Self-Contained IP Subnet Calculator
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IPv4 Calculator
IPv6 Calculator
IPv4 Subnet Information
Network Address
192.168.1.0
Broadcast Address
192.168.1.255
Usable Host Range
192.168.1.1 – 192.168.1.254
Total Hosts
254
CIDR Notation
192.168.1.0/24
IP Class
Class C
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
IPv6 Subnet Information
Network Address
2001:db8:85a3::
First Usable Address
2001:db8:85a3::1
Last Usable Address
2001:db8:85a3:0:ffff:ffff:ffff:fffe
Total IP Addresses
18,446,744,073,709,551,616
Prefix Length
/64
Expanded Address
2001:0db8:85a3:0000:0000:8a2e:0370:7334
Compressed Address
2001:db8:85a3::8a2e:370:7334
Subnet Mask
ffff:ffff:ffff:ffff::
Subnetting Reference
What is Subnetting?
Subnetting is the process of dividing a large network into smaller, more manageable sub-networks (subnets). This improves network performance, security, and organization by reducing broadcast domains and improving IP allocation efficiency.
IPv4 vs IPv6
- IPv4: 32-bit address space (4.3 billion addresses), uses subnet masks
- IPv6: 128-bit address space (340 undecillion addresses), uses prefix lengths
- IPv6 eliminates the need for NAT and provides built-in security
- IPv6 has simplified address assignment and auto-configuration
Common IPv4 Subnet Masks
| CIDR | Subnet Mask | Hosts | Use Case |
|---|---|---|---|
| /24 | 255.255.255.0 | 254 | Small networks |
| /25 | 255.255.255.128 | 126 | Medium networks |
| /26 | 255.255.255.192 | 62 | Department networks |
| /27 | 255.255.255.224 | 30 | Small offices |
| /28 | 255.255.255.240 | 14 | Server clusters |
| /30 | 255.255.255.252 | 2 | Point-to-point links |
Advanced Subnetting Techniques
- VLSM (Variable Length Subnet Masking): Allows different subnet masks in the same network for efficient address allocation
- CIDR (Classless Inter-Domain Routing): Aggregates multiple IP networks into a single routing entry to reduce routing table sizes
- Supernetting: Combining multiple contiguous networks into a larger network
- IPv6 Prefix Delegation: Automatically assigns network prefixes to customer sites
- Hierarchical Addressing: Creates multiple levels of subnet hierarchy for large organizations
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