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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)10.4.217.0/24
network10.4.217.0/24
broadcast10.4.217.255
first host10.4.217.1
last host10.4.217.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.4.217.0/24
address00001010.00000100.11011001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000100.11011001.00000000
broadcast00001010.00000100.11011001.11111111
green = network part, grey = host part
hex0x0a04d900
decimal168089856
reverse dns0.217.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:d900

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.217.0/3010.4.217.1 – 10.4.217.210.4.217.3
210.4.217.4/3010.4.217.5 – 10.4.217.610.4.217.7
310.4.217.8/3010.4.217.9 – 10.4.217.1010.4.217.11
410.4.217.12/3010.4.217.13 – 10.4.217.1410.4.217.15
510.4.217.16/3010.4.217.17 – 10.4.217.1810.4.217.19
610.4.217.20/3010.4.217.21 – 10.4.217.2210.4.217.23
710.4.217.24/3010.4.217.25 – 10.4.217.2610.4.217.27
810.4.217.28/3010.4.217.29 – 10.4.217.3010.4.217.31
910.4.217.32/3010.4.217.33 – 10.4.217.3410.4.217.35
1010.4.217.36/3010.4.217.37 – 10.4.217.3810.4.217.39
1110.4.217.40/3010.4.217.41 – 10.4.217.4210.4.217.43
1210.4.217.44/3010.4.217.45 – 10.4.217.4610.4.217.47
1310.4.217.48/3010.4.217.49 – 10.4.217.5010.4.217.51
1410.4.217.52/3010.4.217.53 – 10.4.217.5410.4.217.55
1510.4.217.56/3010.4.217.57 – 10.4.217.5810.4.217.59
1610.4.217.60/3010.4.217.61 – 10.4.217.6210.4.217.63
1710.4.217.64/3010.4.217.65 – 10.4.217.6610.4.217.67
1810.4.217.68/3010.4.217.69 – 10.4.217.7010.4.217.71
1910.4.217.72/3010.4.217.73 – 10.4.217.7410.4.217.75
2010.4.217.76/3010.4.217.77 – 10.4.217.7810.4.217.79
2110.4.217.80/3010.4.217.81 – 10.4.217.8210.4.217.83
2210.4.217.84/3010.4.217.85 – 10.4.217.8610.4.217.87
2310.4.217.88/3010.4.217.89 – 10.4.217.9010.4.217.91
2410.4.217.92/3010.4.217.93 – 10.4.217.9410.4.217.95
2510.4.217.96/3010.4.217.97 – 10.4.217.9810.4.217.99
2610.4.217.100/3010.4.217.101 – 10.4.217.10210.4.217.103
2710.4.217.104/3010.4.217.105 – 10.4.217.10610.4.217.107
2810.4.217.108/3010.4.217.109 – 10.4.217.11010.4.217.111
2910.4.217.112/3010.4.217.113 – 10.4.217.11410.4.217.115
3010.4.217.116/3010.4.217.117 – 10.4.217.11810.4.217.119
3110.4.217.120/3010.4.217.121 – 10.4.217.12210.4.217.123
3210.4.217.124/3010.4.217.125 – 10.4.217.12610.4.217.127
3310.4.217.128/3010.4.217.129 – 10.4.217.13010.4.217.131
3410.4.217.132/3010.4.217.133 – 10.4.217.13410.4.217.135
3510.4.217.136/3010.4.217.137 – 10.4.217.13810.4.217.139
3610.4.217.140/3010.4.217.141 – 10.4.217.14210.4.217.143
3710.4.217.144/3010.4.217.145 – 10.4.217.14610.4.217.147
3810.4.217.148/3010.4.217.149 – 10.4.217.15010.4.217.151
3910.4.217.152/3010.4.217.153 – 10.4.217.15410.4.217.155
4010.4.217.156/3010.4.217.157 – 10.4.217.15810.4.217.159
4110.4.217.160/3010.4.217.161 – 10.4.217.16210.4.217.163
4210.4.217.164/3010.4.217.165 – 10.4.217.16610.4.217.167
4310.4.217.168/3010.4.217.169 – 10.4.217.17010.4.217.171
4410.4.217.172/3010.4.217.173 – 10.4.217.17410.4.217.175
4510.4.217.176/3010.4.217.177 – 10.4.217.17810.4.217.179
4610.4.217.180/3010.4.217.181 – 10.4.217.18210.4.217.183
4710.4.217.184/3010.4.217.185 – 10.4.217.18610.4.217.187
4810.4.217.188/3010.4.217.189 – 10.4.217.19010.4.217.191
4910.4.217.192/3010.4.217.193 – 10.4.217.19410.4.217.195
5010.4.217.196/3010.4.217.197 – 10.4.217.19810.4.217.199
5110.4.217.200/3010.4.217.201 – 10.4.217.20210.4.217.203
5210.4.217.204/3010.4.217.205 – 10.4.217.20610.4.217.207
5310.4.217.208/3010.4.217.209 – 10.4.217.21010.4.217.211
5410.4.217.212/3010.4.217.213 – 10.4.217.21410.4.217.215
5510.4.217.216/3010.4.217.217 – 10.4.217.21810.4.217.219
5610.4.217.220/3010.4.217.221 – 10.4.217.22210.4.217.223
5710.4.217.224/3010.4.217.225 – 10.4.217.22610.4.217.227
5810.4.217.228/3010.4.217.229 – 10.4.217.23010.4.217.231
5910.4.217.232/3010.4.217.233 – 10.4.217.23410.4.217.235
6010.4.217.236/3010.4.217.237 – 10.4.217.23810.4.217.239
6110.4.217.240/3010.4.217.241 – 10.4.217.24210.4.217.243
6210.4.217.244/3010.4.217.245 – 10.4.217.24610.4.217.247
6310.4.217.248/3010.4.217.249 – 10.4.217.25010.4.217.251
6410.4.217.252/3010.4.217.253 – 10.4.217.25410.4.217.255
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 →