This tool can be used to calculate subnet address ranges. You quickly and easily see how many total and usable IPv4 addresses are in the range you specify.
The below tables can also be used to quickly reference IPv4 or IPv6 subnet information.
Address Range:
Mask:
Total:
Usable:
CIDR:
Quick reference cheat sheet for daily subnetting tasks.
You can use the IPv4 chart for IP address planning and to convert subnet masks to CIDR and wildcards.
CIDR | Subnet | # IP Addresses | # Usable IP Addresses | Wildcard |
---|---|---|---|---|
/32 | 255.255.255.255 | 1 | 1 | 0.0.0.0 |
/31 | 255.255.255.254 | 2 | 2 (See RFC 3021) | 0.0.0.1 |
/30 | 255.255.255.252 | 4 | 2 | 0.0.0.3 |
/29 | 255.255.255.248 | 8 | 6 | 0.0.0.7 |
/28 | 255.255.255.240 | 16 | 14 | 0.0.0.15 |
/27 | 255.255.255.224 | 32 | 30 | 0.0.0.31 |
/26 | 255.255.255.192 | 64 | 62 | 0.0.0.63 |
/25 | 255.255.255.128 | 128 | 126 | 0.0.0.127 |
/24 | 255.255.255.0 | 256 | 254 | 0.0.0.255 |
/23 | 255.255.254.0 | 512 | 510 | 0.0.1.255 |
/22 | 255.255.252.0 | 1024 | 1022 | 0.0.3.255 |
/21 | 255.255.248.0 | 2048 | 2046 | 0.0.7.255 |
/20 | 255.255.240.0 | 4096 | 4094 | 0.0.15.255 |
/19 | 255.255.224.0 | 8192 | 8190 | 0.0.31.255 |
/18 | 255.255.192.0 | 16,384 | 16,382 | 0.0.63.255 |
/17 | 255.255.128.0 | 32,768 | 32,766 | 0.0.127.255 |
/16 | 255.255.0.0 | 65,536 | 65,534 | 0.0.255.255 |
/15 | 255.254.0.0 | 131,072 | 131,070 | 0.1.255.255 |
/14 | 255.252.0.0 | 262,144 | 262,142 | 0.3.255.255 |
/13 | 255.248.0.0 | 524,288 | 524,286 | 0.7.255.255 |
/12 | 255.240.0.0 | 1,048,576 | 1,048,574 | 0.15.255.255 |
/11 | 255.224.0.0 | 2,097,152 | 2,097,150 | 0.31.255.255 |
/10 | 255.192.0.0 | 4,194,304 | 4,194,302 | 0.63.255.255 |
/9 | 255.128.0.0 | 8,388,608 | 8,388,606 | 0.127.255.255 |
/8 | 255.0.0.0 | 16,777,216 | 16,777,214 | 0.255.255.255 |
/7 | 254.0.0.0 | 33,554,432 | 33,554,430 | 0.1.255.255 |
/6 | 252.0.0.0 | 67,108,864 | 67,108,862 | 0.3.255.255 |
/5 | 248.0.0.0 | 134,217,728 | 134,217,726 | 0.7.255.255 |
/4 | 240.0.0.0 | 268,435,456 | 268,435,454 | 0.15.255.255 |
/3 | 224.0.0.0 | 536,870,912 | 536,870,910 | 0.31.255.255 |
/2 | 192.0.0.0 | 1,073,741,824 | 1,073,741,822 | 0.63.255.255 |
/1 | 128.0.0.0 | 2,147,483,648 | 2,147,483,646 | 0.127.255.255 |
/0 | 0.0.0.0 | 4,294,967,296 | 4,294,967,294 | 0.255.255.255 |
Prefix | Subnet Examples | Total IP Addresses | Number of /64 |
---|---|---|---|
4 | x:: | 2 124 | 2 60 |
8 | xx:: | 2 120 | 2 56 |
12 | xxx:: | 2 116 | 2 52 |
16 | xxxx:: | 2 112 | 2 48 |
20 | xxxx:x:: | 2 108 | 2 44 |
24 | xxxx:xx:: | 2 104 | 2 40 |
28 | xxxx:xxx:: | 2 100 | 2 36 |
32 | xxxx:xxxx:: | 2 96 | 4,294,967,296 |
36 | xxxx:xxxx:x:: | 2 92 | 268,435,456 |
40 | xxxx:xxxx:xx:: | 2 88 | 16,777,216 |
44 | xxxx:xxxx:xxx:: | 2 84 | 1,048,576 |
48 | xxxx:xxxx:xxxx:: | 2 80 | 65,536 |
52 | xxxx:xxxx:xxxx:x:: | 2 76 | 4,096 |
56 | xxxx:xxxx:xxxx:xx:: | 2 72 | 256 |
60 | xxxx:xxxx:xxxx:xxx:: | 2 68 | 16 |
64 | xxxx:xxxx:xxxx:xxxx:: | 2 64 (18,446,744,073,709,551,616) | 1 |
68 | xxxx:xxxx:xxxx:xxxx:x:: | 2 60 (1,152,921,504,606,846,976) | 0 |
72 | xxxx:xxxx:xxxx:xxxx:xx:: | 2 56 (72,057,594,037,927,936) | 0 |
76 | xxxx:xxxx:xxxx:xxxx:xxx:: | 2 52 (4,503,599,627,370,496) | 0 |
80 | xxxx:xxxx:xxxx:xxxx:xxxx:: | 2 48 (281,474,976,710,656) | 0 |
84 | xxxx:xxxx:xxxx:xxxx:xxxx:x:: | 2 44 (17,592,186,044,416) | 0 |
88 | xxxx:xxxx:xxxx:xxxx:xxxx:xx:: | 2 40 (1,099,511,627,776) | 0 |
92 | xxxx:xxxx:xxxx:xxxx:xxxx:xxx:: | 2 36 (68,719,476,736) | 0 |
96 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:: | 2 32 (4,294,967,296) | 0 |
100 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:x:: | 2 28 (268,435,456) | 0 |
104 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xx:: | 2 24 (16,777,216) | 0 |
108 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxx:: | 2 20 (1,048,576) | 0 |
112 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:: | 2 16 (65,536) | 0 |
116 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:x:: | 2 12 (4,096) | 0 |
120 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xx:: | 2 8 (256) | 0 |
124 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxx:: | 2 4 (16) | 0 |
128 | xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx | 2 0 (1) | 0 |