IP Subnet Calculator
Input Parameters
.
.
.
⚠ Please enter a valid IPv4 address (each octet 0–255) and choose a subnet prefix.
📌 Private Address Ranges
Class A Private10.0.0.0/8
Class B Private172.16.0.0/12
Class C Private192.168.0.0/16
Loopback127.0.0.0/8
Link-Local169.254.0.0/16
Multicast224.0.0.0/4
Enter an IP address and subnet prefix on the left, then click Calculate.
📋 Core Network Information
👥 Host & Address Count
🔍 IP Classification & Details
💻 Binary Representation
| Field | Decimal | Binary ■ Network ■ Host |
🗂 Adjacent Subnet Blocks
| # | Network / CIDR | First Usable | Last Usable | Broadcast | Hosts |
|---|
📖 IPv4 Address Class Reference
| Class | Leading Bits | Address Range | Default Mask | Max Hosts/Net | Purpose |
|---|---|---|---|---|---|
| Class A | 0xxx | 1.0.0.0 – 126.255.255.255 | /8 | 16,777,214 | Large enterprises |
| Class B | 10xx | 128.0.0.0 – 191.255.255.255 | /16 | 65,534 | Medium networks |
| Class C | 110x | 192.0.0.0 – 223.255.255.255 | /24 | 254 | Small / ISP networks |
| Class D | 1110 | 224.0.0.0 – 239.255.255.255 | N/A | N/A | Multicast groups |
| Class E | 1111 | 240.0.0.0 – 255.255.255.255 | N/A | N/A | Research / Reserved |
| Loopback | 0111 1111 | 127.0.0.0 – 127.255.255.255 | /8 | N/A | Local host testing |
🔒 Special & Private Ranges (RFC 1918)
| Range | CIDR | Scope | RFC |
|---|---|---|---|
| 10.0.0.0 – 10.255.255.255 | /8 | Private (Class A) | RFC 1918 |
| 172.16.0.0 – 172.31.255.255 | /12 | Private (Class B) | RFC 1918 |
| 192.168.0.0 – 192.168.255.255 | /16 | Private (Class C) | RFC 1918 |
| 169.254.0.0 – 169.254.255.255 | /16 | Link-Local (APIPA) | RFC 3927 |
| 127.0.0.0 – 127.255.255.255 | /8 | Loopback | RFC 5735 |
| 224.0.0.0 – 239.255.255.255 | /4 | Multicast | RFC 5771 |
| 255.255.255.255 | /32 | Limited Broadcast | RFC 919 |
