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Daryl's TCP/IP Primer
LAN Administrator's Guide to TCP/IP and routing for Internet-connected LANs.
Provides a complete listing of all routable IPv4 IP addresses, geolocation information as well as registration information.
IP Address Subnetting Tutorial
A technical introduction to IP addressing and address subnetting in an easy-to-understand tutorial format.
A Cisco document explaining what IP addresses are. [HTML/PDF]
IP exercises to practise all kinds of IP notations, calculations and subnetting challenges.
IP subnetting exerciser
This site automatically generates and reviews an endless list of exercises on IP subnetting, starting from different presets.
A subnet mask and network/node calculator including IP address and mask conversion.
Online IP Subnet Calculator
Online IP subnet, CIDR/VLSM/supernet and wildcard mask calculators.
Subnet Calculator Ninja
Powerful IP subnet calculator that supports IPv4 and IPv6 addresses. Includes detailed explanation about the different IP types
Online IP subnet calculators, subnetting tutorials and online network tools for IPv4 and IPv6.
Teaches IT students and networking professionals how IP addressing works. Lessons include easy subnetting, subnet mask calculation, binary math and VLSM.
Subnetting practice site. Practice and calculaters for IPv4, IPv6, VLSM, CIDR, Binary, Hex.
A detailed article about subnetting from the free encyclopedia.