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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)10.0.126.0/24
network10.0.126.0/24
broadcast10.0.126.255
first host10.0.126.1
last host10.0.126.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.126.0/24
address00001010.00000000.01111110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.01111110.00000000
broadcast00001010.00000000.01111110.11111111
green = network part, grey = host part
hex0x0a007e00
decimal167804416
reverse dns0.126.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:7e00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.126.0/3010.0.126.1 – 10.0.126.210.0.126.3
210.0.126.4/3010.0.126.5 – 10.0.126.610.0.126.7
310.0.126.8/3010.0.126.9 – 10.0.126.1010.0.126.11
410.0.126.12/3010.0.126.13 – 10.0.126.1410.0.126.15
510.0.126.16/3010.0.126.17 – 10.0.126.1810.0.126.19
610.0.126.20/3010.0.126.21 – 10.0.126.2210.0.126.23
710.0.126.24/3010.0.126.25 – 10.0.126.2610.0.126.27
810.0.126.28/3010.0.126.29 – 10.0.126.3010.0.126.31
910.0.126.32/3010.0.126.33 – 10.0.126.3410.0.126.35
1010.0.126.36/3010.0.126.37 – 10.0.126.3810.0.126.39
1110.0.126.40/3010.0.126.41 – 10.0.126.4210.0.126.43
1210.0.126.44/3010.0.126.45 – 10.0.126.4610.0.126.47
1310.0.126.48/3010.0.126.49 – 10.0.126.5010.0.126.51
1410.0.126.52/3010.0.126.53 – 10.0.126.5410.0.126.55
1510.0.126.56/3010.0.126.57 – 10.0.126.5810.0.126.59
1610.0.126.60/3010.0.126.61 – 10.0.126.6210.0.126.63
1710.0.126.64/3010.0.126.65 – 10.0.126.6610.0.126.67
1810.0.126.68/3010.0.126.69 – 10.0.126.7010.0.126.71
1910.0.126.72/3010.0.126.73 – 10.0.126.7410.0.126.75
2010.0.126.76/3010.0.126.77 – 10.0.126.7810.0.126.79
2110.0.126.80/3010.0.126.81 – 10.0.126.8210.0.126.83
2210.0.126.84/3010.0.126.85 – 10.0.126.8610.0.126.87
2310.0.126.88/3010.0.126.89 – 10.0.126.9010.0.126.91
2410.0.126.92/3010.0.126.93 – 10.0.126.9410.0.126.95
2510.0.126.96/3010.0.126.97 – 10.0.126.9810.0.126.99
2610.0.126.100/3010.0.126.101 – 10.0.126.10210.0.126.103
2710.0.126.104/3010.0.126.105 – 10.0.126.10610.0.126.107
2810.0.126.108/3010.0.126.109 – 10.0.126.11010.0.126.111
2910.0.126.112/3010.0.126.113 – 10.0.126.11410.0.126.115
3010.0.126.116/3010.0.126.117 – 10.0.126.11810.0.126.119
3110.0.126.120/3010.0.126.121 – 10.0.126.12210.0.126.123
3210.0.126.124/3010.0.126.125 – 10.0.126.12610.0.126.127
3310.0.126.128/3010.0.126.129 – 10.0.126.13010.0.126.131
3410.0.126.132/3010.0.126.133 – 10.0.126.13410.0.126.135
3510.0.126.136/3010.0.126.137 – 10.0.126.13810.0.126.139
3610.0.126.140/3010.0.126.141 – 10.0.126.14210.0.126.143
3710.0.126.144/3010.0.126.145 – 10.0.126.14610.0.126.147
3810.0.126.148/3010.0.126.149 – 10.0.126.15010.0.126.151
3910.0.126.152/3010.0.126.153 – 10.0.126.15410.0.126.155
4010.0.126.156/3010.0.126.157 – 10.0.126.15810.0.126.159
4110.0.126.160/3010.0.126.161 – 10.0.126.16210.0.126.163
4210.0.126.164/3010.0.126.165 – 10.0.126.16610.0.126.167
4310.0.126.168/3010.0.126.169 – 10.0.126.17010.0.126.171
4410.0.126.172/3010.0.126.173 – 10.0.126.17410.0.126.175
4510.0.126.176/3010.0.126.177 – 10.0.126.17810.0.126.179
4610.0.126.180/3010.0.126.181 – 10.0.126.18210.0.126.183
4710.0.126.184/3010.0.126.185 – 10.0.126.18610.0.126.187
4810.0.126.188/3010.0.126.189 – 10.0.126.19010.0.126.191
4910.0.126.192/3010.0.126.193 – 10.0.126.19410.0.126.195
5010.0.126.196/3010.0.126.197 – 10.0.126.19810.0.126.199
5110.0.126.200/3010.0.126.201 – 10.0.126.20210.0.126.203
5210.0.126.204/3010.0.126.205 – 10.0.126.20610.0.126.207
5310.0.126.208/3010.0.126.209 – 10.0.126.21010.0.126.211
5410.0.126.212/3010.0.126.213 – 10.0.126.21410.0.126.215
5510.0.126.216/3010.0.126.217 – 10.0.126.21810.0.126.219
5610.0.126.220/3010.0.126.221 – 10.0.126.22210.0.126.223
5710.0.126.224/3010.0.126.225 – 10.0.126.22610.0.126.227
5810.0.126.228/3010.0.126.229 – 10.0.126.23010.0.126.231
5910.0.126.232/3010.0.126.233 – 10.0.126.23410.0.126.235
6010.0.126.236/3010.0.126.237 – 10.0.126.23810.0.126.239
6110.0.126.240/3010.0.126.241 – 10.0.126.24210.0.126.243
6210.0.126.244/3010.0.126.245 – 10.0.126.24610.0.126.247
6310.0.126.248/3010.0.126.249 – 10.0.126.25010.0.126.251
6410.0.126.252/3010.0.126.253 – 10.0.126.25410.0.126.255
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 →