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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)10.4.121.0/24
network10.4.121.0/24
broadcast10.4.121.255
first host10.4.121.1
last host10.4.121.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.4.121.0/24
address00001010.00000100.01111001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000100.01111001.00000000
broadcast00001010.00000100.01111001.11111111
green = network part, grey = host part
hex0x0a047900
decimal168065280
reverse dns0.121.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:7900

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.121.0/3010.4.121.1 – 10.4.121.210.4.121.3
210.4.121.4/3010.4.121.5 – 10.4.121.610.4.121.7
310.4.121.8/3010.4.121.9 – 10.4.121.1010.4.121.11
410.4.121.12/3010.4.121.13 – 10.4.121.1410.4.121.15
510.4.121.16/3010.4.121.17 – 10.4.121.1810.4.121.19
610.4.121.20/3010.4.121.21 – 10.4.121.2210.4.121.23
710.4.121.24/3010.4.121.25 – 10.4.121.2610.4.121.27
810.4.121.28/3010.4.121.29 – 10.4.121.3010.4.121.31
910.4.121.32/3010.4.121.33 – 10.4.121.3410.4.121.35
1010.4.121.36/3010.4.121.37 – 10.4.121.3810.4.121.39
1110.4.121.40/3010.4.121.41 – 10.4.121.4210.4.121.43
1210.4.121.44/3010.4.121.45 – 10.4.121.4610.4.121.47
1310.4.121.48/3010.4.121.49 – 10.4.121.5010.4.121.51
1410.4.121.52/3010.4.121.53 – 10.4.121.5410.4.121.55
1510.4.121.56/3010.4.121.57 – 10.4.121.5810.4.121.59
1610.4.121.60/3010.4.121.61 – 10.4.121.6210.4.121.63
1710.4.121.64/3010.4.121.65 – 10.4.121.6610.4.121.67
1810.4.121.68/3010.4.121.69 – 10.4.121.7010.4.121.71
1910.4.121.72/3010.4.121.73 – 10.4.121.7410.4.121.75
2010.4.121.76/3010.4.121.77 – 10.4.121.7810.4.121.79
2110.4.121.80/3010.4.121.81 – 10.4.121.8210.4.121.83
2210.4.121.84/3010.4.121.85 – 10.4.121.8610.4.121.87
2310.4.121.88/3010.4.121.89 – 10.4.121.9010.4.121.91
2410.4.121.92/3010.4.121.93 – 10.4.121.9410.4.121.95
2510.4.121.96/3010.4.121.97 – 10.4.121.9810.4.121.99
2610.4.121.100/3010.4.121.101 – 10.4.121.10210.4.121.103
2710.4.121.104/3010.4.121.105 – 10.4.121.10610.4.121.107
2810.4.121.108/3010.4.121.109 – 10.4.121.11010.4.121.111
2910.4.121.112/3010.4.121.113 – 10.4.121.11410.4.121.115
3010.4.121.116/3010.4.121.117 – 10.4.121.11810.4.121.119
3110.4.121.120/3010.4.121.121 – 10.4.121.12210.4.121.123
3210.4.121.124/3010.4.121.125 – 10.4.121.12610.4.121.127
3310.4.121.128/3010.4.121.129 – 10.4.121.13010.4.121.131
3410.4.121.132/3010.4.121.133 – 10.4.121.13410.4.121.135
3510.4.121.136/3010.4.121.137 – 10.4.121.13810.4.121.139
3610.4.121.140/3010.4.121.141 – 10.4.121.14210.4.121.143
3710.4.121.144/3010.4.121.145 – 10.4.121.14610.4.121.147
3810.4.121.148/3010.4.121.149 – 10.4.121.15010.4.121.151
3910.4.121.152/3010.4.121.153 – 10.4.121.15410.4.121.155
4010.4.121.156/3010.4.121.157 – 10.4.121.15810.4.121.159
4110.4.121.160/3010.4.121.161 – 10.4.121.16210.4.121.163
4210.4.121.164/3010.4.121.165 – 10.4.121.16610.4.121.167
4310.4.121.168/3010.4.121.169 – 10.4.121.17010.4.121.171
4410.4.121.172/3010.4.121.173 – 10.4.121.17410.4.121.175
4510.4.121.176/3010.4.121.177 – 10.4.121.17810.4.121.179
4610.4.121.180/3010.4.121.181 – 10.4.121.18210.4.121.183
4710.4.121.184/3010.4.121.185 – 10.4.121.18610.4.121.187
4810.4.121.188/3010.4.121.189 – 10.4.121.19010.4.121.191
4910.4.121.192/3010.4.121.193 – 10.4.121.19410.4.121.195
5010.4.121.196/3010.4.121.197 – 10.4.121.19810.4.121.199
5110.4.121.200/3010.4.121.201 – 10.4.121.20210.4.121.203
5210.4.121.204/3010.4.121.205 – 10.4.121.20610.4.121.207
5310.4.121.208/3010.4.121.209 – 10.4.121.21010.4.121.211
5410.4.121.212/3010.4.121.213 – 10.4.121.21410.4.121.215
5510.4.121.216/3010.4.121.217 – 10.4.121.21810.4.121.219
5610.4.121.220/3010.4.121.221 – 10.4.121.22210.4.121.223
5710.4.121.224/3010.4.121.225 – 10.4.121.22610.4.121.227
5810.4.121.228/3010.4.121.229 – 10.4.121.23010.4.121.231
5910.4.121.232/3010.4.121.233 – 10.4.121.23410.4.121.235
6010.4.121.236/3010.4.121.237 – 10.4.121.23810.4.121.239
6110.4.121.240/3010.4.121.241 – 10.4.121.24210.4.121.243
6210.4.121.244/3010.4.121.245 – 10.4.121.24610.4.121.247
6310.4.121.248/3010.4.121.249 – 10.4.121.25010.4.121.251
6410.4.121.252/3010.4.121.253 – 10.4.121.25410.4.121.255
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 →