IT PARK
    Most Popular

    The difference between nfc and Bluetooth

    May 27, 2025

    What is Data Governance? Why do organizations need to do data governance?

    May 21, 2025

    Do you know what 3D Mapping is?

    May 20, 2025

    IT PARK IT PARK

    • Home
    • Encyclopedia

      How often should the router be turned off?

      Jul 02, 2025

      What is a port?

      Jul 01, 2025

      What to do with a laptop blue screen

      Jun 30, 2025

      Is it better to save the file as a zip archive or as the original file?

      Jun 29, 2025

      What is cross-site scripting attack

      Jun 28, 2025
    • AI

      When AI starts to have "subconsciousness"

      Jul 02, 2025

      Can AI Painting Replace Human Painters

      Jul 01, 2025

      Who owns the copyright of the paintings created by AI for you?

      Jun 30, 2025

      How does the meta universe "feed" artificial intelligence models?

      Jun 29, 2025

      Amazon Bedrock: How to Stay Competitive in Generative AI

      Jun 28, 2025
    • Big Data

      What is the maximum value of big data

      Jul 02, 2025

      Transforming the construction industry through digital twin modeling

      Jul 01, 2025

      How does big data start? From small data to big data

      Jun 30, 2025

      What is big data? What can big data do?

      Jun 29, 2025

      Benefits of big data analysis and how to analyze big data

      Jun 28, 2025
    • CLO

      What does cloud platform mean?

      Jul 02, 2025

      Essential factors to consider for a successful cloud transformation journey

      Jul 01, 2025

      Building a Smart City: The Importance of Cloud Storage

      Jun 30, 2025

      SaaS sprawl: meaning, hazard, status quo and mitigation plan

      Jun 29, 2025

      What are the advantages and disadvantages of hybrid cloud?

      Jun 28, 2025
    • IoT

      Why the Metaverse Matters for the Future of Manufacturing

      Jul 02, 2025

      6 Ways the Internet of Things is Transforming Agriculture

      Jul 01, 2025

      4 Big Challenges for IoT Data Collection and Management

      Jun 30, 2025

      Most enterprises expect a return on investment within one year of IoT deployment

      Jun 29, 2025

      What are the main applications of IoT in our real life?

      Jun 28, 2025
    • Blockchain

      What is Bitcoin?

      Jul 02, 2025

      Blockchain Common Consensus Mechanisms

      Jul 01, 2025

      How energy company Powerledger (POWR) is using blockchain to improve the world

      Jun 30, 2025

      Ten application scenarios for blockchain

      Jun 29, 2025

      What is a privacy coin? What is the difference between them and Bitcoin?

      Jun 28, 2025
    IT PARK
    Home » Encyclopedia » What is the subnet mask
    Encyclopedia

    What is the subnet mask

    Subnet mask is also called network mask, address mask and subnet mask. It is used to indicate which bits of an IP address identify the subnet where the host is located and which bits identify the bit mask of the host. The subnet mask cannot exist alone. It must be used in combination with the IP address. The subnet mask has only one function, which is to divide an IP address into two parts: network address and host address. The subnet mask is the basic knowledge that everyone who uses the Internet must master. Only by mastering it can you truly understand the TCP/IP protocol settings. Let's explain what subnet mask is in simple terms.
    Updated: May 25, 2025
    What is the subnet mask

    Subnet mask is also called network mask, address mask and subnet mask. It is used to indicate which bits of an IP address identify the subnet where the host is located and which bits identify the bit mask of the host. The subnet mask cannot exist alone. It must be used in combination with the IP address. The subnet mask has only one function, which is to divide an IP address into two parts: network address and host address. The subnet mask is the basic knowledge that everyone who uses the Internet must master. Only by mastering it can you truly understand the TCP/IP protocol settings. Let's explain what subnet mask is in simple terms.

    How to divide the subnet? First, you must memorize the power of 2: the values from the 0th power to the 9th power of 2 are: 1, 2, 4, 8, 16, 32, 64, 128, 256, and 512. Another thing to understand is: subnetting is based on taking away the host bit, and using this taken away part as the subnet bit. So this means that the more subnets there are, the fewer hosts there will be.

    The subnet mask is used to distinguish which part of the IP address is the network address and which part is the host address. It consists of 1 and 0, 32 bits long, and all 1 bits represent the network number. Not all networks require subnets. Therefore, a concept is introduced: default subnet mask. The default subnet mask of class A IP address is 255.0.0.0; that of class B is 255.255.0.0; and that of class C is 255.255.255.0.

    CIDR is called classless inter-domain routing. ISPs often use this method to assign addresses to customers. ISPs provide customers with a block size (block size), similar to this: 192.168.10.32/28, this row of numbers tells you your subnet mask How much is it, /28 represents how many bits are 1, and the maximum is /32. But you must know that: no matter it is a class A, class B or other class address, the maximum available address can only be /30, that is, 2 bits are reserved for the host bit.

    Several shortcuts for subnetting:

     

    1. How many subnets will be generated by the subnet mask you choose?: 2 to the power of x-2 (x represents the subnet bit, that is, the part whose binary system is 1) PS: here x means to exclude the default The subnet bits after the mask, for example, the network address 192.168.1.1, the mask 255.255.255.192, because it is a class C address, the mask is 255.255.255.0. Then 255.255.255.192(x.x.x.11000000) uses two 1s as subnet bits.

     

    1. How many hosts can each subnet have?: 2 to the power of y-2 (y represents the host bit, that is, the part whose binary system is 0)

     

    1. What is the effective subnet?: Effective subnet number = 256-decimal subnet mask (the result is called block size or base number)

     

    1. What is the broadcast address of each subnet?: Broadcast address = next subnet number - 1

     

    1. What are the effective hosts of each subnet?: Ignore the addresses of all 0s and all 1s in the subnet, and the remaining ones are valid host addresses.

     

    The last valid host address = the next subnet number - 2 (that is, the broadcast address - 1)

    encyclopedias subnet mask computer network
    Previous Article Lifting the veil of mystery on voice-activated technology
    Next Article Why does Web3 need digital identity?

    Related Articles

    Encyclopedia

    What are the advantages of full frame SLR camera

    Jun 08, 2025
    Encyclopedia

    What are the benefits of using SSD in laptops

    Jun 09, 2025
    Encyclopedia

    Differences between SSDs and HDDs

    May 24, 2025
    Most Popular

    The difference between nfc and Bluetooth

    May 27, 2025

    What is Data Governance? Why do organizations need to do data governance?

    May 21, 2025

    Do you know what 3D Mapping is?

    May 20, 2025
    Copyright © 2025 itheroe.com. All rights reserved. User Agreement | Privacy Policy

    Type above and press Enter to search. Press Esc to cancel.