ip段/數字，如192.168.0.1/24的意思是什么？
踩踩 作者：Admin 發表日期：2013-10-31 復制鏈接 收藏
首先來了解一下二進制的轉換知識：
二進制數轉換成十進制數 二進制的1101轉化成十進制
1101（2）=1*2^0+0*2^1+1*2^2+1*2^3=1+0+4+8=13
轉化成十進制要從右到左用二進制的每個數去乘以2的相應次方
不過次方要從0開始
相反 用十進制的13除以2 每除一下將余數就記在旁邊
最后按余數從下向上排列就可得到1101
十進制轉二進制：
用2輾轉相除至結果為1
將余數和最后的1從下向上倒序寫 就是結果
例如302
302/2 = 151 余0
151/2 = 75 余1
75/2 = 37 余1
37/2 = 18 余1
18/2 = 9 余0
9/2 = 4 余1
4/2 = 2 余0
2/2 = 1 余0
1/2 = 0 余1
故二進制為100101110
子網掩碼的前綴表示法！ [/pre][pre]11111111 11111111 1111111 00000000 24個1組成 [/pre][pre]轉成成十進制等於 255.255.255.0 [/pre][pre]11111111 11111111 1111111 11111100 30個1組成 [/pre][pre]轉成成十進制等於 255.255.255.252 [/pre] 我們租用服務器/vps的時候，買多個IP地址，機房總是發一個類似 10.0.0.1/29 或 10.0.0.1/28 或 10.0.0.1/30 或 10.0.0.1/27 的地址給我們，對於不熟悉網絡的人來說，真的莫名其妙。到底有哪些可用的IP？ 網關,子網掩碼，廣播地址是什么？
為了方便大家，本文章提供了 可用IP查詢，ip段/27 /29 /30 網關,子網掩碼，廣播地址查詢
可用IP查詢,IP段對應表
IP總數子網掩碼C段個數/30/29/28/27/26/24/23/22/21/20/19/18/17/16
| 4 |
255.255.255.252 |
1/64 |
| 8 |
255.255.255.248 |
1/32 |
| 16 |
255.255.255.240 |
1/16 |
| 32 |
255.255.255.224 |
1/8 |
| 64 |
255.255.255.192 |
1/4 |
| 256 |
255.255.255.0 |
1 |
| 512 |
255.255.254.0 |
2 |
| 1024 |
255.255.252.0 |
4 |
| 2048 |
255.255.248.0 |
8 |
| 4096 |
255.255.240.0 |
16 |
| 8192 |
255.255.224.0 |
32 |
| 16384 |
255.255.192.0 |
64 |
| 32768 |
255.255.128.0 |
128 |
| 65536 |
255.255.0.0 |
256 |
ip段/24 /25 /26 /27 /28 /29 /30
網關,子網掩碼，廣播地址查詢
范例： 要查詢204.45.116.184/29，先找到下表的 /29 表格，網關 這一列找到要查詢的IP最后一位即.184，然后就可以看到可用IP范圍（注:第一個IP是Gateway網關地址）和廣播地址了。然后從上面的表找到 子網掩碼即可。
/25 -- 2 Subnets -- 126 Hosts/Subnet
網絡地址可用IP范圍廣播地址
| .0 |
.1-.126 |
.127 |
| .128 |
.129-.254 |
.255 |
|
/24 --1 Subnets -- 254 Hosts/Subnet
代表一整個C段
網絡地址可用IP范圍廣播地址
/30 -- 64 Subnets -- 2 Hosts/Subnet
網絡地址可用IP范圍廣播地址
| .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
網絡地址可用IP范圍廣播地址
| .0 |
.1-.62 |
.63 |
| .64 |
.65-.126 |
.127 |
| .128 |
.129-.190 |
.191 |
| .192 |
.193-.254 |
.255 |
|
/27 -- 8 Subnets -- 30 Hosts/Subnet
網絡地址可用IP范圍廣播地址
| .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
網絡地址可用IP范圍廣播地址
| .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
網絡地址可用IP范圍廣播地址
| .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 |
|
