IPv4 Address Scheme Calculator

About this interactive

An IPv4 corporate network uses a private range inside and translates to the ISP's public addresses at the edge. Of the three private ranges, 10.0.0.0/8 leaves the most room, 24 bits. A less common part of it also avoids clashing with a home network or a merged company's network: when two networks joined by a VPN use the same addresses, traffic cannot be routed to the right one. Splitting by octets and nibbles keeps a scheme readable. One layout makes the second octet the region and splits the third octet between the site and the hosts. Size the host field from the hosts the biggest site needs, plus the network and broadcast addresses, then round up to a whole nibble: 600 hosts need 10 bits, and the scheme gives 12, so each site is a /20 and 10.8.64.0 is region 8, site 4. Links between regions belong to no one region, so they get region 0. Seven of the twenty-two questions are drawn each run. Anything you miss shows the answer and how to work it out.

What you'll learn

Size a site's host field to a whole nibble and work out the network, broadcast, region and site of any address in an octet- and nibble-based 10.0.0.0/8 scheme
Compare the room the three private IPv4 ranges leave, and count the addresses two ranges share when networks are joined by a VPN or a merger

Aligned to

CompTIA Network+

1.7 Given a scenario, use appropriate IPv4 network addressing

Cisco CCST Networking

2.2 Identify IPv4 addresses and subnet formats

2.1 Compare and contrast private addresses and public addresses

Cisco CCNA

1.7 Describe private IPv4 addressing

Key terms

Private IPv4 Address Range: A set of IP address ranges reserved for internal network use that are not routable on the public internet, including 10.0.0.0/8, 172.16.0.0–172.31.255.255, and 192.168.0.0/16.
Hierarchical Subnetting: A structured approach to dividing an IP address space into levels such as regions and sites to reflect an organization's topology.
Octet: One of the four 8-bit sections of an IPv4 address, each separated by a dot in dotted decimal notation and representing a decimal value from 0 to 255. For example, in 192.168.1.1, the four octets are 192, 168, 1, and 1.
Nibble Boundary: A subnetting division point aligned to a 4-bit (one hexadecimal digit) boundary in an IPv6 address, simplifying hierarchical address allocation.
Virtual Private Network: A technology that creates a secure, encrypted tunnel over a public network to protect data in transit.

Topics

Ipv4 Address Planning Private Ipv4 Hierarchical Subnetting Ip Overlap Interactive Calculation

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