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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)10.72.77.0/24
network10.72.77.0/24
broadcast10.72.77.255
first host10.72.77.1
last host10.72.77.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.72.77.0/24
address00001010.01001000.01001101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001000.01001101.00000000
broadcast00001010.01001000.01001101.11111111
green = network part, grey = host part
hex0x0a484d00
decimal172510464
reverse dns0.77.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4d00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.77.0/3010.72.77.1 – 10.72.77.210.72.77.3
210.72.77.4/3010.72.77.5 – 10.72.77.610.72.77.7
310.72.77.8/3010.72.77.9 – 10.72.77.1010.72.77.11
410.72.77.12/3010.72.77.13 – 10.72.77.1410.72.77.15
510.72.77.16/3010.72.77.17 – 10.72.77.1810.72.77.19
610.72.77.20/3010.72.77.21 – 10.72.77.2210.72.77.23
710.72.77.24/3010.72.77.25 – 10.72.77.2610.72.77.27
810.72.77.28/3010.72.77.29 – 10.72.77.3010.72.77.31
910.72.77.32/3010.72.77.33 – 10.72.77.3410.72.77.35
1010.72.77.36/3010.72.77.37 – 10.72.77.3810.72.77.39
1110.72.77.40/3010.72.77.41 – 10.72.77.4210.72.77.43
1210.72.77.44/3010.72.77.45 – 10.72.77.4610.72.77.47
1310.72.77.48/3010.72.77.49 – 10.72.77.5010.72.77.51
1410.72.77.52/3010.72.77.53 – 10.72.77.5410.72.77.55
1510.72.77.56/3010.72.77.57 – 10.72.77.5810.72.77.59
1610.72.77.60/3010.72.77.61 – 10.72.77.6210.72.77.63
1710.72.77.64/3010.72.77.65 – 10.72.77.6610.72.77.67
1810.72.77.68/3010.72.77.69 – 10.72.77.7010.72.77.71
1910.72.77.72/3010.72.77.73 – 10.72.77.7410.72.77.75
2010.72.77.76/3010.72.77.77 – 10.72.77.7810.72.77.79
2110.72.77.80/3010.72.77.81 – 10.72.77.8210.72.77.83
2210.72.77.84/3010.72.77.85 – 10.72.77.8610.72.77.87
2310.72.77.88/3010.72.77.89 – 10.72.77.9010.72.77.91
2410.72.77.92/3010.72.77.93 – 10.72.77.9410.72.77.95
2510.72.77.96/3010.72.77.97 – 10.72.77.9810.72.77.99
2610.72.77.100/3010.72.77.101 – 10.72.77.10210.72.77.103
2710.72.77.104/3010.72.77.105 – 10.72.77.10610.72.77.107
2810.72.77.108/3010.72.77.109 – 10.72.77.11010.72.77.111
2910.72.77.112/3010.72.77.113 – 10.72.77.11410.72.77.115
3010.72.77.116/3010.72.77.117 – 10.72.77.11810.72.77.119
3110.72.77.120/3010.72.77.121 – 10.72.77.12210.72.77.123
3210.72.77.124/3010.72.77.125 – 10.72.77.12610.72.77.127
3310.72.77.128/3010.72.77.129 – 10.72.77.13010.72.77.131
3410.72.77.132/3010.72.77.133 – 10.72.77.13410.72.77.135
3510.72.77.136/3010.72.77.137 – 10.72.77.13810.72.77.139
3610.72.77.140/3010.72.77.141 – 10.72.77.14210.72.77.143
3710.72.77.144/3010.72.77.145 – 10.72.77.14610.72.77.147
3810.72.77.148/3010.72.77.149 – 10.72.77.15010.72.77.151
3910.72.77.152/3010.72.77.153 – 10.72.77.15410.72.77.155
4010.72.77.156/3010.72.77.157 – 10.72.77.15810.72.77.159
4110.72.77.160/3010.72.77.161 – 10.72.77.16210.72.77.163
4210.72.77.164/3010.72.77.165 – 10.72.77.16610.72.77.167
4310.72.77.168/3010.72.77.169 – 10.72.77.17010.72.77.171
4410.72.77.172/3010.72.77.173 – 10.72.77.17410.72.77.175
4510.72.77.176/3010.72.77.177 – 10.72.77.17810.72.77.179
4610.72.77.180/3010.72.77.181 – 10.72.77.18210.72.77.183
4710.72.77.184/3010.72.77.185 – 10.72.77.18610.72.77.187
4810.72.77.188/3010.72.77.189 – 10.72.77.19010.72.77.191
4910.72.77.192/3010.72.77.193 – 10.72.77.19410.72.77.195
5010.72.77.196/3010.72.77.197 – 10.72.77.19810.72.77.199
5110.72.77.200/3010.72.77.201 – 10.72.77.20210.72.77.203
5210.72.77.204/3010.72.77.205 – 10.72.77.20610.72.77.207
5310.72.77.208/3010.72.77.209 – 10.72.77.21010.72.77.211
5410.72.77.212/3010.72.77.213 – 10.72.77.21410.72.77.215
5510.72.77.216/3010.72.77.217 – 10.72.77.21810.72.77.219
5610.72.77.220/3010.72.77.221 – 10.72.77.22210.72.77.223
5710.72.77.224/3010.72.77.225 – 10.72.77.22610.72.77.227
5810.72.77.228/3010.72.77.229 – 10.72.77.23010.72.77.231
5910.72.77.232/3010.72.77.233 – 10.72.77.23410.72.77.235
6010.72.77.236/3010.72.77.237 – 10.72.77.23810.72.77.239
6110.72.77.240/3010.72.77.241 – 10.72.77.24210.72.77.243
6210.72.77.244/3010.72.77.245 – 10.72.77.24610.72.77.247
6310.72.77.248/3010.72.77.249 – 10.72.77.25010.72.77.251
6410.72.77.252/3010.72.77.253 – 10.72.77.25410.72.77.255
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 →