decrypting…# 🌐 Subnetting Cheat Sheet 🚀 #CS #networking > **A Fancy, Feature-Rich Guide to Mastering Subnetting!** ## 🔢 CIDR & Subnet Mask | CIDR | Subnet Mask | Total Addresses | Wildcard Mask | |------|------------|----------------|--------------| | /32 | 255.255.255.255 | 1 | 0.0.0.0 | | /31 | 255.255.255.254 | 2 | 0.0.0.1 | | /30 | 255.255.255.252 | 4 | 0.0.0.3 | | /29 | 255.255.255.248 | 8 | 0.0.0.7 | | /28 | 255.255.255.240 | 16 | 0.0.0.15 | | /27 | 255.255.255.224 | 32 | 0.0.0.31 | | /26 | 255.255.255.192 | 64 | 0.0.0.63 | | /25 | 255.255.255.128 | 128 | 0.0.0.127 | | /24 | 255.255.255.0 | 256 | 0.0.0.255 | | /23 | 255.255.254.0 | 512 | 0.0.1.255 | *And more...* 🏗 --- ## 🖥 IPv4 Address Classes | Class | Range | Default Subnet Mask | |-------|------------------------|----------------| | A | 0.0.0.0 - 127.255.255.255 | 255.0.0.0 | | B | 128.0.0.0 - 191.255.255.255 | 255.255.0.0 | | C | 192.0.0.0 - 223.255.255.255 | 255.255.255.0 | | D | 224.0.0.0 - 239.255.255.255 | Multicast | | E | 240.0.0.0 - 255.255.255.255 | Reserved | 💡 **Tip:** Classes D & E are reserved for special purposes like Multicast & Research! --- ## 🌍 Special IPv4 Addresses ### 🔒 Private IP Ranges - **Class A:** `10.0.0.0 - 10.255.255.255` - **Class B:** `172.16.0.0 - 172.31.255.255` - **Class C:** `192.168.0.0 - 192.168.255.255` ### 🚀 Reserved & Loopback - **Localhost:** `127.0.0.0 - 127.255.255.255` - **APIPA (Automatic Private IP Addressing):** `169.254.0.0 - 169.254.255.255` --- ## 🔄 Decimal to Binary Table | Decimal | Binary | |---------|--------| | 1 | 00000001 | | 2 | 00000010 | | 3 | 00000011 | | 4 | 00000100 | | 5 | 00000101 | | ... | ... | | 255 | 11111111 | 🤖 **Pro Tip:** Use the `ipcalc` or `subnetcalc` CLI tools to quickly convert between decimal and binary! 🛠 --- ## 🛠 Useful Tools 🔗 [Subnet Calculator](https://www.subnet-calculator.com/) 🔗 [CIDR to IP Range](https://www.ipaddressguide.com/cidr) 🔗 [Binary to Decimal Converter](https://www.rapidtables.com/convert/number/binary-to-decimal.html) --- 🔥 **Enjoy this cheat sheet? Star ⭐ the repository and share it with fellow network engineers!** 🚀