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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)10.70.4.0/24
network10.70.4.0/24
broadcast10.70.4.255
first host10.70.4.1
last host10.70.4.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.70.4.0/24
address00001010.01000110.00000100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000110.00000100.00000000
broadcast00001010.01000110.00000100.11111111
green = network part, grey = host part
hex0x0a460400
decimal172360704
reverse dns0.4.70.10.in-addr.arpa
ipv4-mapped::ffff:a46:400

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.70.4.0/3010.70.4.1 – 10.70.4.210.70.4.3
210.70.4.4/3010.70.4.5 – 10.70.4.610.70.4.7
310.70.4.8/3010.70.4.9 – 10.70.4.1010.70.4.11
410.70.4.12/3010.70.4.13 – 10.70.4.1410.70.4.15
510.70.4.16/3010.70.4.17 – 10.70.4.1810.70.4.19
610.70.4.20/3010.70.4.21 – 10.70.4.2210.70.4.23
710.70.4.24/3010.70.4.25 – 10.70.4.2610.70.4.27
810.70.4.28/3010.70.4.29 – 10.70.4.3010.70.4.31
910.70.4.32/3010.70.4.33 – 10.70.4.3410.70.4.35
1010.70.4.36/3010.70.4.37 – 10.70.4.3810.70.4.39
1110.70.4.40/3010.70.4.41 – 10.70.4.4210.70.4.43
1210.70.4.44/3010.70.4.45 – 10.70.4.4610.70.4.47
1310.70.4.48/3010.70.4.49 – 10.70.4.5010.70.4.51
1410.70.4.52/3010.70.4.53 – 10.70.4.5410.70.4.55
1510.70.4.56/3010.70.4.57 – 10.70.4.5810.70.4.59
1610.70.4.60/3010.70.4.61 – 10.70.4.6210.70.4.63
1710.70.4.64/3010.70.4.65 – 10.70.4.6610.70.4.67
1810.70.4.68/3010.70.4.69 – 10.70.4.7010.70.4.71
1910.70.4.72/3010.70.4.73 – 10.70.4.7410.70.4.75
2010.70.4.76/3010.70.4.77 – 10.70.4.7810.70.4.79
2110.70.4.80/3010.70.4.81 – 10.70.4.8210.70.4.83
2210.70.4.84/3010.70.4.85 – 10.70.4.8610.70.4.87
2310.70.4.88/3010.70.4.89 – 10.70.4.9010.70.4.91
2410.70.4.92/3010.70.4.93 – 10.70.4.9410.70.4.95
2510.70.4.96/3010.70.4.97 – 10.70.4.9810.70.4.99
2610.70.4.100/3010.70.4.101 – 10.70.4.10210.70.4.103
2710.70.4.104/3010.70.4.105 – 10.70.4.10610.70.4.107
2810.70.4.108/3010.70.4.109 – 10.70.4.11010.70.4.111
2910.70.4.112/3010.70.4.113 – 10.70.4.11410.70.4.115
3010.70.4.116/3010.70.4.117 – 10.70.4.11810.70.4.119
3110.70.4.120/3010.70.4.121 – 10.70.4.12210.70.4.123
3210.70.4.124/3010.70.4.125 – 10.70.4.12610.70.4.127
3310.70.4.128/3010.70.4.129 – 10.70.4.13010.70.4.131
3410.70.4.132/3010.70.4.133 – 10.70.4.13410.70.4.135
3510.70.4.136/3010.70.4.137 – 10.70.4.13810.70.4.139
3610.70.4.140/3010.70.4.141 – 10.70.4.14210.70.4.143
3710.70.4.144/3010.70.4.145 – 10.70.4.14610.70.4.147
3810.70.4.148/3010.70.4.149 – 10.70.4.15010.70.4.151
3910.70.4.152/3010.70.4.153 – 10.70.4.15410.70.4.155
4010.70.4.156/3010.70.4.157 – 10.70.4.15810.70.4.159
4110.70.4.160/3010.70.4.161 – 10.70.4.16210.70.4.163
4210.70.4.164/3010.70.4.165 – 10.70.4.16610.70.4.167
4310.70.4.168/3010.70.4.169 – 10.70.4.17010.70.4.171
4410.70.4.172/3010.70.4.173 – 10.70.4.17410.70.4.175
4510.70.4.176/3010.70.4.177 – 10.70.4.17810.70.4.179
4610.70.4.180/3010.70.4.181 – 10.70.4.18210.70.4.183
4710.70.4.184/3010.70.4.185 – 10.70.4.18610.70.4.187
4810.70.4.188/3010.70.4.189 – 10.70.4.19010.70.4.191
4910.70.4.192/3010.70.4.193 – 10.70.4.19410.70.4.195
5010.70.4.196/3010.70.4.197 – 10.70.4.19810.70.4.199
5110.70.4.200/3010.70.4.201 – 10.70.4.20210.70.4.203
5210.70.4.204/3010.70.4.205 – 10.70.4.20610.70.4.207
5310.70.4.208/3010.70.4.209 – 10.70.4.21010.70.4.211
5410.70.4.212/3010.70.4.213 – 10.70.4.21410.70.4.215
5510.70.4.216/3010.70.4.217 – 10.70.4.21810.70.4.219
5610.70.4.220/3010.70.4.221 – 10.70.4.22210.70.4.223
5710.70.4.224/3010.70.4.225 – 10.70.4.22610.70.4.227
5810.70.4.228/3010.70.4.229 – 10.70.4.23010.70.4.231
5910.70.4.232/3010.70.4.233 – 10.70.4.23410.70.4.235
6010.70.4.236/3010.70.4.237 – 10.70.4.23810.70.4.239
6110.70.4.240/3010.70.4.241 – 10.70.4.24210.70.4.243
6210.70.4.244/3010.70.4.245 – 10.70.4.24610.70.4.247
6310.70.4.248/3010.70.4.249 – 10.70.4.25010.70.4.251
6410.70.4.252/3010.70.4.253 – 10.70.4.25410.70.4.255
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 →