IP Calculator for Network Engineers: VLSM, CIDR & Binary View

Free Online IP Calculator: Convert Between Binary, Decimal & Hex

What it does

• Converts IP addresses between binary, dotted-decimal, and hexadecimal formats.
• Shows subnet mask, CIDR notation, network address, broadcast address, and usable host range.
• Calculates number of hosts per subnet and available subnets for given mask/CIDR.
• Optionally displays binary and hex for each octet and full 32-bit representation.

Key features

• Conversion modes: IPv4 binary ↔ decimal ↔ hex for individual octets and full address.
• CIDR/subnet support: Enter CIDR (e.g., /24) or subnet mask (e.g., 255.255.255.0) to get network details.
• Network calculations: Network address, broadcast address, first/last usable hosts, host count.
• Visuals: Binary/hex columns per octet and combined 32-bit view for learning and troubleshooting.
• Validation: Flags invalid addresses, classful ranges, and reserved addresses (e.g., 127.0.0.0/8).
• Export/share: Copy, download, or share results (depending on tool).

Common use cases

1. Teaching subnetting by showing decimal, binary, and hex side-by-side.
2. Converting between formats when configuring devices or reviewing logs.
3. Quickly deriving network/broadcast addresses during network design or troubleshooting.

Example (IPv4)

Input: 192.168.10.5 /24

• Decimal: 192.168.10.5
• Binary: 11000000.10101000.00001010.00000101
• Hex: C0.A8.0A.05
• Network: 192.168.10.0
• Broadcast: 192.168.10.255
• Usable hosts: 192.168.10.1 – 192.168.10.254 (254 hosts)

Tips

• Use CIDR (/n) for concise subnet definitions.
• For subnetting practice, toggle binary view to see bit-boundary changes.
• Remember IPv6 uses 128-bit representation and different conventions; many IPv4 calculators don’t support IPv6 hex the same way.

If you want, I can generate a small script or a web-form design for this calculator.