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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)10.2.56.0/24
network10.2.56.0/24
broadcast10.2.56.255
first host10.2.56.1
last host10.2.56.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.56.0/24
address00001010.00000010.00111000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00111000.00000000
broadcast00001010.00000010.00111000.11111111
green = network part, grey = host part
hex0x0a023800
decimal167917568
reverse dns0.56.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3800

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.56.0/3010.2.56.1 – 10.2.56.210.2.56.3
210.2.56.4/3010.2.56.5 – 10.2.56.610.2.56.7
310.2.56.8/3010.2.56.9 – 10.2.56.1010.2.56.11
410.2.56.12/3010.2.56.13 – 10.2.56.1410.2.56.15
510.2.56.16/3010.2.56.17 – 10.2.56.1810.2.56.19
610.2.56.20/3010.2.56.21 – 10.2.56.2210.2.56.23
710.2.56.24/3010.2.56.25 – 10.2.56.2610.2.56.27
810.2.56.28/3010.2.56.29 – 10.2.56.3010.2.56.31
910.2.56.32/3010.2.56.33 – 10.2.56.3410.2.56.35
1010.2.56.36/3010.2.56.37 – 10.2.56.3810.2.56.39
1110.2.56.40/3010.2.56.41 – 10.2.56.4210.2.56.43
1210.2.56.44/3010.2.56.45 – 10.2.56.4610.2.56.47
1310.2.56.48/3010.2.56.49 – 10.2.56.5010.2.56.51
1410.2.56.52/3010.2.56.53 – 10.2.56.5410.2.56.55
1510.2.56.56/3010.2.56.57 – 10.2.56.5810.2.56.59
1610.2.56.60/3010.2.56.61 – 10.2.56.6210.2.56.63
1710.2.56.64/3010.2.56.65 – 10.2.56.6610.2.56.67
1810.2.56.68/3010.2.56.69 – 10.2.56.7010.2.56.71
1910.2.56.72/3010.2.56.73 – 10.2.56.7410.2.56.75
2010.2.56.76/3010.2.56.77 – 10.2.56.7810.2.56.79
2110.2.56.80/3010.2.56.81 – 10.2.56.8210.2.56.83
2210.2.56.84/3010.2.56.85 – 10.2.56.8610.2.56.87
2310.2.56.88/3010.2.56.89 – 10.2.56.9010.2.56.91
2410.2.56.92/3010.2.56.93 – 10.2.56.9410.2.56.95
2510.2.56.96/3010.2.56.97 – 10.2.56.9810.2.56.99
2610.2.56.100/3010.2.56.101 – 10.2.56.10210.2.56.103
2710.2.56.104/3010.2.56.105 – 10.2.56.10610.2.56.107
2810.2.56.108/3010.2.56.109 – 10.2.56.11010.2.56.111
2910.2.56.112/3010.2.56.113 – 10.2.56.11410.2.56.115
3010.2.56.116/3010.2.56.117 – 10.2.56.11810.2.56.119
3110.2.56.120/3010.2.56.121 – 10.2.56.12210.2.56.123
3210.2.56.124/3010.2.56.125 – 10.2.56.12610.2.56.127
3310.2.56.128/3010.2.56.129 – 10.2.56.13010.2.56.131
3410.2.56.132/3010.2.56.133 – 10.2.56.13410.2.56.135
3510.2.56.136/3010.2.56.137 – 10.2.56.13810.2.56.139
3610.2.56.140/3010.2.56.141 – 10.2.56.14210.2.56.143
3710.2.56.144/3010.2.56.145 – 10.2.56.14610.2.56.147
3810.2.56.148/3010.2.56.149 – 10.2.56.15010.2.56.151
3910.2.56.152/3010.2.56.153 – 10.2.56.15410.2.56.155
4010.2.56.156/3010.2.56.157 – 10.2.56.15810.2.56.159
4110.2.56.160/3010.2.56.161 – 10.2.56.16210.2.56.163
4210.2.56.164/3010.2.56.165 – 10.2.56.16610.2.56.167
4310.2.56.168/3010.2.56.169 – 10.2.56.17010.2.56.171
4410.2.56.172/3010.2.56.173 – 10.2.56.17410.2.56.175
4510.2.56.176/3010.2.56.177 – 10.2.56.17810.2.56.179
4610.2.56.180/3010.2.56.181 – 10.2.56.18210.2.56.183
4710.2.56.184/3010.2.56.185 – 10.2.56.18610.2.56.187
4810.2.56.188/3010.2.56.189 – 10.2.56.19010.2.56.191
4910.2.56.192/3010.2.56.193 – 10.2.56.19410.2.56.195
5010.2.56.196/3010.2.56.197 – 10.2.56.19810.2.56.199
5110.2.56.200/3010.2.56.201 – 10.2.56.20210.2.56.203
5210.2.56.204/3010.2.56.205 – 10.2.56.20610.2.56.207
5310.2.56.208/3010.2.56.209 – 10.2.56.21010.2.56.211
5410.2.56.212/3010.2.56.213 – 10.2.56.21410.2.56.215
5510.2.56.216/3010.2.56.217 – 10.2.56.21810.2.56.219
5610.2.56.220/3010.2.56.221 – 10.2.56.22210.2.56.223
5710.2.56.224/3010.2.56.225 – 10.2.56.22610.2.56.227
5810.2.56.228/3010.2.56.229 – 10.2.56.23010.2.56.231
5910.2.56.232/3010.2.56.233 – 10.2.56.23410.2.56.235
6010.2.56.236/3010.2.56.237 – 10.2.56.23810.2.56.239
6110.2.56.240/3010.2.56.241 – 10.2.56.24210.2.56.243
6210.2.56.244/3010.2.56.245 – 10.2.56.24610.2.56.247
6310.2.56.248/3010.2.56.249 – 10.2.56.25010.2.56.251
6410.2.56.252/3010.2.56.253 – 10.2.56.25410.2.56.255
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 →