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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)10.45.243.0/24
network10.45.243.0/24
broadcast10.45.243.255
first host10.45.243.1
last host10.45.243.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.243.0/24
address00001010.00101101.11110011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.11110011.00000000
broadcast00001010.00101101.11110011.11111111
green = network part, grey = host part
hex0x0a2df300
decimal170783488
reverse dns0.243.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:f300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.243.0/3010.45.243.1 – 10.45.243.210.45.243.3
210.45.243.4/3010.45.243.5 – 10.45.243.610.45.243.7
310.45.243.8/3010.45.243.9 – 10.45.243.1010.45.243.11
410.45.243.12/3010.45.243.13 – 10.45.243.1410.45.243.15
510.45.243.16/3010.45.243.17 – 10.45.243.1810.45.243.19
610.45.243.20/3010.45.243.21 – 10.45.243.2210.45.243.23
710.45.243.24/3010.45.243.25 – 10.45.243.2610.45.243.27
810.45.243.28/3010.45.243.29 – 10.45.243.3010.45.243.31
910.45.243.32/3010.45.243.33 – 10.45.243.3410.45.243.35
1010.45.243.36/3010.45.243.37 – 10.45.243.3810.45.243.39
1110.45.243.40/3010.45.243.41 – 10.45.243.4210.45.243.43
1210.45.243.44/3010.45.243.45 – 10.45.243.4610.45.243.47
1310.45.243.48/3010.45.243.49 – 10.45.243.5010.45.243.51
1410.45.243.52/3010.45.243.53 – 10.45.243.5410.45.243.55
1510.45.243.56/3010.45.243.57 – 10.45.243.5810.45.243.59
1610.45.243.60/3010.45.243.61 – 10.45.243.6210.45.243.63
1710.45.243.64/3010.45.243.65 – 10.45.243.6610.45.243.67
1810.45.243.68/3010.45.243.69 – 10.45.243.7010.45.243.71
1910.45.243.72/3010.45.243.73 – 10.45.243.7410.45.243.75
2010.45.243.76/3010.45.243.77 – 10.45.243.7810.45.243.79
2110.45.243.80/3010.45.243.81 – 10.45.243.8210.45.243.83
2210.45.243.84/3010.45.243.85 – 10.45.243.8610.45.243.87
2310.45.243.88/3010.45.243.89 – 10.45.243.9010.45.243.91
2410.45.243.92/3010.45.243.93 – 10.45.243.9410.45.243.95
2510.45.243.96/3010.45.243.97 – 10.45.243.9810.45.243.99
2610.45.243.100/3010.45.243.101 – 10.45.243.10210.45.243.103
2710.45.243.104/3010.45.243.105 – 10.45.243.10610.45.243.107
2810.45.243.108/3010.45.243.109 – 10.45.243.11010.45.243.111
2910.45.243.112/3010.45.243.113 – 10.45.243.11410.45.243.115
3010.45.243.116/3010.45.243.117 – 10.45.243.11810.45.243.119
3110.45.243.120/3010.45.243.121 – 10.45.243.12210.45.243.123
3210.45.243.124/3010.45.243.125 – 10.45.243.12610.45.243.127
3310.45.243.128/3010.45.243.129 – 10.45.243.13010.45.243.131
3410.45.243.132/3010.45.243.133 – 10.45.243.13410.45.243.135
3510.45.243.136/3010.45.243.137 – 10.45.243.13810.45.243.139
3610.45.243.140/3010.45.243.141 – 10.45.243.14210.45.243.143
3710.45.243.144/3010.45.243.145 – 10.45.243.14610.45.243.147
3810.45.243.148/3010.45.243.149 – 10.45.243.15010.45.243.151
3910.45.243.152/3010.45.243.153 – 10.45.243.15410.45.243.155
4010.45.243.156/3010.45.243.157 – 10.45.243.15810.45.243.159
4110.45.243.160/3010.45.243.161 – 10.45.243.16210.45.243.163
4210.45.243.164/3010.45.243.165 – 10.45.243.16610.45.243.167
4310.45.243.168/3010.45.243.169 – 10.45.243.17010.45.243.171
4410.45.243.172/3010.45.243.173 – 10.45.243.17410.45.243.175
4510.45.243.176/3010.45.243.177 – 10.45.243.17810.45.243.179
4610.45.243.180/3010.45.243.181 – 10.45.243.18210.45.243.183
4710.45.243.184/3010.45.243.185 – 10.45.243.18610.45.243.187
4810.45.243.188/3010.45.243.189 – 10.45.243.19010.45.243.191
4910.45.243.192/3010.45.243.193 – 10.45.243.19410.45.243.195
5010.45.243.196/3010.45.243.197 – 10.45.243.19810.45.243.199
5110.45.243.200/3010.45.243.201 – 10.45.243.20210.45.243.203
5210.45.243.204/3010.45.243.205 – 10.45.243.20610.45.243.207
5310.45.243.208/3010.45.243.209 – 10.45.243.21010.45.243.211
5410.45.243.212/3010.45.243.213 – 10.45.243.21410.45.243.215
5510.45.243.216/3010.45.243.217 – 10.45.243.21810.45.243.219
5610.45.243.220/3010.45.243.221 – 10.45.243.22210.45.243.223
5710.45.243.224/3010.45.243.225 – 10.45.243.22610.45.243.227
5810.45.243.228/3010.45.243.229 – 10.45.243.23010.45.243.231
5910.45.243.232/3010.45.243.233 – 10.45.243.23410.45.243.235
6010.45.243.236/3010.45.243.237 – 10.45.243.23810.45.243.239
6110.45.243.240/3010.45.243.241 – 10.45.243.24210.45.243.243
6210.45.243.244/3010.45.243.245 – 10.45.243.24610.45.243.247
6310.45.243.248/3010.45.243.249 – 10.45.243.25010.45.243.251
6410.45.243.252/3010.45.243.253 – 10.45.243.25410.45.243.255
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 →