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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)10.65.87.0/24
network10.65.87.0/24
broadcast10.65.87.255
first host10.65.87.1
last host10.65.87.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.65.87.0/24
address00001010.01000001.01010111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000001.01010111.00000000
broadcast00001010.01000001.01010111.11111111
green = network part, grey = host part
hex0x0a415700
decimal172054272
reverse dns0.87.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:5700

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.65.87.0/3010.65.87.1 – 10.65.87.210.65.87.3
210.65.87.4/3010.65.87.5 – 10.65.87.610.65.87.7
310.65.87.8/3010.65.87.9 – 10.65.87.1010.65.87.11
410.65.87.12/3010.65.87.13 – 10.65.87.1410.65.87.15
510.65.87.16/3010.65.87.17 – 10.65.87.1810.65.87.19
610.65.87.20/3010.65.87.21 – 10.65.87.2210.65.87.23
710.65.87.24/3010.65.87.25 – 10.65.87.2610.65.87.27
810.65.87.28/3010.65.87.29 – 10.65.87.3010.65.87.31
910.65.87.32/3010.65.87.33 – 10.65.87.3410.65.87.35
1010.65.87.36/3010.65.87.37 – 10.65.87.3810.65.87.39
1110.65.87.40/3010.65.87.41 – 10.65.87.4210.65.87.43
1210.65.87.44/3010.65.87.45 – 10.65.87.4610.65.87.47
1310.65.87.48/3010.65.87.49 – 10.65.87.5010.65.87.51
1410.65.87.52/3010.65.87.53 – 10.65.87.5410.65.87.55
1510.65.87.56/3010.65.87.57 – 10.65.87.5810.65.87.59
1610.65.87.60/3010.65.87.61 – 10.65.87.6210.65.87.63
1710.65.87.64/3010.65.87.65 – 10.65.87.6610.65.87.67
1810.65.87.68/3010.65.87.69 – 10.65.87.7010.65.87.71
1910.65.87.72/3010.65.87.73 – 10.65.87.7410.65.87.75
2010.65.87.76/3010.65.87.77 – 10.65.87.7810.65.87.79
2110.65.87.80/3010.65.87.81 – 10.65.87.8210.65.87.83
2210.65.87.84/3010.65.87.85 – 10.65.87.8610.65.87.87
2310.65.87.88/3010.65.87.89 – 10.65.87.9010.65.87.91
2410.65.87.92/3010.65.87.93 – 10.65.87.9410.65.87.95
2510.65.87.96/3010.65.87.97 – 10.65.87.9810.65.87.99
2610.65.87.100/3010.65.87.101 – 10.65.87.10210.65.87.103
2710.65.87.104/3010.65.87.105 – 10.65.87.10610.65.87.107
2810.65.87.108/3010.65.87.109 – 10.65.87.11010.65.87.111
2910.65.87.112/3010.65.87.113 – 10.65.87.11410.65.87.115
3010.65.87.116/3010.65.87.117 – 10.65.87.11810.65.87.119
3110.65.87.120/3010.65.87.121 – 10.65.87.12210.65.87.123
3210.65.87.124/3010.65.87.125 – 10.65.87.12610.65.87.127
3310.65.87.128/3010.65.87.129 – 10.65.87.13010.65.87.131
3410.65.87.132/3010.65.87.133 – 10.65.87.13410.65.87.135
3510.65.87.136/3010.65.87.137 – 10.65.87.13810.65.87.139
3610.65.87.140/3010.65.87.141 – 10.65.87.14210.65.87.143
3710.65.87.144/3010.65.87.145 – 10.65.87.14610.65.87.147
3810.65.87.148/3010.65.87.149 – 10.65.87.15010.65.87.151
3910.65.87.152/3010.65.87.153 – 10.65.87.15410.65.87.155
4010.65.87.156/3010.65.87.157 – 10.65.87.15810.65.87.159
4110.65.87.160/3010.65.87.161 – 10.65.87.16210.65.87.163
4210.65.87.164/3010.65.87.165 – 10.65.87.16610.65.87.167
4310.65.87.168/3010.65.87.169 – 10.65.87.17010.65.87.171
4410.65.87.172/3010.65.87.173 – 10.65.87.17410.65.87.175
4510.65.87.176/3010.65.87.177 – 10.65.87.17810.65.87.179
4610.65.87.180/3010.65.87.181 – 10.65.87.18210.65.87.183
4710.65.87.184/3010.65.87.185 – 10.65.87.18610.65.87.187
4810.65.87.188/3010.65.87.189 – 10.65.87.19010.65.87.191
4910.65.87.192/3010.65.87.193 – 10.65.87.19410.65.87.195
5010.65.87.196/3010.65.87.197 – 10.65.87.19810.65.87.199
5110.65.87.200/3010.65.87.201 – 10.65.87.20210.65.87.203
5210.65.87.204/3010.65.87.205 – 10.65.87.20610.65.87.207
5310.65.87.208/3010.65.87.209 – 10.65.87.21010.65.87.211
5410.65.87.212/3010.65.87.213 – 10.65.87.21410.65.87.215
5510.65.87.216/3010.65.87.217 – 10.65.87.21810.65.87.219
5610.65.87.220/3010.65.87.221 – 10.65.87.22210.65.87.223
5710.65.87.224/3010.65.87.225 – 10.65.87.22610.65.87.227
5810.65.87.228/3010.65.87.229 – 10.65.87.23010.65.87.231
5910.65.87.232/3010.65.87.233 – 10.65.87.23410.65.87.235
6010.65.87.236/3010.65.87.237 – 10.65.87.23810.65.87.239
6110.65.87.240/3010.65.87.241 – 10.65.87.24210.65.87.243
6210.65.87.244/3010.65.87.245 – 10.65.87.24610.65.87.247
6310.65.87.248/3010.65.87.249 – 10.65.87.25010.65.87.251
6410.65.87.252/3010.65.87.253 – 10.65.87.25410.65.87.255
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 →