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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)10.239.49.0/24
network10.239.49.0/24
broadcast10.239.49.255
first host10.239.49.1
last host10.239.49.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.239.49.0/24
address00001010.11101111.00110001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.11101111.00110001.00000000
broadcast00001010.11101111.00110001.11111111
green = network part, grey = host part
hex0x0aef3100
decimal183447808
reverse dns0.49.239.10.in-addr.arpa
ipv4-mapped::ffff:aef:3100

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.239.49.0/3010.239.49.1 – 10.239.49.210.239.49.3
210.239.49.4/3010.239.49.5 – 10.239.49.610.239.49.7
310.239.49.8/3010.239.49.9 – 10.239.49.1010.239.49.11
410.239.49.12/3010.239.49.13 – 10.239.49.1410.239.49.15
510.239.49.16/3010.239.49.17 – 10.239.49.1810.239.49.19
610.239.49.20/3010.239.49.21 – 10.239.49.2210.239.49.23
710.239.49.24/3010.239.49.25 – 10.239.49.2610.239.49.27
810.239.49.28/3010.239.49.29 – 10.239.49.3010.239.49.31
910.239.49.32/3010.239.49.33 – 10.239.49.3410.239.49.35
1010.239.49.36/3010.239.49.37 – 10.239.49.3810.239.49.39
1110.239.49.40/3010.239.49.41 – 10.239.49.4210.239.49.43
1210.239.49.44/3010.239.49.45 – 10.239.49.4610.239.49.47
1310.239.49.48/3010.239.49.49 – 10.239.49.5010.239.49.51
1410.239.49.52/3010.239.49.53 – 10.239.49.5410.239.49.55
1510.239.49.56/3010.239.49.57 – 10.239.49.5810.239.49.59
1610.239.49.60/3010.239.49.61 – 10.239.49.6210.239.49.63
1710.239.49.64/3010.239.49.65 – 10.239.49.6610.239.49.67
1810.239.49.68/3010.239.49.69 – 10.239.49.7010.239.49.71
1910.239.49.72/3010.239.49.73 – 10.239.49.7410.239.49.75
2010.239.49.76/3010.239.49.77 – 10.239.49.7810.239.49.79
2110.239.49.80/3010.239.49.81 – 10.239.49.8210.239.49.83
2210.239.49.84/3010.239.49.85 – 10.239.49.8610.239.49.87
2310.239.49.88/3010.239.49.89 – 10.239.49.9010.239.49.91
2410.239.49.92/3010.239.49.93 – 10.239.49.9410.239.49.95
2510.239.49.96/3010.239.49.97 – 10.239.49.9810.239.49.99
2610.239.49.100/3010.239.49.101 – 10.239.49.10210.239.49.103
2710.239.49.104/3010.239.49.105 – 10.239.49.10610.239.49.107
2810.239.49.108/3010.239.49.109 – 10.239.49.11010.239.49.111
2910.239.49.112/3010.239.49.113 – 10.239.49.11410.239.49.115
3010.239.49.116/3010.239.49.117 – 10.239.49.11810.239.49.119
3110.239.49.120/3010.239.49.121 – 10.239.49.12210.239.49.123
3210.239.49.124/3010.239.49.125 – 10.239.49.12610.239.49.127
3310.239.49.128/3010.239.49.129 – 10.239.49.13010.239.49.131
3410.239.49.132/3010.239.49.133 – 10.239.49.13410.239.49.135
3510.239.49.136/3010.239.49.137 – 10.239.49.13810.239.49.139
3610.239.49.140/3010.239.49.141 – 10.239.49.14210.239.49.143
3710.239.49.144/3010.239.49.145 – 10.239.49.14610.239.49.147
3810.239.49.148/3010.239.49.149 – 10.239.49.15010.239.49.151
3910.239.49.152/3010.239.49.153 – 10.239.49.15410.239.49.155
4010.239.49.156/3010.239.49.157 – 10.239.49.15810.239.49.159
4110.239.49.160/3010.239.49.161 – 10.239.49.16210.239.49.163
4210.239.49.164/3010.239.49.165 – 10.239.49.16610.239.49.167
4310.239.49.168/3010.239.49.169 – 10.239.49.17010.239.49.171
4410.239.49.172/3010.239.49.173 – 10.239.49.17410.239.49.175
4510.239.49.176/3010.239.49.177 – 10.239.49.17810.239.49.179
4610.239.49.180/3010.239.49.181 – 10.239.49.18210.239.49.183
4710.239.49.184/3010.239.49.185 – 10.239.49.18610.239.49.187
4810.239.49.188/3010.239.49.189 – 10.239.49.19010.239.49.191
4910.239.49.192/3010.239.49.193 – 10.239.49.19410.239.49.195
5010.239.49.196/3010.239.49.197 – 10.239.49.19810.239.49.199
5110.239.49.200/3010.239.49.201 – 10.239.49.20210.239.49.203
5210.239.49.204/3010.239.49.205 – 10.239.49.20610.239.49.207
5310.239.49.208/3010.239.49.209 – 10.239.49.21010.239.49.211
5410.239.49.212/3010.239.49.213 – 10.239.49.21410.239.49.215
5510.239.49.216/3010.239.49.217 – 10.239.49.21810.239.49.219
5610.239.49.220/3010.239.49.221 – 10.239.49.22210.239.49.223
5710.239.49.224/3010.239.49.225 – 10.239.49.22610.239.49.227
5810.239.49.228/3010.239.49.229 – 10.239.49.23010.239.49.231
5910.239.49.232/3010.239.49.233 – 10.239.49.23410.239.49.235
6010.239.49.236/3010.239.49.237 – 10.239.49.23810.239.49.239
6110.239.49.240/3010.239.49.241 – 10.239.49.24210.239.49.243
6210.239.49.244/3010.239.49.245 – 10.239.49.24610.239.49.247
6310.239.49.248/3010.239.49.249 – 10.239.49.25010.239.49.251
6410.239.49.252/3010.239.49.253 – 10.239.49.25410.239.49.255
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 →