how to determine subnet mask

Internet as a distributed database that maps domain names and IP addresses to each other, making it easier for people to access the Internet without remembering the number of IP strings that can be read directly by the machine.relationship of IP address, subnet mask, gateway, DNSAn IP address that indicates your computer's identity! A subnet

dotted line. 2) perform and calculate the IP address and subnet mask. The result is the network address. 3) change the network address in the calculation result to 1, and the result is the broadcast address. 4) The address range is all hosts included in this section.The network address + 1 is the first host address, and the broadcast address-1 is the last host address.The address range is: network add

disadvantages of ipv4 have gradually been exposed, that is, the network number occupies too many places, and the number of hosts is too small, so the host addresses it provides become increasingly scarce, currently, in addition to using the reserved IP address to allocate nat addresses within an enterprise, a high-class IP address is usually divided to form multiple subnets for use by different user groups.This is mainly to effectively use the IP address in the case of network segmentation. By

The subnet mask is used to determine whether the IP addresses of any two computers belong to the same subnetwork. The simplest understanding is that after the IP address and subnet mask of the two computers perform the and operation, if the result is the same, the two compu

The Ip2long IP address is converted to an integer type.Long2ip integer data is converted to IP. The subnet mask is converted to a mask length mode:$slash _notation = strlen (Preg_replace ("/0/", "", Decbin (Ip2long ($subnet _mask)));$bits =strpos (Decbin (Ip2long ($mask)), "

Subnet Mask is the basic knowledge that each network administrator must master. Only by mastering it can you truly understand the TCP/IP protocol settings. The following describes what a subnet mask is. IP address Structure To understand what a subnet

PrefaceThis document is simply a logical algorithm, and how to compute network bits, host bits, and broadcast addresses in the case of known IP addresses and subnet masks. All steps are far from the most primitive binary way, the direct hit principle, please read carefully.1. Logic algorithmLogic and operations and logic or operations are used when computing network bits, host addresses, broadcast addresses, so it is necessary to understand their algo

We can determine whether the IP address is in the same CIDR Block through the IP address directly. The following describes how the computer uses the subnet mask to determine whether the IP addresses of two hosts are in the same CIDR block ~ How can I calculate the network ID i

IP address Structure To understand what a subnet mask is, you must understand the composition of IP addresses. The Internet is composed of many small networks, each of which has many hosts, thus forming a hierarchical structure. When designing an IP address, considering the hierarchical features of Address Allocation, each IP address is divided into two parts: the network number and the host number to faci

, infrared, etc., sometimes referred to as physical media. The MAC address is also called the physical address, hardware address, or link address, which is written by the network device manufacturer when it is produced inside the hardware. This address is not related to the network, that is, regardless of the hardware with this address (such as network cards, hubs, routers, etc.) access to the network where, it has the same MAC address, MAC address is generally immutable, can not be set by the u

Network Segment Encyclopedia business cards A cidr Block refers to the part in a computer network that uses the same physical layer device (transport medium, repeater, hub, and so on) for direct communication. From one IP address to another, it is like a network segment from 192.168.0.1 to 192.168.255.255. Network Segment The subnet mask assigned by the IP address is only 255 or 0 in each segment by defa

Reference Original address: http://www.cnblogs.com/JuneWang/p/3917697.htmlIP Address:IPv4IP address = network number + host numberSubnet Mask:A subnet mask is a basis for determining whether the IP addresses of any two computers belong to the same subnet . The simplest understanding is that the respective IP addresses of the two computers and the

second and third bytes indicate the host number in the network, which can represent a maximum of 16384 network numbers, each network can have a maximum of 66534 host numbers. 10 ******************************128-191 0-255 0-255 1-254 C: these addresses start with 110. The first, second, and third bytes indicate the network number, and the fourth byte indicate the host number in the network. There are many networks and there can be 2097152 network numbers, each network can have a maximum of 254

What is a subnet mask? The subnet mask, also known as a netmask, address mask, and subnet mask, is a way to indicate which bits of an IP address identify the host's

number. In this way, the purpose of dividing subnets is achieved. In this case Because we need to divide two subnets Then you need to expand a single bit to indicate the network number. The remaining part must be able to represent the machine number. Like this, you must ensure that there are six digits behind it. The first two digits are used to differentiate subnets. The first two and three bytes represent a subnet. XXXXXXXX. xxyyyyyy