IPv4 Subnet Wizard Quiz

Input an IPv4 address and CIDR bits randomize

IP Address

CIDR

Subnet Mask

Expand sections by clicking the colored tabs; reveal answers by clicking grey boxes

Binary Bitstream

An octet is a group of 8 bits (also known as a byte). IP addresses can be converted to their constituent bits in a binary bitsteam (below) with dots between octets. Classy Network bits are highlighted in blue; Subnet bits borrowed (if any) are highlighted in green; Host ID bits are highlighted in gold.

IP Addressin binary, first four bits determine legacy class

Subnet Maskif no green bits shown, subnet is aligned with legacy class or is a supernet

Network ID copy the Network bits and Subnet bits (if any) bits from IP Address above, then fill Host bits with zero

Broadcast Address (binary)copy Network ID (above) but fill Host bits with ones; this is used for directed broadcasts

This Subnet

Network ID a.k.a. Network/Subnet Address, this is the lowest possible IP address within subnet range

First Usable Host Address one IP higher than Network ID

Last Usable Host Address one IP lower than Broadcast Address

Broadcast Address this is the highest possible IP address within subnet range (cannot be used for hosts)

Next Subnet

Next Subnet's Network ID lowest possible IP address within the next subnet following current subnet

Next Subnet's First Usable Host Address one IP higher than Next Subnet's Network ID

Next Subnet's Last Usable Host Address one IP lower than Next Subnet's Broadcast Address

Next Subnet's Broadcast Address highest possible IP address within next subnet following current subnet

IP Address Info

Legacy Class

Classy Bits

Address Type

Subnet Info

Number of Subnets

Usable Hosts Per Subnet

Obscure Info

Wildcard (Inverted) Mask

IPv4 in Decimal

IPv4 in Hexadecimal

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IPv4 Subnet Wizard Quiz