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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.166.70.0/24
network10.166.70.0/24
broadcast10.166.70.255
first host10.166.70.1
last host10.166.70.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.166.70.0/24
address00001010.10100110.01000110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100110.01000110.00000000
broadcast00001010.10100110.01000110.11111111
green = network part, grey = host part
hex0x0aa64600
decimal178669056
reverse dns0.70.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:4600

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.70.0/3010.166.70.1 – 10.166.70.210.166.70.3
210.166.70.4/3010.166.70.5 – 10.166.70.610.166.70.7
310.166.70.8/3010.166.70.9 – 10.166.70.1010.166.70.11
410.166.70.12/3010.166.70.13 – 10.166.70.1410.166.70.15
510.166.70.16/3010.166.70.17 – 10.166.70.1810.166.70.19
610.166.70.20/3010.166.70.21 – 10.166.70.2210.166.70.23
710.166.70.24/3010.166.70.25 – 10.166.70.2610.166.70.27
810.166.70.28/3010.166.70.29 – 10.166.70.3010.166.70.31
910.166.70.32/3010.166.70.33 – 10.166.70.3410.166.70.35
1010.166.70.36/3010.166.70.37 – 10.166.70.3810.166.70.39
1110.166.70.40/3010.166.70.41 – 10.166.70.4210.166.70.43
1210.166.70.44/3010.166.70.45 – 10.166.70.4610.166.70.47
1310.166.70.48/3010.166.70.49 – 10.166.70.5010.166.70.51
1410.166.70.52/3010.166.70.53 – 10.166.70.5410.166.70.55
1510.166.70.56/3010.166.70.57 – 10.166.70.5810.166.70.59
1610.166.70.60/3010.166.70.61 – 10.166.70.6210.166.70.63
1710.166.70.64/3010.166.70.65 – 10.166.70.6610.166.70.67
1810.166.70.68/3010.166.70.69 – 10.166.70.7010.166.70.71
1910.166.70.72/3010.166.70.73 – 10.166.70.7410.166.70.75
2010.166.70.76/3010.166.70.77 – 10.166.70.7810.166.70.79
2110.166.70.80/3010.166.70.81 – 10.166.70.8210.166.70.83
2210.166.70.84/3010.166.70.85 – 10.166.70.8610.166.70.87
2310.166.70.88/3010.166.70.89 – 10.166.70.9010.166.70.91
2410.166.70.92/3010.166.70.93 – 10.166.70.9410.166.70.95
2510.166.70.96/3010.166.70.97 – 10.166.70.9810.166.70.99
2610.166.70.100/3010.166.70.101 – 10.166.70.10210.166.70.103
2710.166.70.104/3010.166.70.105 – 10.166.70.10610.166.70.107
2810.166.70.108/3010.166.70.109 – 10.166.70.11010.166.70.111
2910.166.70.112/3010.166.70.113 – 10.166.70.11410.166.70.115
3010.166.70.116/3010.166.70.117 – 10.166.70.11810.166.70.119
3110.166.70.120/3010.166.70.121 – 10.166.70.12210.166.70.123
3210.166.70.124/3010.166.70.125 – 10.166.70.12610.166.70.127
3310.166.70.128/3010.166.70.129 – 10.166.70.13010.166.70.131
3410.166.70.132/3010.166.70.133 – 10.166.70.13410.166.70.135
3510.166.70.136/3010.166.70.137 – 10.166.70.13810.166.70.139
3610.166.70.140/3010.166.70.141 – 10.166.70.14210.166.70.143
3710.166.70.144/3010.166.70.145 – 10.166.70.14610.166.70.147
3810.166.70.148/3010.166.70.149 – 10.166.70.15010.166.70.151
3910.166.70.152/3010.166.70.153 – 10.166.70.15410.166.70.155
4010.166.70.156/3010.166.70.157 – 10.166.70.15810.166.70.159
4110.166.70.160/3010.166.70.161 – 10.166.70.16210.166.70.163
4210.166.70.164/3010.166.70.165 – 10.166.70.16610.166.70.167
4310.166.70.168/3010.166.70.169 – 10.166.70.17010.166.70.171
4410.166.70.172/3010.166.70.173 – 10.166.70.17410.166.70.175
4510.166.70.176/3010.166.70.177 – 10.166.70.17810.166.70.179
4610.166.70.180/3010.166.70.181 – 10.166.70.18210.166.70.183
4710.166.70.184/3010.166.70.185 – 10.166.70.18610.166.70.187
4810.166.70.188/3010.166.70.189 – 10.166.70.19010.166.70.191
4910.166.70.192/3010.166.70.193 – 10.166.70.19410.166.70.195
5010.166.70.196/3010.166.70.197 – 10.166.70.19810.166.70.199
5110.166.70.200/3010.166.70.201 – 10.166.70.20210.166.70.203
5210.166.70.204/3010.166.70.205 – 10.166.70.20610.166.70.207
5310.166.70.208/3010.166.70.209 – 10.166.70.21010.166.70.211
5410.166.70.212/3010.166.70.213 – 10.166.70.21410.166.70.215
5510.166.70.216/3010.166.70.217 – 10.166.70.21810.166.70.219
5610.166.70.220/3010.166.70.221 – 10.166.70.22210.166.70.223
5710.166.70.224/3010.166.70.225 – 10.166.70.22610.166.70.227
5810.166.70.228/3010.166.70.229 – 10.166.70.23010.166.70.231
5910.166.70.232/3010.166.70.233 – 10.166.70.23410.166.70.235
6010.166.70.236/3010.166.70.237 – 10.166.70.23810.166.70.239
6110.166.70.240/3010.166.70.241 – 10.166.70.24210.166.70.243
6210.166.70.244/3010.166.70.245 – 10.166.70.24610.166.70.247
6310.166.70.248/3010.166.70.249 – 10.166.70.25010.166.70.251
6410.166.70.252/3010.166.70.253 – 10.166.70.25410.166.70.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →