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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)10.18.7.0/24
network10.18.7.0/24
broadcast10.18.7.255
first host10.18.7.1
last host10.18.7.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.18.7.0/24
address00001010.00010010.00000111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00010010.00000111.00000000
broadcast00001010.00010010.00000111.11111111
green = network part, grey = host part
hex0x0a120700
decimal168953600
reverse dns0.7.18.10.in-addr.arpa
ipv4-mapped::ffff:a12:700

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.18.7.0/3010.18.7.1 – 10.18.7.210.18.7.3
210.18.7.4/3010.18.7.5 – 10.18.7.610.18.7.7
310.18.7.8/3010.18.7.9 – 10.18.7.1010.18.7.11
410.18.7.12/3010.18.7.13 – 10.18.7.1410.18.7.15
510.18.7.16/3010.18.7.17 – 10.18.7.1810.18.7.19
610.18.7.20/3010.18.7.21 – 10.18.7.2210.18.7.23
710.18.7.24/3010.18.7.25 – 10.18.7.2610.18.7.27
810.18.7.28/3010.18.7.29 – 10.18.7.3010.18.7.31
910.18.7.32/3010.18.7.33 – 10.18.7.3410.18.7.35
1010.18.7.36/3010.18.7.37 – 10.18.7.3810.18.7.39
1110.18.7.40/3010.18.7.41 – 10.18.7.4210.18.7.43
1210.18.7.44/3010.18.7.45 – 10.18.7.4610.18.7.47
1310.18.7.48/3010.18.7.49 – 10.18.7.5010.18.7.51
1410.18.7.52/3010.18.7.53 – 10.18.7.5410.18.7.55
1510.18.7.56/3010.18.7.57 – 10.18.7.5810.18.7.59
1610.18.7.60/3010.18.7.61 – 10.18.7.6210.18.7.63
1710.18.7.64/3010.18.7.65 – 10.18.7.6610.18.7.67
1810.18.7.68/3010.18.7.69 – 10.18.7.7010.18.7.71
1910.18.7.72/3010.18.7.73 – 10.18.7.7410.18.7.75
2010.18.7.76/3010.18.7.77 – 10.18.7.7810.18.7.79
2110.18.7.80/3010.18.7.81 – 10.18.7.8210.18.7.83
2210.18.7.84/3010.18.7.85 – 10.18.7.8610.18.7.87
2310.18.7.88/3010.18.7.89 – 10.18.7.9010.18.7.91
2410.18.7.92/3010.18.7.93 – 10.18.7.9410.18.7.95
2510.18.7.96/3010.18.7.97 – 10.18.7.9810.18.7.99
2610.18.7.100/3010.18.7.101 – 10.18.7.10210.18.7.103
2710.18.7.104/3010.18.7.105 – 10.18.7.10610.18.7.107
2810.18.7.108/3010.18.7.109 – 10.18.7.11010.18.7.111
2910.18.7.112/3010.18.7.113 – 10.18.7.11410.18.7.115
3010.18.7.116/3010.18.7.117 – 10.18.7.11810.18.7.119
3110.18.7.120/3010.18.7.121 – 10.18.7.12210.18.7.123
3210.18.7.124/3010.18.7.125 – 10.18.7.12610.18.7.127
3310.18.7.128/3010.18.7.129 – 10.18.7.13010.18.7.131
3410.18.7.132/3010.18.7.133 – 10.18.7.13410.18.7.135
3510.18.7.136/3010.18.7.137 – 10.18.7.13810.18.7.139
3610.18.7.140/3010.18.7.141 – 10.18.7.14210.18.7.143
3710.18.7.144/3010.18.7.145 – 10.18.7.14610.18.7.147
3810.18.7.148/3010.18.7.149 – 10.18.7.15010.18.7.151
3910.18.7.152/3010.18.7.153 – 10.18.7.15410.18.7.155
4010.18.7.156/3010.18.7.157 – 10.18.7.15810.18.7.159
4110.18.7.160/3010.18.7.161 – 10.18.7.16210.18.7.163
4210.18.7.164/3010.18.7.165 – 10.18.7.16610.18.7.167
4310.18.7.168/3010.18.7.169 – 10.18.7.17010.18.7.171
4410.18.7.172/3010.18.7.173 – 10.18.7.17410.18.7.175
4510.18.7.176/3010.18.7.177 – 10.18.7.17810.18.7.179
4610.18.7.180/3010.18.7.181 – 10.18.7.18210.18.7.183
4710.18.7.184/3010.18.7.185 – 10.18.7.18610.18.7.187
4810.18.7.188/3010.18.7.189 – 10.18.7.19010.18.7.191
4910.18.7.192/3010.18.7.193 – 10.18.7.19410.18.7.195
5010.18.7.196/3010.18.7.197 – 10.18.7.19810.18.7.199
5110.18.7.200/3010.18.7.201 – 10.18.7.20210.18.7.203
5210.18.7.204/3010.18.7.205 – 10.18.7.20610.18.7.207
5310.18.7.208/3010.18.7.209 – 10.18.7.21010.18.7.211
5410.18.7.212/3010.18.7.213 – 10.18.7.21410.18.7.215
5510.18.7.216/3010.18.7.217 – 10.18.7.21810.18.7.219
5610.18.7.220/3010.18.7.221 – 10.18.7.22210.18.7.223
5710.18.7.224/3010.18.7.225 – 10.18.7.22610.18.7.227
5810.18.7.228/3010.18.7.229 – 10.18.7.23010.18.7.231
5910.18.7.232/3010.18.7.233 – 10.18.7.23410.18.7.235
6010.18.7.236/3010.18.7.237 – 10.18.7.23810.18.7.239
6110.18.7.240/3010.18.7.241 – 10.18.7.24210.18.7.243
6210.18.7.244/3010.18.7.245 – 10.18.7.24610.18.7.247
6310.18.7.248/3010.18.7.249 – 10.18.7.25010.18.7.251
6410.18.7.252/3010.18.7.253 – 10.18.7.25410.18.7.255
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 →