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    Subnetting Reference

    Posted on 2 mins

    Table of Contents

    Overview

    This is a copy of some of my favorite reference tables related to subnetting.

    Subnet Chart

    CIDRSubnet MaskAddressesWildcard
    /32255.255.255.25510.0.0.0
    /31255.255.255.25420.0.0.1
    /30255.255.255.25240.0.0.3
    /29255.255.255.24880.0.0.7
    /28255.255.255.240160.0.0.15
    /27255.255.255.224320.0.0.31
    /26255.255.255.192640.0.0.63
    /25255.255.255.1281280.0.0.127
    /24255.255.255.02560.0.0.255
    /23255.255.254.05120.0.1.255
    /22255.255.252.01,0240.0.3.255
    /21255.255.248.02,0480.0.7.255
    /20255.255.248.04,0960.0.15.255
    /19255.255.240.08,1920.0.31.255
    /18255.255.224.016,3840.0.63.255
    /17255.255.240.032,7680.0.127.255
    /16255.255.0.065,5360.0.255.255
    /15255.254.0.0131,0720.1.255.255
    /14255.252.0.0262,1440.3.255.255
    /13255.258.0.0524,2880.7.255.255
    /12255.240.0.01,048,5760.15.255.255
    /11255.224.0.02,097,1530.31.255.255
    /10255.192.0.04,194,3040.63.255.255
    /9255.128.0.08,388,6080.127.255.255
    /8255.0.0.016,777,2160.255.255.255
    /7254.0.0.033,554,4321.255.255.255
    /6252.0.0.067,108,8643.255.255.255
    /5248.0.0.0134,217,7287.255.255.255
    /4240.0.0.0268,435,45615.255.255.255
    /3224.0.0.0536,870,91231.255.255.255
    /2192.0.0.01,073,741,82463.255.255.255
    /1128.0.0.02,147,483,648127.255.255.255
    /00.0.0.04,294,967,296255.255.255.255

    Decimal To Binary

    Subnet MaskWild Card
    2551111 111100000 0000
    2541111 111010000 0001
    2521111 110030000 0011
    2481111 100070000 0111
    2401111 1111150000 1111
    2241111 1111310001 1111
    1921111 1111630011 1111
    1281111 11111270111 1111
    2551111 11112551111 1111

    Subnet Proportion

    %%{ init: { 'theme': 'forest', } }%% pie "/25" : 256 "/26" : 64 "/27" : 32 "/28" : 16 "/29" : 8 "/30" : 4

    Classful Ranges

    A0.0.0.0 - 127.255.255.255
    B128.0.0.0 - 191.255.255.255
    C192.0.0.0 - 223.255.255.255
    D224.0.0.0 - 239.255.255.255
    E240.0.0.0 - 255.255.255.255

    Reserved Ranges

    RFC191810.0.0.0 - 10.255.255.255
    Localhost127.0.0.0 - 127.255.255.255
    RFC1918172.16.0.0 - 172.31.255.255
    RFC1918192.168.0.0 - 192.168.255.255