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IP Subnet Calculator

IPv4 & IPv6 | CIDR | Network Analysis

Calculate network addresses, usable host ranges, subnet masks, broadcast addresses, wildcard masks, and binary representations for any IPv4 or IPv6 subnet.

IPv4 Input

IP Address

Enter IP with or without CIDR (e.g. 10.0.0.1/24)

Subnet Mask / CIDR Prefix /1 — 128.0.0.0 /2 — 192.0.0.0 /3 — 224.0.0.0 /4 — 240.0.0.0 /5 — 248.0.0.0 /6 — 252.0.0.0 /7 — 254.0.0.0 /8 — 255.0.0.0 /9 — 255.128.0.0 /10 — 255.192.0.0 /11 — 255.224.0.0 /12 — 255.240.0.0 /13 — 255.248.0.0 /14 — 255.252.0.0 /15 — 255.254.0.0 /16 — 255.255.0.0 /17 — 255.255.128.0 /18 — 255.255.192.0 /19 — 255.255.224.0 /20 — 255.255.240.0 /21 — 255.255.248.0 /22 — 255.255.252.0 /23 — 255.255.254.0 /24 — 255.255.255.0 /25 — 255.255.255.128 /26 — 255.255.255.192 /27 — 255.255.255.224 /28 — 255.255.255.240 /29 — 255.255.255.248 /30 — 255.255.255.252 /31 — 255.255.255.254 /32 — 255.255.255.255

 Network Details

≡ Binary Representation

⚛ Subnet Split (First 8 sub-subnets if splittable)

IPv6 Input

IPv6 Address

Prefix Length

 IPv6 Network Details

 IPv4 Subnet Reference Chart

Click any row to load it into the IPv4 calculator

CIDR	Subnet Mask	Wildcard Mask	Total Hosts	Usable Hosts	Class

 About IP Subnetting

What is Subnetting?

Subnetting divides a single IP network into smaller logical sub-networks (subnets). Each subnet functions as a separate broadcast domain, improving network performance, security, and IP address management efficiency.

CIDR Notation

CIDR (Classless Inter-Domain Routing) uses a suffix to indicate how many bits represent the network portion. For example, 192.168.1.0/24 means the first 24 bits are the network, leaving 8 bits for hosts (256 addresses, 254 usable).

IPv4 Address Classes

Class A: 1.0.0.0–126.255.255.255 (/8 default)
Class B: 128.0.0.0–191.255.255.255 (/16 default)
Class C: 192.0.0.0–223.255.255.255 (/24 default)

Key Formula

Total Hosts: 2^{host bits}
Usable Hosts: 2^{host bits} − 2 (network + broadcast)
Wildcard: 255.255.255.255 − Subnet Mask

 IP Subnet Calculator  |  www.thenetworkdna.com  |  IPv4 & IPv6  |  CIDR & Subnetting