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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)10.121.3.0/24
network10.121.3.0/24
broadcast10.121.3.255
first host10.121.3.1
last host10.121.3.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.121.3.0/24
address00001010.01111001.00000011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01111001.00000011.00000000
broadcast00001010.01111001.00000011.11111111
green = network part, grey = host part
hex0x0a790300
decimal175702784
reverse dns0.3.121.10.in-addr.arpa
ipv4-mapped::ffff:a79:300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.121.3.0/3010.121.3.1 – 10.121.3.210.121.3.3
210.121.3.4/3010.121.3.5 – 10.121.3.610.121.3.7
310.121.3.8/3010.121.3.9 – 10.121.3.1010.121.3.11
410.121.3.12/3010.121.3.13 – 10.121.3.1410.121.3.15
510.121.3.16/3010.121.3.17 – 10.121.3.1810.121.3.19
610.121.3.20/3010.121.3.21 – 10.121.3.2210.121.3.23
710.121.3.24/3010.121.3.25 – 10.121.3.2610.121.3.27
810.121.3.28/3010.121.3.29 – 10.121.3.3010.121.3.31
910.121.3.32/3010.121.3.33 – 10.121.3.3410.121.3.35
1010.121.3.36/3010.121.3.37 – 10.121.3.3810.121.3.39
1110.121.3.40/3010.121.3.41 – 10.121.3.4210.121.3.43
1210.121.3.44/3010.121.3.45 – 10.121.3.4610.121.3.47
1310.121.3.48/3010.121.3.49 – 10.121.3.5010.121.3.51
1410.121.3.52/3010.121.3.53 – 10.121.3.5410.121.3.55
1510.121.3.56/3010.121.3.57 – 10.121.3.5810.121.3.59
1610.121.3.60/3010.121.3.61 – 10.121.3.6210.121.3.63
1710.121.3.64/3010.121.3.65 – 10.121.3.6610.121.3.67
1810.121.3.68/3010.121.3.69 – 10.121.3.7010.121.3.71
1910.121.3.72/3010.121.3.73 – 10.121.3.7410.121.3.75
2010.121.3.76/3010.121.3.77 – 10.121.3.7810.121.3.79
2110.121.3.80/3010.121.3.81 – 10.121.3.8210.121.3.83
2210.121.3.84/3010.121.3.85 – 10.121.3.8610.121.3.87
2310.121.3.88/3010.121.3.89 – 10.121.3.9010.121.3.91
2410.121.3.92/3010.121.3.93 – 10.121.3.9410.121.3.95
2510.121.3.96/3010.121.3.97 – 10.121.3.9810.121.3.99
2610.121.3.100/3010.121.3.101 – 10.121.3.10210.121.3.103
2710.121.3.104/3010.121.3.105 – 10.121.3.10610.121.3.107
2810.121.3.108/3010.121.3.109 – 10.121.3.11010.121.3.111
2910.121.3.112/3010.121.3.113 – 10.121.3.11410.121.3.115
3010.121.3.116/3010.121.3.117 – 10.121.3.11810.121.3.119
3110.121.3.120/3010.121.3.121 – 10.121.3.12210.121.3.123
3210.121.3.124/3010.121.3.125 – 10.121.3.12610.121.3.127
3310.121.3.128/3010.121.3.129 – 10.121.3.13010.121.3.131
3410.121.3.132/3010.121.3.133 – 10.121.3.13410.121.3.135
3510.121.3.136/3010.121.3.137 – 10.121.3.13810.121.3.139
3610.121.3.140/3010.121.3.141 – 10.121.3.14210.121.3.143
3710.121.3.144/3010.121.3.145 – 10.121.3.14610.121.3.147
3810.121.3.148/3010.121.3.149 – 10.121.3.15010.121.3.151
3910.121.3.152/3010.121.3.153 – 10.121.3.15410.121.3.155
4010.121.3.156/3010.121.3.157 – 10.121.3.15810.121.3.159
4110.121.3.160/3010.121.3.161 – 10.121.3.16210.121.3.163
4210.121.3.164/3010.121.3.165 – 10.121.3.16610.121.3.167
4310.121.3.168/3010.121.3.169 – 10.121.3.17010.121.3.171
4410.121.3.172/3010.121.3.173 – 10.121.3.17410.121.3.175
4510.121.3.176/3010.121.3.177 – 10.121.3.17810.121.3.179
4610.121.3.180/3010.121.3.181 – 10.121.3.18210.121.3.183
4710.121.3.184/3010.121.3.185 – 10.121.3.18610.121.3.187
4810.121.3.188/3010.121.3.189 – 10.121.3.19010.121.3.191
4910.121.3.192/3010.121.3.193 – 10.121.3.19410.121.3.195
5010.121.3.196/3010.121.3.197 – 10.121.3.19810.121.3.199
5110.121.3.200/3010.121.3.201 – 10.121.3.20210.121.3.203
5210.121.3.204/3010.121.3.205 – 10.121.3.20610.121.3.207
5310.121.3.208/3010.121.3.209 – 10.121.3.21010.121.3.211
5410.121.3.212/3010.121.3.213 – 10.121.3.21410.121.3.215
5510.121.3.216/3010.121.3.217 – 10.121.3.21810.121.3.219
5610.121.3.220/3010.121.3.221 – 10.121.3.22210.121.3.223
5710.121.3.224/3010.121.3.225 – 10.121.3.22610.121.3.227
5810.121.3.228/3010.121.3.229 – 10.121.3.23010.121.3.231
5910.121.3.232/3010.121.3.233 – 10.121.3.23410.121.3.235
6010.121.3.236/3010.121.3.237 – 10.121.3.23810.121.3.239
6110.121.3.240/3010.121.3.241 – 10.121.3.24210.121.3.243
6210.121.3.244/3010.121.3.245 – 10.121.3.24610.121.3.247
6310.121.3.248/3010.121.3.249 – 10.121.3.25010.121.3.251
6410.121.3.252/3010.121.3.253 – 10.121.3.25410.121.3.255
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 →