RFC 4632 & Variable Length Subnet Masking (VLSM)
Subnet & CIDR Network Calculator
Perform instant IP address calculations, determine usable host ranges, broadcast addresses, wildcard masks, visual 32-bit binary breakdowns, and divide networks using Variable Length Subnet Masking (VLSM).
Subnet & CIDR Network Calculator
IPv4 & IPv6 VLSMInstant IP calculation, network ranges, broadcast addresses, visual binary masks, and VLSM subnet division tables.
CIDR Prefix/24
/0 (Internet)Slider: /24/32 (Single Host)
Presets:
Network Address
192.168.1.0/24
Mask: 255.255.255.0
Usable Host Range
192.168.1.1 → 192.168.1.254
254 Usable Hosts
Broadcast IP
192.168.1.255
Wildcard: 0.0.0.255
Network Scope
Private Network (RFC 1918 Class C)
Class C • 0xC0A80164
Network Properties
Subnet Mask:255.255.255.0
Wildcard Mask:0.0.0.255
CIDR Notation:/24
Total Addresses:256
Usable Hosts:254
Address Boundaries & Types
First Usable IP:192.168.1.1
Last Usable IP:192.168.1.254
Integer IP:3232235876
Hexadecimal:0xC0A80164
Address Category:Class C
Binary Bit Breakdown (32-Bit)
Network Bits (24)Host Bits (8)
IP Binary:
11000000101010000000000101100100
Mask Binary:
11111111111111111111111100000000
Subnet Divider (Subdivide into 4 subnets of /26)
Split into:
| # | Subnet (CIDR) | Usable Host Range | Broadcast | Hosts |
|---|---|---|---|---|
| 1 | 192.168.1.0/26 | 192.168.1.1 - 192.168.1.62 | 192.168.1.63 | 62 |
| 2 | 192.168.1.64/26 | 192.168.1.65 - 192.168.1.126 | 192.168.1.127 | 62 |
| 3 | 192.168.1.128/26 | 192.168.1.129 - 192.168.1.190 | 192.168.1.191 | 62 |
| 4 | 192.168.1.192/26 | 192.168.1.193 - 192.168.1.254 | 192.168.1.255 | 62 |
RFC 1918 / RFC 4632 compliant Variable Length Subnet Masking (VLSM) calculations run 100% in-browser.
Binary Bit Engine
Visual Binary Bit Analyzer
Differentiates network prefix bits from host bits in real-time across all 4 octets to clearly understand subnet masking.
VLSM Subnet Divider
Automatically split any base network into 2, 4, 8, or 16 child subnets with individual network ranges, usable hosts, and broadcast IPs.
Scope & RFC Compliance
Detects RFC 1918 Private ranges (Class A, B, C), Loopback, Link-Local, and CGNAT (RFC 6598) carrier addresses.