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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)10.64.76.0/24
network10.64.76.0/24
broadcast10.64.76.255
first host10.64.76.1
last host10.64.76.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.64.76.0/24
address00001010.01000000.01001100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000000.01001100.00000000
broadcast00001010.01000000.01001100.11111111
green = network part, grey = host part
hex0x0a404c00
decimal171985920
reverse dns0.76.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:4c00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.64.76.0/3010.64.76.1 – 10.64.76.210.64.76.3
210.64.76.4/3010.64.76.5 – 10.64.76.610.64.76.7
310.64.76.8/3010.64.76.9 – 10.64.76.1010.64.76.11
410.64.76.12/3010.64.76.13 – 10.64.76.1410.64.76.15
510.64.76.16/3010.64.76.17 – 10.64.76.1810.64.76.19
610.64.76.20/3010.64.76.21 – 10.64.76.2210.64.76.23
710.64.76.24/3010.64.76.25 – 10.64.76.2610.64.76.27
810.64.76.28/3010.64.76.29 – 10.64.76.3010.64.76.31
910.64.76.32/3010.64.76.33 – 10.64.76.3410.64.76.35
1010.64.76.36/3010.64.76.37 – 10.64.76.3810.64.76.39
1110.64.76.40/3010.64.76.41 – 10.64.76.4210.64.76.43
1210.64.76.44/3010.64.76.45 – 10.64.76.4610.64.76.47
1310.64.76.48/3010.64.76.49 – 10.64.76.5010.64.76.51
1410.64.76.52/3010.64.76.53 – 10.64.76.5410.64.76.55
1510.64.76.56/3010.64.76.57 – 10.64.76.5810.64.76.59
1610.64.76.60/3010.64.76.61 – 10.64.76.6210.64.76.63
1710.64.76.64/3010.64.76.65 – 10.64.76.6610.64.76.67
1810.64.76.68/3010.64.76.69 – 10.64.76.7010.64.76.71
1910.64.76.72/3010.64.76.73 – 10.64.76.7410.64.76.75
2010.64.76.76/3010.64.76.77 – 10.64.76.7810.64.76.79
2110.64.76.80/3010.64.76.81 – 10.64.76.8210.64.76.83
2210.64.76.84/3010.64.76.85 – 10.64.76.8610.64.76.87
2310.64.76.88/3010.64.76.89 – 10.64.76.9010.64.76.91
2410.64.76.92/3010.64.76.93 – 10.64.76.9410.64.76.95
2510.64.76.96/3010.64.76.97 – 10.64.76.9810.64.76.99
2610.64.76.100/3010.64.76.101 – 10.64.76.10210.64.76.103
2710.64.76.104/3010.64.76.105 – 10.64.76.10610.64.76.107
2810.64.76.108/3010.64.76.109 – 10.64.76.11010.64.76.111
2910.64.76.112/3010.64.76.113 – 10.64.76.11410.64.76.115
3010.64.76.116/3010.64.76.117 – 10.64.76.11810.64.76.119
3110.64.76.120/3010.64.76.121 – 10.64.76.12210.64.76.123
3210.64.76.124/3010.64.76.125 – 10.64.76.12610.64.76.127
3310.64.76.128/3010.64.76.129 – 10.64.76.13010.64.76.131
3410.64.76.132/3010.64.76.133 – 10.64.76.13410.64.76.135
3510.64.76.136/3010.64.76.137 – 10.64.76.13810.64.76.139
3610.64.76.140/3010.64.76.141 – 10.64.76.14210.64.76.143
3710.64.76.144/3010.64.76.145 – 10.64.76.14610.64.76.147
3810.64.76.148/3010.64.76.149 – 10.64.76.15010.64.76.151
3910.64.76.152/3010.64.76.153 – 10.64.76.15410.64.76.155
4010.64.76.156/3010.64.76.157 – 10.64.76.15810.64.76.159
4110.64.76.160/3010.64.76.161 – 10.64.76.16210.64.76.163
4210.64.76.164/3010.64.76.165 – 10.64.76.16610.64.76.167
4310.64.76.168/3010.64.76.169 – 10.64.76.17010.64.76.171
4410.64.76.172/3010.64.76.173 – 10.64.76.17410.64.76.175
4510.64.76.176/3010.64.76.177 – 10.64.76.17810.64.76.179
4610.64.76.180/3010.64.76.181 – 10.64.76.18210.64.76.183
4710.64.76.184/3010.64.76.185 – 10.64.76.18610.64.76.187
4810.64.76.188/3010.64.76.189 – 10.64.76.19010.64.76.191
4910.64.76.192/3010.64.76.193 – 10.64.76.19410.64.76.195
5010.64.76.196/3010.64.76.197 – 10.64.76.19810.64.76.199
5110.64.76.200/3010.64.76.201 – 10.64.76.20210.64.76.203
5210.64.76.204/3010.64.76.205 – 10.64.76.20610.64.76.207
5310.64.76.208/3010.64.76.209 – 10.64.76.21010.64.76.211
5410.64.76.212/3010.64.76.213 – 10.64.76.21410.64.76.215
5510.64.76.216/3010.64.76.217 – 10.64.76.21810.64.76.219
5610.64.76.220/3010.64.76.221 – 10.64.76.22210.64.76.223
5710.64.76.224/3010.64.76.225 – 10.64.76.22610.64.76.227
5810.64.76.228/3010.64.76.229 – 10.64.76.23010.64.76.231
5910.64.76.232/3010.64.76.233 – 10.64.76.23410.64.76.235
6010.64.76.236/3010.64.76.237 – 10.64.76.23810.64.76.239
6110.64.76.240/3010.64.76.241 – 10.64.76.24210.64.76.243
6210.64.76.244/3010.64.76.245 – 10.64.76.24610.64.76.247
6310.64.76.248/3010.64.76.249 – 10.64.76.25010.64.76.251
6410.64.76.252/3010.64.76.253 – 10.64.76.25410.64.76.255
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 →