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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)10.45.185.0/24
network10.45.185.0/24
broadcast10.45.185.255
first host10.45.185.1
last host10.45.185.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.185.0/24
address00001010.00101101.10111001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.10111001.00000000
broadcast00001010.00101101.10111001.11111111
green = network part, grey = host part
hex0x0a2db900
decimal170768640
reverse dns0.185.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:b900

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.185.0/3010.45.185.1 – 10.45.185.210.45.185.3
210.45.185.4/3010.45.185.5 – 10.45.185.610.45.185.7
310.45.185.8/3010.45.185.9 – 10.45.185.1010.45.185.11
410.45.185.12/3010.45.185.13 – 10.45.185.1410.45.185.15
510.45.185.16/3010.45.185.17 – 10.45.185.1810.45.185.19
610.45.185.20/3010.45.185.21 – 10.45.185.2210.45.185.23
710.45.185.24/3010.45.185.25 – 10.45.185.2610.45.185.27
810.45.185.28/3010.45.185.29 – 10.45.185.3010.45.185.31
910.45.185.32/3010.45.185.33 – 10.45.185.3410.45.185.35
1010.45.185.36/3010.45.185.37 – 10.45.185.3810.45.185.39
1110.45.185.40/3010.45.185.41 – 10.45.185.4210.45.185.43
1210.45.185.44/3010.45.185.45 – 10.45.185.4610.45.185.47
1310.45.185.48/3010.45.185.49 – 10.45.185.5010.45.185.51
1410.45.185.52/3010.45.185.53 – 10.45.185.5410.45.185.55
1510.45.185.56/3010.45.185.57 – 10.45.185.5810.45.185.59
1610.45.185.60/3010.45.185.61 – 10.45.185.6210.45.185.63
1710.45.185.64/3010.45.185.65 – 10.45.185.6610.45.185.67
1810.45.185.68/3010.45.185.69 – 10.45.185.7010.45.185.71
1910.45.185.72/3010.45.185.73 – 10.45.185.7410.45.185.75
2010.45.185.76/3010.45.185.77 – 10.45.185.7810.45.185.79
2110.45.185.80/3010.45.185.81 – 10.45.185.8210.45.185.83
2210.45.185.84/3010.45.185.85 – 10.45.185.8610.45.185.87
2310.45.185.88/3010.45.185.89 – 10.45.185.9010.45.185.91
2410.45.185.92/3010.45.185.93 – 10.45.185.9410.45.185.95
2510.45.185.96/3010.45.185.97 – 10.45.185.9810.45.185.99
2610.45.185.100/3010.45.185.101 – 10.45.185.10210.45.185.103
2710.45.185.104/3010.45.185.105 – 10.45.185.10610.45.185.107
2810.45.185.108/3010.45.185.109 – 10.45.185.11010.45.185.111
2910.45.185.112/3010.45.185.113 – 10.45.185.11410.45.185.115
3010.45.185.116/3010.45.185.117 – 10.45.185.11810.45.185.119
3110.45.185.120/3010.45.185.121 – 10.45.185.12210.45.185.123
3210.45.185.124/3010.45.185.125 – 10.45.185.12610.45.185.127
3310.45.185.128/3010.45.185.129 – 10.45.185.13010.45.185.131
3410.45.185.132/3010.45.185.133 – 10.45.185.13410.45.185.135
3510.45.185.136/3010.45.185.137 – 10.45.185.13810.45.185.139
3610.45.185.140/3010.45.185.141 – 10.45.185.14210.45.185.143
3710.45.185.144/3010.45.185.145 – 10.45.185.14610.45.185.147
3810.45.185.148/3010.45.185.149 – 10.45.185.15010.45.185.151
3910.45.185.152/3010.45.185.153 – 10.45.185.15410.45.185.155
4010.45.185.156/3010.45.185.157 – 10.45.185.15810.45.185.159
4110.45.185.160/3010.45.185.161 – 10.45.185.16210.45.185.163
4210.45.185.164/3010.45.185.165 – 10.45.185.16610.45.185.167
4310.45.185.168/3010.45.185.169 – 10.45.185.17010.45.185.171
4410.45.185.172/3010.45.185.173 – 10.45.185.17410.45.185.175
4510.45.185.176/3010.45.185.177 – 10.45.185.17810.45.185.179
4610.45.185.180/3010.45.185.181 – 10.45.185.18210.45.185.183
4710.45.185.184/3010.45.185.185 – 10.45.185.18610.45.185.187
4810.45.185.188/3010.45.185.189 – 10.45.185.19010.45.185.191
4910.45.185.192/3010.45.185.193 – 10.45.185.19410.45.185.195
5010.45.185.196/3010.45.185.197 – 10.45.185.19810.45.185.199
5110.45.185.200/3010.45.185.201 – 10.45.185.20210.45.185.203
5210.45.185.204/3010.45.185.205 – 10.45.185.20610.45.185.207
5310.45.185.208/3010.45.185.209 – 10.45.185.21010.45.185.211
5410.45.185.212/3010.45.185.213 – 10.45.185.21410.45.185.215
5510.45.185.216/3010.45.185.217 – 10.45.185.21810.45.185.219
5610.45.185.220/3010.45.185.221 – 10.45.185.22210.45.185.223
5710.45.185.224/3010.45.185.225 – 10.45.185.22610.45.185.227
5810.45.185.228/3010.45.185.229 – 10.45.185.23010.45.185.231
5910.45.185.232/3010.45.185.233 – 10.45.185.23410.45.185.235
6010.45.185.236/3010.45.185.237 – 10.45.185.23810.45.185.239
6110.45.185.240/3010.45.185.241 – 10.45.185.24210.45.185.243
6210.45.185.244/3010.45.185.245 – 10.45.185.24610.45.185.247
6310.45.185.248/3010.45.185.249 – 10.45.185.25010.45.185.251
6410.45.185.252/3010.45.185.253 – 10.45.185.25410.45.185.255
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 →