthetic country codes, cities, ASNs, and lat/long coordinates for dev testing.
cURL Builder & CORS Diagnostics Processed in your browser
HTTP Status Code Quick Reference
Comprehensive RFC reference guide for HTTP 1xx, 2xx, 3xx, 4xx, and 5xx status codes with caching rules and debugging guidance.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
IPv4 to IPv6 Transition & 6to4 Address Generator
Compute IPv4-mapped IPv6 (::ffff:x.x.x.x), 6to4 prefix (2002::/16), and hexadecimal dual-stack representations.
cURL Builder & CORS Diagnostics Processed in your browser
URL Parameter & Query String Parser
Parse URLs into protocol, host, pathname, query parameters, and hash with live key-value parameter editing and JSON export.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
Subnet Mask to CIDR & Wildcard Prefix Converter
Convert IPv4 subnet masks (e.g. 255.255.255.0) to CIDR slash notation (/24), wildcard mask (0.0.0.255), and host capacity.
cURL Builder & CORS Diagnostics Processed in your browser
User-Agent String Parser & Client Detector
Parse User-Agent strings to extract browser family, version, OS platform, device architecture, and rendering engine.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
IP Range to CIDR Block Calculator
Convert arbitrary start and end IPv4 address ranges into the minimal set of matching CIDR network subnet blocks.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
IPv4 Subnet & CIDR Range Calculator
Calculate IPv4 network address, broadcast address, usable IP range, CIDR prefix, wildcard mask, and binary representation.
IPv4 & IPv6 Subnetting & CIDR Processed in your browser
IPv6 Address Compressor & Expander
Convert IPv6 addresses between compressed RFC 5952 representation and fully expanded 8-hextet formats with scope classification.

🛡️ Ejecución del lado del cliente y arquitectura de privacidad

Cada herramienta se ejecuta bajo una estricta arquitectura de privacidad local (P0). Sin enviar tus datos o archivos a servidores remotos.

🔒 Cero registro de datos
No tracking or database recording of your inputs, keys, or source documents.
⚡ Procesamiento local instantáneo
Zero network latency or server queue delays. Output is rendered instantaneously.
🌐 Funciona sin conexión
Continue working even during intermittent internet or offline environments.

Frequently Asked Questions

Are all Network & Internet Tools tools free?

Yes, 100% free with unlimited daily usage. There are no paywalls, subscriptions, or login requirements.

Is my data uploaded or stored anywhere?

Never. All operations happen in-memory inside your browser session. Once you refresh or close your browser tab, memory is cleared immediately.

Can I use these utilities on mobile or tablet?

Yes, all utilities are fully responsive and optimized for touch devices and small viewports without loss of functionality.

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