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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)10.4.181.0/24
network10.4.181.0/24
broadcast10.4.181.255
first host10.4.181.1
last host10.4.181.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.4.181.0/24
address00001010.00000100.10110101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000100.10110101.00000000
broadcast00001010.00000100.10110101.11111111
green = network part, grey = host part
hex0x0a04b500
decimal168080640
reverse dns0.181.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:b500

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.181.0/3010.4.181.1 – 10.4.181.210.4.181.3
210.4.181.4/3010.4.181.5 – 10.4.181.610.4.181.7
310.4.181.8/3010.4.181.9 – 10.4.181.1010.4.181.11
410.4.181.12/3010.4.181.13 – 10.4.181.1410.4.181.15
510.4.181.16/3010.4.181.17 – 10.4.181.1810.4.181.19
610.4.181.20/3010.4.181.21 – 10.4.181.2210.4.181.23
710.4.181.24/3010.4.181.25 – 10.4.181.2610.4.181.27
810.4.181.28/3010.4.181.29 – 10.4.181.3010.4.181.31
910.4.181.32/3010.4.181.33 – 10.4.181.3410.4.181.35
1010.4.181.36/3010.4.181.37 – 10.4.181.3810.4.181.39
1110.4.181.40/3010.4.181.41 – 10.4.181.4210.4.181.43
1210.4.181.44/3010.4.181.45 – 10.4.181.4610.4.181.47
1310.4.181.48/3010.4.181.49 – 10.4.181.5010.4.181.51
1410.4.181.52/3010.4.181.53 – 10.4.181.5410.4.181.55
1510.4.181.56/3010.4.181.57 – 10.4.181.5810.4.181.59
1610.4.181.60/3010.4.181.61 – 10.4.181.6210.4.181.63
1710.4.181.64/3010.4.181.65 – 10.4.181.6610.4.181.67
1810.4.181.68/3010.4.181.69 – 10.4.181.7010.4.181.71
1910.4.181.72/3010.4.181.73 – 10.4.181.7410.4.181.75
2010.4.181.76/3010.4.181.77 – 10.4.181.7810.4.181.79
2110.4.181.80/3010.4.181.81 – 10.4.181.8210.4.181.83
2210.4.181.84/3010.4.181.85 – 10.4.181.8610.4.181.87
2310.4.181.88/3010.4.181.89 – 10.4.181.9010.4.181.91
2410.4.181.92/3010.4.181.93 – 10.4.181.9410.4.181.95
2510.4.181.96/3010.4.181.97 – 10.4.181.9810.4.181.99
2610.4.181.100/3010.4.181.101 – 10.4.181.10210.4.181.103
2710.4.181.104/3010.4.181.105 – 10.4.181.10610.4.181.107
2810.4.181.108/3010.4.181.109 – 10.4.181.11010.4.181.111
2910.4.181.112/3010.4.181.113 – 10.4.181.11410.4.181.115
3010.4.181.116/3010.4.181.117 – 10.4.181.11810.4.181.119
3110.4.181.120/3010.4.181.121 – 10.4.181.12210.4.181.123
3210.4.181.124/3010.4.181.125 – 10.4.181.12610.4.181.127
3310.4.181.128/3010.4.181.129 – 10.4.181.13010.4.181.131
3410.4.181.132/3010.4.181.133 – 10.4.181.13410.4.181.135
3510.4.181.136/3010.4.181.137 – 10.4.181.13810.4.181.139
3610.4.181.140/3010.4.181.141 – 10.4.181.14210.4.181.143
3710.4.181.144/3010.4.181.145 – 10.4.181.14610.4.181.147
3810.4.181.148/3010.4.181.149 – 10.4.181.15010.4.181.151
3910.4.181.152/3010.4.181.153 – 10.4.181.15410.4.181.155
4010.4.181.156/3010.4.181.157 – 10.4.181.15810.4.181.159
4110.4.181.160/3010.4.181.161 – 10.4.181.16210.4.181.163
4210.4.181.164/3010.4.181.165 – 10.4.181.16610.4.181.167
4310.4.181.168/3010.4.181.169 – 10.4.181.17010.4.181.171
4410.4.181.172/3010.4.181.173 – 10.4.181.17410.4.181.175
4510.4.181.176/3010.4.181.177 – 10.4.181.17810.4.181.179
4610.4.181.180/3010.4.181.181 – 10.4.181.18210.4.181.183
4710.4.181.184/3010.4.181.185 – 10.4.181.18610.4.181.187
4810.4.181.188/3010.4.181.189 – 10.4.181.19010.4.181.191
4910.4.181.192/3010.4.181.193 – 10.4.181.19410.4.181.195
5010.4.181.196/3010.4.181.197 – 10.4.181.19810.4.181.199
5110.4.181.200/3010.4.181.201 – 10.4.181.20210.4.181.203
5210.4.181.204/3010.4.181.205 – 10.4.181.20610.4.181.207
5310.4.181.208/3010.4.181.209 – 10.4.181.21010.4.181.211
5410.4.181.212/3010.4.181.213 – 10.4.181.21410.4.181.215
5510.4.181.216/3010.4.181.217 – 10.4.181.21810.4.181.219
5610.4.181.220/3010.4.181.221 – 10.4.181.22210.4.181.223
5710.4.181.224/3010.4.181.225 – 10.4.181.22610.4.181.227
5810.4.181.228/3010.4.181.229 – 10.4.181.23010.4.181.231
5910.4.181.232/3010.4.181.233 – 10.4.181.23410.4.181.235
6010.4.181.236/3010.4.181.237 – 10.4.181.23810.4.181.239
6110.4.181.240/3010.4.181.241 – 10.4.181.24210.4.181.243
6210.4.181.244/3010.4.181.245 – 10.4.181.24610.4.181.247
6310.4.181.248/3010.4.181.249 – 10.4.181.25010.4.181.251
6410.4.181.252/3010.4.181.253 – 10.4.181.25410.4.181.255
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 →