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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)10.149.236.0/24
network10.149.236.0/24
broadcast10.149.236.255
first host10.149.236.1
last host10.149.236.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.149.236.0/24
address00001010.10010101.11101100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10010101.11101100.00000000
broadcast00001010.10010101.11101100.11111111
green = network part, grey = host part
hex0x0a95ec00
decimal177597440
reverse dns0.236.149.10.in-addr.arpa
ipv4-mapped::ffff:a95:ec00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.149.236.0/3010.149.236.1 – 10.149.236.210.149.236.3
210.149.236.4/3010.149.236.5 – 10.149.236.610.149.236.7
310.149.236.8/3010.149.236.9 – 10.149.236.1010.149.236.11
410.149.236.12/3010.149.236.13 – 10.149.236.1410.149.236.15
510.149.236.16/3010.149.236.17 – 10.149.236.1810.149.236.19
610.149.236.20/3010.149.236.21 – 10.149.236.2210.149.236.23
710.149.236.24/3010.149.236.25 – 10.149.236.2610.149.236.27
810.149.236.28/3010.149.236.29 – 10.149.236.3010.149.236.31
910.149.236.32/3010.149.236.33 – 10.149.236.3410.149.236.35
1010.149.236.36/3010.149.236.37 – 10.149.236.3810.149.236.39
1110.149.236.40/3010.149.236.41 – 10.149.236.4210.149.236.43
1210.149.236.44/3010.149.236.45 – 10.149.236.4610.149.236.47
1310.149.236.48/3010.149.236.49 – 10.149.236.5010.149.236.51
1410.149.236.52/3010.149.236.53 – 10.149.236.5410.149.236.55
1510.149.236.56/3010.149.236.57 – 10.149.236.5810.149.236.59
1610.149.236.60/3010.149.236.61 – 10.149.236.6210.149.236.63
1710.149.236.64/3010.149.236.65 – 10.149.236.6610.149.236.67
1810.149.236.68/3010.149.236.69 – 10.149.236.7010.149.236.71
1910.149.236.72/3010.149.236.73 – 10.149.236.7410.149.236.75
2010.149.236.76/3010.149.236.77 – 10.149.236.7810.149.236.79
2110.149.236.80/3010.149.236.81 – 10.149.236.8210.149.236.83
2210.149.236.84/3010.149.236.85 – 10.149.236.8610.149.236.87
2310.149.236.88/3010.149.236.89 – 10.149.236.9010.149.236.91
2410.149.236.92/3010.149.236.93 – 10.149.236.9410.149.236.95
2510.149.236.96/3010.149.236.97 – 10.149.236.9810.149.236.99
2610.149.236.100/3010.149.236.101 – 10.149.236.10210.149.236.103
2710.149.236.104/3010.149.236.105 – 10.149.236.10610.149.236.107
2810.149.236.108/3010.149.236.109 – 10.149.236.11010.149.236.111
2910.149.236.112/3010.149.236.113 – 10.149.236.11410.149.236.115
3010.149.236.116/3010.149.236.117 – 10.149.236.11810.149.236.119
3110.149.236.120/3010.149.236.121 – 10.149.236.12210.149.236.123
3210.149.236.124/3010.149.236.125 – 10.149.236.12610.149.236.127
3310.149.236.128/3010.149.236.129 – 10.149.236.13010.149.236.131
3410.149.236.132/3010.149.236.133 – 10.149.236.13410.149.236.135
3510.149.236.136/3010.149.236.137 – 10.149.236.13810.149.236.139
3610.149.236.140/3010.149.236.141 – 10.149.236.14210.149.236.143
3710.149.236.144/3010.149.236.145 – 10.149.236.14610.149.236.147
3810.149.236.148/3010.149.236.149 – 10.149.236.15010.149.236.151
3910.149.236.152/3010.149.236.153 – 10.149.236.15410.149.236.155
4010.149.236.156/3010.149.236.157 – 10.149.236.15810.149.236.159
4110.149.236.160/3010.149.236.161 – 10.149.236.16210.149.236.163
4210.149.236.164/3010.149.236.165 – 10.149.236.16610.149.236.167
4310.149.236.168/3010.149.236.169 – 10.149.236.17010.149.236.171
4410.149.236.172/3010.149.236.173 – 10.149.236.17410.149.236.175
4510.149.236.176/3010.149.236.177 – 10.149.236.17810.149.236.179
4610.149.236.180/3010.149.236.181 – 10.149.236.18210.149.236.183
4710.149.236.184/3010.149.236.185 – 10.149.236.18610.149.236.187
4810.149.236.188/3010.149.236.189 – 10.149.236.19010.149.236.191
4910.149.236.192/3010.149.236.193 – 10.149.236.19410.149.236.195
5010.149.236.196/3010.149.236.197 – 10.149.236.19810.149.236.199
5110.149.236.200/3010.149.236.201 – 10.149.236.20210.149.236.203
5210.149.236.204/3010.149.236.205 – 10.149.236.20610.149.236.207
5310.149.236.208/3010.149.236.209 – 10.149.236.21010.149.236.211
5410.149.236.212/3010.149.236.213 – 10.149.236.21410.149.236.215
5510.149.236.216/3010.149.236.217 – 10.149.236.21810.149.236.219
5610.149.236.220/3010.149.236.221 – 10.149.236.22210.149.236.223
5710.149.236.224/3010.149.236.225 – 10.149.236.22610.149.236.227
5810.149.236.228/3010.149.236.229 – 10.149.236.23010.149.236.231
5910.149.236.232/3010.149.236.233 – 10.149.236.23410.149.236.235
6010.149.236.236/3010.149.236.237 – 10.149.236.23810.149.236.239
6110.149.236.240/3010.149.236.241 – 10.149.236.24210.149.236.243
6210.149.236.244/3010.149.236.245 – 10.149.236.24610.149.236.247
6310.149.236.248/3010.149.236.249 – 10.149.236.25010.149.236.251
6410.149.236.252/3010.149.236.253 – 10.149.236.25410.149.236.255
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 →