Developer Toolbox

Encode & Decode

Beautify, minify, validate, convert to XML/CSV

Beautify, minify, validate, convert to JSON

Base64 Encoder/Decoder

Base64 encode/decode for text and images

URL Encoder/Decoder

urlencode, urldecode, special character escaping

HTML encode/decode, strip tags, entity conversion

Convert between binary, octal, decimal and hexadecimal

CSV ↔ JSON Converter

Convert between CSV and JSON formats

CSV ↔ Markdown Converter

Convert CSV to Markdown tables and back

Compute MD5, SHA1, SHA256, SHA512 hashes

AES/DES Encryption

Symmetric encryption, CBC/ECB modes, 3DES

Parse and verify JWT tokens, Header/Payload/Signature

Password Generator

Secure random passwords, PINs, Diceware phrases

Date Calculator

Date add/subtract, difference, workdays, age

Cron Expression

Generate, parse, quick templates, next-run prediction

Unix Timestamp Converter

Unix timestamp converter, batch generate, timezone

Regex match, replace, debug and test

Compare text/code differences, side-by-side view

Case conversion, dedupe, sort, text statistics

Markdown Editor

Live edit & preview, WeChat theme, code highlight

Variable Name Converter

Convert between camelCase, snake_case and more (6 styles)

Code Beautifier

Format & minify HTML/CSS/JS/SQL

Generate UUID v4 in bulk, multiple formats

UserAgent Parser

Parse browser UA, detect device & OS

Complete ASCII table, character reference

IP geolocation, region, ISP lookup

Shorten long URLs, custom slugs, history

HTTP Status Codes

HTTP status code reference, categories, use cases

Beautify & minify SQL, syntax highlight, dialects

Subnet Calculator

CIDR calculation, IP range, usable hosts

TCP/UDP port reference, common service ports

Robots.txt Generator

Crawler rules, SEO optimization, Sitemap config

Image Compressor

Client-side compression, quality control, batch

Image Converter

Convert PNG/JPG/WebP, resize, Base64

QR Code Generator

Generate QR codes for WiFi, URLs, text

Color Converter

Convert between HEX, RGB, HSL, color picker

CSS Gradient Generator

Linear & radial gradients, multi-color stops, CSS code

Home Coding Subnet Calculator

Subnet Calculator

Quickly calculate IP ranges, CIDR, and usable hosts

IP Address

Subnet Mask / CIDR

Common CIDR Quick Select

Network Information

IP Address

Subnet Mask

Network Address

Broadcast Address

Usable Host Range

CIDR Notation

Total Hosts

Usable Hosts

Network Class

Type

Binary Representation

IP Address:

Subnet Mask:

Network Address:

How to Use

Enter an IP address and subnet mask
Supports CIDR notation (e.g. /24)
Automatically calculates network and broadcast addresses
Shows usable host count and range
Provides binary representation

Common Subnet Masks

/8 255.0.0.0 16M hosts

/16 255.255.0.0 65K hosts

/24 255.255.255.0 254 hosts

/25 255.255.255.128 126 hosts

/26 255.255.255.192 62 hosts

/27 255.255.255.224 30 hosts

/28 255.255.255.240 14 hosts

/30 255.255.255.252 2 hosts

Network Classes

Class A: 1.0.0.0 - 126.255.255.255

Class B: 128.0.0.0 - 191.255.255.255

Class C: 192.0.0.0 - 223.255.255.255

Private IP:

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

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