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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)10.63.4.0/24
network10.63.4.0/24
broadcast10.63.4.255
first host10.63.4.1
last host10.63.4.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.63.4.0/24
address00001010.00111111.00000100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00111111.00000100.00000000
broadcast00001010.00111111.00000100.11111111
green = network part, grey = host part
hex0x0a3f0400
decimal171901952
reverse dns0.4.63.10.in-addr.arpa
ipv4-mapped::ffff:a3f:400

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.63.4.0/3010.63.4.1 – 10.63.4.210.63.4.3
210.63.4.4/3010.63.4.5 – 10.63.4.610.63.4.7
310.63.4.8/3010.63.4.9 – 10.63.4.1010.63.4.11
410.63.4.12/3010.63.4.13 – 10.63.4.1410.63.4.15
510.63.4.16/3010.63.4.17 – 10.63.4.1810.63.4.19
610.63.4.20/3010.63.4.21 – 10.63.4.2210.63.4.23
710.63.4.24/3010.63.4.25 – 10.63.4.2610.63.4.27
810.63.4.28/3010.63.4.29 – 10.63.4.3010.63.4.31
910.63.4.32/3010.63.4.33 – 10.63.4.3410.63.4.35
1010.63.4.36/3010.63.4.37 – 10.63.4.3810.63.4.39
1110.63.4.40/3010.63.4.41 – 10.63.4.4210.63.4.43
1210.63.4.44/3010.63.4.45 – 10.63.4.4610.63.4.47
1310.63.4.48/3010.63.4.49 – 10.63.4.5010.63.4.51
1410.63.4.52/3010.63.4.53 – 10.63.4.5410.63.4.55
1510.63.4.56/3010.63.4.57 – 10.63.4.5810.63.4.59
1610.63.4.60/3010.63.4.61 – 10.63.4.6210.63.4.63
1710.63.4.64/3010.63.4.65 – 10.63.4.6610.63.4.67
1810.63.4.68/3010.63.4.69 – 10.63.4.7010.63.4.71
1910.63.4.72/3010.63.4.73 – 10.63.4.7410.63.4.75
2010.63.4.76/3010.63.4.77 – 10.63.4.7810.63.4.79
2110.63.4.80/3010.63.4.81 – 10.63.4.8210.63.4.83
2210.63.4.84/3010.63.4.85 – 10.63.4.8610.63.4.87
2310.63.4.88/3010.63.4.89 – 10.63.4.9010.63.4.91
2410.63.4.92/3010.63.4.93 – 10.63.4.9410.63.4.95
2510.63.4.96/3010.63.4.97 – 10.63.4.9810.63.4.99
2610.63.4.100/3010.63.4.101 – 10.63.4.10210.63.4.103
2710.63.4.104/3010.63.4.105 – 10.63.4.10610.63.4.107
2810.63.4.108/3010.63.4.109 – 10.63.4.11010.63.4.111
2910.63.4.112/3010.63.4.113 – 10.63.4.11410.63.4.115
3010.63.4.116/3010.63.4.117 – 10.63.4.11810.63.4.119
3110.63.4.120/3010.63.4.121 – 10.63.4.12210.63.4.123
3210.63.4.124/3010.63.4.125 – 10.63.4.12610.63.4.127
3310.63.4.128/3010.63.4.129 – 10.63.4.13010.63.4.131
3410.63.4.132/3010.63.4.133 – 10.63.4.13410.63.4.135
3510.63.4.136/3010.63.4.137 – 10.63.4.13810.63.4.139
3610.63.4.140/3010.63.4.141 – 10.63.4.14210.63.4.143
3710.63.4.144/3010.63.4.145 – 10.63.4.14610.63.4.147
3810.63.4.148/3010.63.4.149 – 10.63.4.15010.63.4.151
3910.63.4.152/3010.63.4.153 – 10.63.4.15410.63.4.155
4010.63.4.156/3010.63.4.157 – 10.63.4.15810.63.4.159
4110.63.4.160/3010.63.4.161 – 10.63.4.16210.63.4.163
4210.63.4.164/3010.63.4.165 – 10.63.4.16610.63.4.167
4310.63.4.168/3010.63.4.169 – 10.63.4.17010.63.4.171
4410.63.4.172/3010.63.4.173 – 10.63.4.17410.63.4.175
4510.63.4.176/3010.63.4.177 – 10.63.4.17810.63.4.179
4610.63.4.180/3010.63.4.181 – 10.63.4.18210.63.4.183
4710.63.4.184/3010.63.4.185 – 10.63.4.18610.63.4.187
4810.63.4.188/3010.63.4.189 – 10.63.4.19010.63.4.191
4910.63.4.192/3010.63.4.193 – 10.63.4.19410.63.4.195
5010.63.4.196/3010.63.4.197 – 10.63.4.19810.63.4.199
5110.63.4.200/3010.63.4.201 – 10.63.4.20210.63.4.203
5210.63.4.204/3010.63.4.205 – 10.63.4.20610.63.4.207
5310.63.4.208/3010.63.4.209 – 10.63.4.21010.63.4.211
5410.63.4.212/3010.63.4.213 – 10.63.4.21410.63.4.215
5510.63.4.216/3010.63.4.217 – 10.63.4.21810.63.4.219
5610.63.4.220/3010.63.4.221 – 10.63.4.22210.63.4.223
5710.63.4.224/3010.63.4.225 – 10.63.4.22610.63.4.227
5810.63.4.228/3010.63.4.229 – 10.63.4.23010.63.4.231
5910.63.4.232/3010.63.4.233 – 10.63.4.23410.63.4.235
6010.63.4.236/3010.63.4.237 – 10.63.4.23810.63.4.239
6110.63.4.240/3010.63.4.241 – 10.63.4.24210.63.4.243
6210.63.4.244/3010.63.4.245 – 10.63.4.24610.63.4.247
6310.63.4.248/3010.63.4.249 – 10.63.4.25010.63.4.251
6410.63.4.252/3010.63.4.253 – 10.63.4.25410.63.4.255
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 →