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The address format of IPv4 is represented into 4-octets (32-bit), which is divided into three different classes, namely class A, class B, and class C. The above diagram shows the address format of IPv4.
One approach is to use NetworkInterface.getNetworkInterfaces() to get all of the known network interfaces on the host, and then iterate over each NI's addresses. Another approach is to (somehow) get the externally advertized FQDN for the host, and use InetAddress.getByName() to look up the primary IP address.
Java library for handling IP addresses and subnets, both IPv4 and IPv6. IP address and network manipulations, CIDR, address and subnet operations, iterations, containment checks, longest prefix match, subnetting, and address and subnet data structures including address tries, with polymorphic code. View Project Page. View Code Examples. View ...
Figure 4: Principle Classful IP Address Formats One of the fundamental features of classful IP addressing is that each address contains a self-encoding key that identifies the dividing point between the network-prefix and the host-number. For example, if the first two bits of an IP address are 1-0, the dividing
Figure 30-4 IP address formats A, B, and C are available for commercial use. The class of address can be determined easily by examining the first octet of the address and mapping that value to a class range in the following table.
Chapter 04 Networking Basics. Contents: 4.1 Basics Socket overview, client/server, reserved sockets, proxy servers, internet addressing. 4.2 Java & the Net: The networking classes & interfaces. 4.3 InetAddress class: Factory methods, instance method. 4.4 TCP/IP Client Sockets, 4.5 TCP/IP Server Sockets.
Every IP address must be accompanied by a subnet mask. By now you should be able to look at an IP address and tell what class it is. Unfortunately your computer doesn’t think that way. For your computer to determine the network and subnet portion of an IP address it must “AND” the IP address with the subnet mask. Default Subnet Masks:
