• Subnet Mask Cheat Sheet

    Subnet Mask Cheat Sheet

    Hosts Netmask Amount of a Class C
    /30 4 255.255.255.252 1/64
    /29 8 255.255.255.248 1/32
    /28 16 255.255.255.240 1/16
    /27 32 255.255.255.224 1/8
    /26 64 255.255.255.192 1/4
    /25 128 255.255.255.128 1/2
    /24 256 255.255.255.0 1
    /23 512 255.255.254.0 2
    /22 1024 255.255.252.0 4
    /21 2048 255.255.248.0 8
    /20 4096 255.255.240.0 16
    /19 8192 255.255.224.0 32
    /18 16384 255.255.192.0 64
    /17 32768 255.255.128.0 128
    /16 65536 255.255.0.0 256

    Guide to sub-class C blocks

    /25 — 2 Subnets — 126 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.126 .127
    .128 .129-.254 .255
    		/30 — 64 Subnets — 2 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.2 .3
    .4 .5-.6 .7
    .8 .9-.10 .11
    .12 .13-.14 .15
    .16 .17-.18 .19
    .20 .21-.22 .23
    .24 .25-.26 .27
    .28 .29-.30 .31
    .32 .33-.34 .35
    .36 .37-.38 .39
    .40 .41-.42 .43
    .44 .45-.46 .47
    .48 .49-.50 .51
    .52 .53-.54 .55
    .56 .57-.58 .59
    .60 .61-.62 .63
    .64 .65-.66 .67
    .68 .69-.70 .71
    .72 .73-.74 .75
    .76 .77-.78 .79
    .80 .81-.82 .83
    .84 .85-.86 .87
    .88 .89-.90 .91
    .92 .93-.94 .95
    .96 .97-.98 .99
    .100 .101-.102 .103
    .104 .105-.106 .107
    .108 .109-.110 .111
    .112 .113-.114 .115
    .116 .117-.118 .119
    .120 .121-.122 .123
    .124 .125-.126 .127
    .128 .129-.130 .131
    .132 .133-.134 .135
    .136 .137-.138 .139
    .140 .141-.142 .143
    .144 .145-.146 .147
    .148 .149-.150 .151
    .152 .153-.154 .155
    .156 .157-.158 .159
    .160 .161-.162 .163
    .164 .165-.166 .167
    .168 .169-.170 .171
    .172 .173-.174 .175
    .176 .177-.178 .179
    .180 .181-.182 .183
    .184 .185-.186 .187
    .188 .189-.190 .191
    .192 .193-.194 .195
    .196 .197-.198 .199
    .200 .201-.202 .203
    .204 .205-.206 .207
    .208 .209-.210 .211
    .212 .213-.214 .215
    .216 .217-.218 .219
    .220 .221-.222 .223
    .224 .225-.226 .227
    .228 .229-.230 .231
    .232 .233-.234 .235
    .236 .237-.238 .239
    .240 .241-.242 .243
    .244 .245-.246 .247
    .248 .249-.250 .251
    .252 .253-.254 .255
    /26 — 4 Subnets — 62 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.62 .63
    .64 .65-.126 .127
    .128 .129-.190 .191
    .192 .193-.254 .255
    /27 — 8 Subnets — 30 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.30 .31
    .32 .33-.62 .63
    .64 .65-.94 .95
    .96 .97-.126 .127
    .128 .129-.158 .159
    .160 .161-.190 .191
    .192 .193-.222 .223
    .224 .225-.254 .255
    /28 — 16 Subnets — 14 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.14 .15
    .16 .17-.30 .31
    .32 .33-.46 .47
    .48 .49-.62 .63
    .64 .65-.78 .79
    .80 .81-.94 .95
    .96 .97-.110 .111
    .112 .113-.126 .127
    .128 .129-.142 .143
    .144 .145-.158 .159
    .160 .161-.174 .175
    .176 .177-.190 .191
    .192 .193-.206 .207
    .208 .209-.222 .223
    .224 .225-.238 .239
    .240 .241-.254 .255
    /29 — 32 Subnets — 6 Hosts/Subnet

    Network # IP Range Broadcast
    .0 .1-.6 .7
    .8 .9-.14 .15
    .16 .17-.22 .23
    .24 .25-.30 .31
    .32 .33-.38 .39
    .40 .41-.46 .47
    .48 .49-.54 .55
    .56 .57-.62 .63
    .64 .65-.70 .71
    .72 .73-.78 .79
    .80 .81-.86 .87
    .88 .89-.94 .95
    .96 .97-.102 .103
    .104 .105-.110 .111
    .112 .113-.118 .119
    .120 .121-.126 .127
    .128 .129-.134 .135
    .136 .137-.142 .143
    .144 .145-.150 .151
    .152 .153-.158 .159
    .160 .161-.166 .167
    .168 .169-.174 .175
    .176 .177-.182 .183
    .184 .185-.190 .191
    .192 .193-.198 .199
    .200 .201-.206 .207
    .208 .209-.214 .215
    .216 .217-.222 .223
    .224 .225-.230 .231
    .232 .233-.238 .239
    .240 .241-.246 .247
    .248 .249-.254 .255

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