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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)10.45.19.0/24
network10.45.19.0/24
broadcast10.45.19.255
first host10.45.19.1
last host10.45.19.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.19.0/24
address00001010.00101101.00010011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.00010011.00000000
broadcast00001010.00101101.00010011.11111111
green = network part, grey = host part
hex0x0a2d1300
decimal170726144
reverse dns0.19.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:1300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.19.0/3010.45.19.1 – 10.45.19.210.45.19.3
210.45.19.4/3010.45.19.5 – 10.45.19.610.45.19.7
310.45.19.8/3010.45.19.9 – 10.45.19.1010.45.19.11
410.45.19.12/3010.45.19.13 – 10.45.19.1410.45.19.15
510.45.19.16/3010.45.19.17 – 10.45.19.1810.45.19.19
610.45.19.20/3010.45.19.21 – 10.45.19.2210.45.19.23
710.45.19.24/3010.45.19.25 – 10.45.19.2610.45.19.27
810.45.19.28/3010.45.19.29 – 10.45.19.3010.45.19.31
910.45.19.32/3010.45.19.33 – 10.45.19.3410.45.19.35
1010.45.19.36/3010.45.19.37 – 10.45.19.3810.45.19.39
1110.45.19.40/3010.45.19.41 – 10.45.19.4210.45.19.43
1210.45.19.44/3010.45.19.45 – 10.45.19.4610.45.19.47
1310.45.19.48/3010.45.19.49 – 10.45.19.5010.45.19.51
1410.45.19.52/3010.45.19.53 – 10.45.19.5410.45.19.55
1510.45.19.56/3010.45.19.57 – 10.45.19.5810.45.19.59
1610.45.19.60/3010.45.19.61 – 10.45.19.6210.45.19.63
1710.45.19.64/3010.45.19.65 – 10.45.19.6610.45.19.67
1810.45.19.68/3010.45.19.69 – 10.45.19.7010.45.19.71
1910.45.19.72/3010.45.19.73 – 10.45.19.7410.45.19.75
2010.45.19.76/3010.45.19.77 – 10.45.19.7810.45.19.79
2110.45.19.80/3010.45.19.81 – 10.45.19.8210.45.19.83
2210.45.19.84/3010.45.19.85 – 10.45.19.8610.45.19.87
2310.45.19.88/3010.45.19.89 – 10.45.19.9010.45.19.91
2410.45.19.92/3010.45.19.93 – 10.45.19.9410.45.19.95
2510.45.19.96/3010.45.19.97 – 10.45.19.9810.45.19.99
2610.45.19.100/3010.45.19.101 – 10.45.19.10210.45.19.103
2710.45.19.104/3010.45.19.105 – 10.45.19.10610.45.19.107
2810.45.19.108/3010.45.19.109 – 10.45.19.11010.45.19.111
2910.45.19.112/3010.45.19.113 – 10.45.19.11410.45.19.115
3010.45.19.116/3010.45.19.117 – 10.45.19.11810.45.19.119
3110.45.19.120/3010.45.19.121 – 10.45.19.12210.45.19.123
3210.45.19.124/3010.45.19.125 – 10.45.19.12610.45.19.127
3310.45.19.128/3010.45.19.129 – 10.45.19.13010.45.19.131
3410.45.19.132/3010.45.19.133 – 10.45.19.13410.45.19.135
3510.45.19.136/3010.45.19.137 – 10.45.19.13810.45.19.139
3610.45.19.140/3010.45.19.141 – 10.45.19.14210.45.19.143
3710.45.19.144/3010.45.19.145 – 10.45.19.14610.45.19.147
3810.45.19.148/3010.45.19.149 – 10.45.19.15010.45.19.151
3910.45.19.152/3010.45.19.153 – 10.45.19.15410.45.19.155
4010.45.19.156/3010.45.19.157 – 10.45.19.15810.45.19.159
4110.45.19.160/3010.45.19.161 – 10.45.19.16210.45.19.163
4210.45.19.164/3010.45.19.165 – 10.45.19.16610.45.19.167
4310.45.19.168/3010.45.19.169 – 10.45.19.17010.45.19.171
4410.45.19.172/3010.45.19.173 – 10.45.19.17410.45.19.175
4510.45.19.176/3010.45.19.177 – 10.45.19.17810.45.19.179
4610.45.19.180/3010.45.19.181 – 10.45.19.18210.45.19.183
4710.45.19.184/3010.45.19.185 – 10.45.19.18610.45.19.187
4810.45.19.188/3010.45.19.189 – 10.45.19.19010.45.19.191
4910.45.19.192/3010.45.19.193 – 10.45.19.19410.45.19.195
5010.45.19.196/3010.45.19.197 – 10.45.19.19810.45.19.199
5110.45.19.200/3010.45.19.201 – 10.45.19.20210.45.19.203
5210.45.19.204/3010.45.19.205 – 10.45.19.20610.45.19.207
5310.45.19.208/3010.45.19.209 – 10.45.19.21010.45.19.211
5410.45.19.212/3010.45.19.213 – 10.45.19.21410.45.19.215
5510.45.19.216/3010.45.19.217 – 10.45.19.21810.45.19.219
5610.45.19.220/3010.45.19.221 – 10.45.19.22210.45.19.223
5710.45.19.224/3010.45.19.225 – 10.45.19.22610.45.19.227
5810.45.19.228/3010.45.19.229 – 10.45.19.23010.45.19.231
5910.45.19.232/3010.45.19.233 – 10.45.19.23410.45.19.235
6010.45.19.236/3010.45.19.237 – 10.45.19.23810.45.19.239
6110.45.19.240/3010.45.19.241 – 10.45.19.24210.45.19.243
6210.45.19.244/3010.45.19.245 – 10.45.19.24610.45.19.247
6310.45.19.248/3010.45.19.249 – 10.45.19.25010.45.19.251
6410.45.19.252/3010.45.19.253 – 10.45.19.25410.45.19.255
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 →