Free Online Tools for Networking, Development & Electronics

Open tools, no noise. A personal, open-source collection of practical tools — from networking and electronics to development and maths. No ads, no accounts, no tracking.

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IPv4 Subnet Calculator

Calculate network and broadcast addresses, CIDR range, usable hosts and subnet mask.

JSON Formatter & Validator

Format messy JSON, validate syntax and make nested data easier to read.

IP Lookup

Discover your public IP address with its approximate location, network provider and reverse DNS — resolved on our own server.

Ohm's Law Calculator

Calculate voltage, current, resistance or power from the values you already know.

NE555 Timer Calculator

Calculate resistor and capacitor values for 555 timer circuits in astable and monostable modes.

Base64 Encoder / Decoder

Convert text to Base64 and decode it back, with input validation and copy buttons.

UUID Generator

Generate unique identifiers for test data, development and quick prototyping.

Quadratic Equation Solver

Solve quadratic equations ax² + bx + c = 0 with real and complex roots calculation.

Percentage Calculator

Calculate percentages, percentage change, and solve various percentage problems.

Unit Converter

Convert between different units of length, weight, temperature, area, volume and speed.

DNS Lookup

Query A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records for any domain.

Port Checker

Check whether a TCP port is open on a host, straight from our server.

IP & Domain Info

Look up DNS records, reverse DNS, whois registration data plus geolocation and provider for any IP or domain.

Site Info

Inspect a website: resolved IP, HTTP status, server, page title and response time.

Password Generator

Generate strong random passwords and estimate their resistance to brute-force attacks.

CIDR / Netmask Converter

Convert between CIDR prefix, subnet mask and wildcard mask, with a full prefix reference.

IP / Binary Converter

Convert IPv4 addresses to binary, decimal and hexadecimal, and back again.

MAC Address Converter

Convert MAC addresses between formats and inspect their address type and OUI prefix.

Reverse IP Lookup

Find the PTR hostname behind an IP address, resolved by our own server.

Case Converter

Change text to UPPER, lower, Title, Sentence, camelCase, snake_case and more.

Word Counter

Count words, characters, sentences and paragraphs, with reading time and top keywords.

Text Diff Checker

Compare two texts line by line and highlight added and removed lines.

Lorem Ipsum Generator

Generate placeholder text as paragraphs, sentences or a set number of words.

Number Base Converter

Convert large integers between binary, octal, decimal and hexadecimal.

Scientific Notation Converter

Convert numbers to and from scientific and engineering notation.

Statistics Calculator

Mean, median, mode, variance, standard deviation and quartiles from a data set.

Prime Number Checker

Test primality, factorise a number and find the nearest primes around it.

Hash Generator

Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.

Timestamp Converter

Convert between Unix timestamps, ISO 8601 and readable local and UTC dates.

Regex Tester

Test regular expressions with flags, live highlighting and capture group inspection.

Color Converter

Convert colors between HEX, RGB and HSL, with a live picker and preview.

SSL/TLS Checker

Certificate, chain, SANs plus deep scan: TLS versions, cipher suites, OCSP stapling and CAA records.

HTTP Headers Inspector

Response status and headers, including HSTS, CSP and other security headers, with warnings.

Email DNS Checker

Check MX, SPF, DMARC, DKIM and PTR records for a domain.

DNS Propagation Checker

Compare answers from several public resolvers to see whether a record change has propagated.

Redirect Checker

Follow the redirect chain, showing every HTTP status code and the final URL.

Website Health Check

One report combining DNS, TLS, reachability and HTTP security headers.

Network Diagnostics

Forward and reverse DNS plus a TCP port check in a single page.

Email Deliverability Check

Analyse MX, SPF, DMARC and DKIM and explain common email configuration mistakes.

JWT Decoder

Decode a JWT header and payload locally in your browser and inspect its claims.

Anonymity Check

Inspect proxy headers, Tor and hosting signals, timezone mismatch, WebRTC leaks and optional port checks for your own IP.

Cron Expression Parser

Explain a five-field cron expression in plain English and preview the next scheduled runs.

URL Encoder & Decoder

Percent-encode or decode URL components and complete URIs entirely in your browser.

URL Parser

Split a URL into protocol, host, path, query and fragment, with a decoded query table.

YAML ↔ JSON Converter

Convert configuration between YAML and JSON locally using the js-yaml parser.

JSON to CSV Converter

Flatten nested JSON objects into CSV with configurable delimiters, headers and BOM.

JSON Diff

Compare two JSON documents structurally and list added, removed and changed values.

Redirect Generator

Generate nginx or Apache .htaccess redirect rules from a simple old-to-new list.

robots.txt Generator

Build a robots.txt with allow and disallow paths, crawl delay and a sitemap URL.

Security Headers Sanitizer

Check HTTP security headers, find weak values and generate a clean nginx snippet.

IPv6 Subnet Calculator

Calculate an IPv6 network range, prefix, address count and address type.

IPv6 Converter

Compress, expand and inspect IPv6 addresses in hex, decimal, binary and reverse DNS.

Unicode Inspector

Inspect code points, UTF-8 bytes, normalization and invisible or bidirectional controls.

Spam Blacklist Check

Test an IP, domain or email against public DNSBL and URIBL spam databases.

Website Security Audit

Grade a site A–F on HTTPS, security headers, HSTS preload, security.txt, cookie flags and mixed content.

DNSSEC Checker

Check DS, DNSKEY and RRSIG records and classify a domain as Secure, Insecure, Bogus or Indeterminate.

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No ads, no tracking.

No accounts, no sponsored placements. Tools work directly in your browser whenever possible, without sending your data anywhere.

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Open source.

OrbitNet is a personal, community-readable project. All source code is published on GitHub so anyone can inspect it, fork it, or self-host it.

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Frequently asked

Are the tools free?: Yes. Every tool is free, requires no account, and has no usage limits.
Do you store the data I enter?: No. Most tools run entirely in your browser. Tools that need network data, such as IP, DNS or HTTP checks, send only the request needed for that lookup. Results are not stored in a database; short-lived in-memory caches may keep them for up to an hour. See the Privacy page for details.
Can I self-host OrbitNet?: Yes. The source code is published on GitHub. The static site can be hosted on any web server, and the optional API runs as a separate service.