https://www.aelius.com/njh/subnet_sheet.html
See also RFC 1878.
| Addresses | Hosts | Netmask | Amount of a Class C |
---|
/30 | 4 | 2 | 255.255.255.252 | 1/64 |
---|
/29 | 8 | 6 | 255.255.255.248 | 1/32 |
---|
/28 | 16 | 14 | 255.255.255.240 | 1/16 |
---|
/27 | 32 | 30 | 255.255.255.224 | 1/8 |
---|
/26 | 64 | 62 | 255.255.255.192 | 1/4 |
---|
/25 | 128 | 126 | 255.255.255.128 | 1/2 |
---|
/24 | 256 | 254 | 255.255.255.0 | 1 |
---|
/23 | 512 | 510 | 255.255.254.0 | 2 |
---|
/22 | 1024 | 1022 | 255.255.252.0 | 4 |
---|
/21 | 2048 | 2046 | 255.255.248.0 | 8 |
---|
/20 | 4096 | 4094 | 255.255.240.0 | 16 |
---|
/19 | 8192 | 8190 | 255.255.224.0 | 32 |
---|
/18 | 16384 | 16382 | 255.255.192.0 | 64 |
---|
/17 | 32768 | 32766 | 255.255.128.0 | 128 |
---|
/16 | 65536 | 65534 | 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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