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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)10.0.249.0/24
network10.0.249.0/24
broadcast10.0.249.255
first host10.0.249.1
last host10.0.249.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.249.0/24
address00001010.00000000.11111001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.11111001.00000000
broadcast00001010.00000000.11111001.11111111
green = network part, grey = host part
hex0x0a00f900
decimal167835904
reverse dns0.249.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:f900

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.249.0/3010.0.249.1 – 10.0.249.210.0.249.3
210.0.249.4/3010.0.249.5 – 10.0.249.610.0.249.7
310.0.249.8/3010.0.249.9 – 10.0.249.1010.0.249.11
410.0.249.12/3010.0.249.13 – 10.0.249.1410.0.249.15
510.0.249.16/3010.0.249.17 – 10.0.249.1810.0.249.19
610.0.249.20/3010.0.249.21 – 10.0.249.2210.0.249.23
710.0.249.24/3010.0.249.25 – 10.0.249.2610.0.249.27
810.0.249.28/3010.0.249.29 – 10.0.249.3010.0.249.31
910.0.249.32/3010.0.249.33 – 10.0.249.3410.0.249.35
1010.0.249.36/3010.0.249.37 – 10.0.249.3810.0.249.39
1110.0.249.40/3010.0.249.41 – 10.0.249.4210.0.249.43
1210.0.249.44/3010.0.249.45 – 10.0.249.4610.0.249.47
1310.0.249.48/3010.0.249.49 – 10.0.249.5010.0.249.51
1410.0.249.52/3010.0.249.53 – 10.0.249.5410.0.249.55
1510.0.249.56/3010.0.249.57 – 10.0.249.5810.0.249.59
1610.0.249.60/3010.0.249.61 – 10.0.249.6210.0.249.63
1710.0.249.64/3010.0.249.65 – 10.0.249.6610.0.249.67
1810.0.249.68/3010.0.249.69 – 10.0.249.7010.0.249.71
1910.0.249.72/3010.0.249.73 – 10.0.249.7410.0.249.75
2010.0.249.76/3010.0.249.77 – 10.0.249.7810.0.249.79
2110.0.249.80/3010.0.249.81 – 10.0.249.8210.0.249.83
2210.0.249.84/3010.0.249.85 – 10.0.249.8610.0.249.87
2310.0.249.88/3010.0.249.89 – 10.0.249.9010.0.249.91
2410.0.249.92/3010.0.249.93 – 10.0.249.9410.0.249.95
2510.0.249.96/3010.0.249.97 – 10.0.249.9810.0.249.99
2610.0.249.100/3010.0.249.101 – 10.0.249.10210.0.249.103
2710.0.249.104/3010.0.249.105 – 10.0.249.10610.0.249.107
2810.0.249.108/3010.0.249.109 – 10.0.249.11010.0.249.111
2910.0.249.112/3010.0.249.113 – 10.0.249.11410.0.249.115
3010.0.249.116/3010.0.249.117 – 10.0.249.11810.0.249.119
3110.0.249.120/3010.0.249.121 – 10.0.249.12210.0.249.123
3210.0.249.124/3010.0.249.125 – 10.0.249.12610.0.249.127
3310.0.249.128/3010.0.249.129 – 10.0.249.13010.0.249.131
3410.0.249.132/3010.0.249.133 – 10.0.249.13410.0.249.135
3510.0.249.136/3010.0.249.137 – 10.0.249.13810.0.249.139
3610.0.249.140/3010.0.249.141 – 10.0.249.14210.0.249.143
3710.0.249.144/3010.0.249.145 – 10.0.249.14610.0.249.147
3810.0.249.148/3010.0.249.149 – 10.0.249.15010.0.249.151
3910.0.249.152/3010.0.249.153 – 10.0.249.15410.0.249.155
4010.0.249.156/3010.0.249.157 – 10.0.249.15810.0.249.159
4110.0.249.160/3010.0.249.161 – 10.0.249.16210.0.249.163
4210.0.249.164/3010.0.249.165 – 10.0.249.16610.0.249.167
4310.0.249.168/3010.0.249.169 – 10.0.249.17010.0.249.171
4410.0.249.172/3010.0.249.173 – 10.0.249.17410.0.249.175
4510.0.249.176/3010.0.249.177 – 10.0.249.17810.0.249.179
4610.0.249.180/3010.0.249.181 – 10.0.249.18210.0.249.183
4710.0.249.184/3010.0.249.185 – 10.0.249.18610.0.249.187
4810.0.249.188/3010.0.249.189 – 10.0.249.19010.0.249.191
4910.0.249.192/3010.0.249.193 – 10.0.249.19410.0.249.195
5010.0.249.196/3010.0.249.197 – 10.0.249.19810.0.249.199
5110.0.249.200/3010.0.249.201 – 10.0.249.20210.0.249.203
5210.0.249.204/3010.0.249.205 – 10.0.249.20610.0.249.207
5310.0.249.208/3010.0.249.209 – 10.0.249.21010.0.249.211
5410.0.249.212/3010.0.249.213 – 10.0.249.21410.0.249.215
5510.0.249.216/3010.0.249.217 – 10.0.249.21810.0.249.219
5610.0.249.220/3010.0.249.221 – 10.0.249.22210.0.249.223
5710.0.249.224/3010.0.249.225 – 10.0.249.22610.0.249.227
5810.0.249.228/3010.0.249.229 – 10.0.249.23010.0.249.231
5910.0.249.232/3010.0.249.233 – 10.0.249.23410.0.249.235
6010.0.249.236/3010.0.249.237 – 10.0.249.23810.0.249.239
6110.0.249.240/3010.0.249.241 – 10.0.249.24210.0.249.243
6210.0.249.244/3010.0.249.245 – 10.0.249.24610.0.249.247
6310.0.249.248/3010.0.249.249 – 10.0.249.25010.0.249.251
6410.0.249.252/3010.0.249.253 – 10.0.249.25410.0.249.255
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 →