June 2018
Intermediate to advanced
294 pages
7h 5m
English
Content preview from Practical Web Penetration Testing
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Network subnets
Sometimes, you will be given subnet masks (a range of IP addresses) to test, and in some cases, you will test only one single IP address. If you're using a subnet mask, then use the following table as a reference:
| CIDR | Hosts | Net mask |
| /30 | 2 | 255.255.255.252 |
| /29 | 6 | 255.255.255.248 |
| /28 | 14 | 255.255.255.240 |
| /27 | 30 | 255.255.255.224 |
| /26 | 62 | 255.255.255.192 |
| /25 | 126 | 255.255.255.128 |
| /24 | 254 | 255.255.255.0 |
| /23 | 510 | 255.255.254.0 |
| /22 | 1022 | 255.255.252.0 |
| /21 | 2046 | 255.255.248.0 |
| /20 | 4094 | 255.255.240.0 |
| /19 | 8190 | 255.255.224.0 |
| /18 | 16382 | 255.255.192.0 |
| /17 | 32766 | 255.255.128.0 |
| /16 | 65534 | 255.255.0.0 |
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