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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)10.64.8.0/24
network10.64.8.0/24
broadcast10.64.8.255
first host10.64.8.1
last host10.64.8.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.64.8.0/24
address00001010.01000000.00001000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000000.00001000.00000000
broadcast00001010.01000000.00001000.11111111
green = network part, grey = host part
hex0x0a400800
decimal171968512
reverse dns0.8.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:800

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.64.8.0/3010.64.8.1 – 10.64.8.210.64.8.3
210.64.8.4/3010.64.8.5 – 10.64.8.610.64.8.7
310.64.8.8/3010.64.8.9 – 10.64.8.1010.64.8.11
410.64.8.12/3010.64.8.13 – 10.64.8.1410.64.8.15
510.64.8.16/3010.64.8.17 – 10.64.8.1810.64.8.19
610.64.8.20/3010.64.8.21 – 10.64.8.2210.64.8.23
710.64.8.24/3010.64.8.25 – 10.64.8.2610.64.8.27
810.64.8.28/3010.64.8.29 – 10.64.8.3010.64.8.31
910.64.8.32/3010.64.8.33 – 10.64.8.3410.64.8.35
1010.64.8.36/3010.64.8.37 – 10.64.8.3810.64.8.39
1110.64.8.40/3010.64.8.41 – 10.64.8.4210.64.8.43
1210.64.8.44/3010.64.8.45 – 10.64.8.4610.64.8.47
1310.64.8.48/3010.64.8.49 – 10.64.8.5010.64.8.51
1410.64.8.52/3010.64.8.53 – 10.64.8.5410.64.8.55
1510.64.8.56/3010.64.8.57 – 10.64.8.5810.64.8.59
1610.64.8.60/3010.64.8.61 – 10.64.8.6210.64.8.63
1710.64.8.64/3010.64.8.65 – 10.64.8.6610.64.8.67
1810.64.8.68/3010.64.8.69 – 10.64.8.7010.64.8.71
1910.64.8.72/3010.64.8.73 – 10.64.8.7410.64.8.75
2010.64.8.76/3010.64.8.77 – 10.64.8.7810.64.8.79
2110.64.8.80/3010.64.8.81 – 10.64.8.8210.64.8.83
2210.64.8.84/3010.64.8.85 – 10.64.8.8610.64.8.87
2310.64.8.88/3010.64.8.89 – 10.64.8.9010.64.8.91
2410.64.8.92/3010.64.8.93 – 10.64.8.9410.64.8.95
2510.64.8.96/3010.64.8.97 – 10.64.8.9810.64.8.99
2610.64.8.100/3010.64.8.101 – 10.64.8.10210.64.8.103
2710.64.8.104/3010.64.8.105 – 10.64.8.10610.64.8.107
2810.64.8.108/3010.64.8.109 – 10.64.8.11010.64.8.111
2910.64.8.112/3010.64.8.113 – 10.64.8.11410.64.8.115
3010.64.8.116/3010.64.8.117 – 10.64.8.11810.64.8.119
3110.64.8.120/3010.64.8.121 – 10.64.8.12210.64.8.123
3210.64.8.124/3010.64.8.125 – 10.64.8.12610.64.8.127
3310.64.8.128/3010.64.8.129 – 10.64.8.13010.64.8.131
3410.64.8.132/3010.64.8.133 – 10.64.8.13410.64.8.135
3510.64.8.136/3010.64.8.137 – 10.64.8.13810.64.8.139
3610.64.8.140/3010.64.8.141 – 10.64.8.14210.64.8.143
3710.64.8.144/3010.64.8.145 – 10.64.8.14610.64.8.147
3810.64.8.148/3010.64.8.149 – 10.64.8.15010.64.8.151
3910.64.8.152/3010.64.8.153 – 10.64.8.15410.64.8.155
4010.64.8.156/3010.64.8.157 – 10.64.8.15810.64.8.159
4110.64.8.160/3010.64.8.161 – 10.64.8.16210.64.8.163
4210.64.8.164/3010.64.8.165 – 10.64.8.16610.64.8.167
4310.64.8.168/3010.64.8.169 – 10.64.8.17010.64.8.171
4410.64.8.172/3010.64.8.173 – 10.64.8.17410.64.8.175
4510.64.8.176/3010.64.8.177 – 10.64.8.17810.64.8.179
4610.64.8.180/3010.64.8.181 – 10.64.8.18210.64.8.183
4710.64.8.184/3010.64.8.185 – 10.64.8.18610.64.8.187
4810.64.8.188/3010.64.8.189 – 10.64.8.19010.64.8.191
4910.64.8.192/3010.64.8.193 – 10.64.8.19410.64.8.195
5010.64.8.196/3010.64.8.197 – 10.64.8.19810.64.8.199
5110.64.8.200/3010.64.8.201 – 10.64.8.20210.64.8.203
5210.64.8.204/3010.64.8.205 – 10.64.8.20610.64.8.207
5310.64.8.208/3010.64.8.209 – 10.64.8.21010.64.8.211
5410.64.8.212/3010.64.8.213 – 10.64.8.21410.64.8.215
5510.64.8.216/3010.64.8.217 – 10.64.8.21810.64.8.219
5610.64.8.220/3010.64.8.221 – 10.64.8.22210.64.8.223
5710.64.8.224/3010.64.8.225 – 10.64.8.22610.64.8.227
5810.64.8.228/3010.64.8.229 – 10.64.8.23010.64.8.231
5910.64.8.232/3010.64.8.233 – 10.64.8.23410.64.8.235
6010.64.8.236/3010.64.8.237 – 10.64.8.23810.64.8.239
6110.64.8.240/3010.64.8.241 – 10.64.8.24210.64.8.243
6210.64.8.244/3010.64.8.245 – 10.64.8.24610.64.8.247
6310.64.8.248/3010.64.8.249 – 10.64.8.25010.64.8.251
6410.64.8.252/3010.64.8.253 – 10.64.8.25410.64.8.255
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 →