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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)10.45.45.0/24
network10.45.45.0/24
broadcast10.45.45.255
first host10.45.45.1
last host10.45.45.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.45.0/24
address00001010.00101101.00101101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.00101101.00000000
broadcast00001010.00101101.00101101.11111111
green = network part, grey = host part
hex0x0a2d2d00
decimal170732800
reverse dns0.45.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:2d00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.45.0/3010.45.45.1 – 10.45.45.210.45.45.3
210.45.45.4/3010.45.45.5 – 10.45.45.610.45.45.7
310.45.45.8/3010.45.45.9 – 10.45.45.1010.45.45.11
410.45.45.12/3010.45.45.13 – 10.45.45.1410.45.45.15
510.45.45.16/3010.45.45.17 – 10.45.45.1810.45.45.19
610.45.45.20/3010.45.45.21 – 10.45.45.2210.45.45.23
710.45.45.24/3010.45.45.25 – 10.45.45.2610.45.45.27
810.45.45.28/3010.45.45.29 – 10.45.45.3010.45.45.31
910.45.45.32/3010.45.45.33 – 10.45.45.3410.45.45.35
1010.45.45.36/3010.45.45.37 – 10.45.45.3810.45.45.39
1110.45.45.40/3010.45.45.41 – 10.45.45.4210.45.45.43
1210.45.45.44/3010.45.45.45 – 10.45.45.4610.45.45.47
1310.45.45.48/3010.45.45.49 – 10.45.45.5010.45.45.51
1410.45.45.52/3010.45.45.53 – 10.45.45.5410.45.45.55
1510.45.45.56/3010.45.45.57 – 10.45.45.5810.45.45.59
1610.45.45.60/3010.45.45.61 – 10.45.45.6210.45.45.63
1710.45.45.64/3010.45.45.65 – 10.45.45.6610.45.45.67
1810.45.45.68/3010.45.45.69 – 10.45.45.7010.45.45.71
1910.45.45.72/3010.45.45.73 – 10.45.45.7410.45.45.75
2010.45.45.76/3010.45.45.77 – 10.45.45.7810.45.45.79
2110.45.45.80/3010.45.45.81 – 10.45.45.8210.45.45.83
2210.45.45.84/3010.45.45.85 – 10.45.45.8610.45.45.87
2310.45.45.88/3010.45.45.89 – 10.45.45.9010.45.45.91
2410.45.45.92/3010.45.45.93 – 10.45.45.9410.45.45.95
2510.45.45.96/3010.45.45.97 – 10.45.45.9810.45.45.99
2610.45.45.100/3010.45.45.101 – 10.45.45.10210.45.45.103
2710.45.45.104/3010.45.45.105 – 10.45.45.10610.45.45.107
2810.45.45.108/3010.45.45.109 – 10.45.45.11010.45.45.111
2910.45.45.112/3010.45.45.113 – 10.45.45.11410.45.45.115
3010.45.45.116/3010.45.45.117 – 10.45.45.11810.45.45.119
3110.45.45.120/3010.45.45.121 – 10.45.45.12210.45.45.123
3210.45.45.124/3010.45.45.125 – 10.45.45.12610.45.45.127
3310.45.45.128/3010.45.45.129 – 10.45.45.13010.45.45.131
3410.45.45.132/3010.45.45.133 – 10.45.45.13410.45.45.135
3510.45.45.136/3010.45.45.137 – 10.45.45.13810.45.45.139
3610.45.45.140/3010.45.45.141 – 10.45.45.14210.45.45.143
3710.45.45.144/3010.45.45.145 – 10.45.45.14610.45.45.147
3810.45.45.148/3010.45.45.149 – 10.45.45.15010.45.45.151
3910.45.45.152/3010.45.45.153 – 10.45.45.15410.45.45.155
4010.45.45.156/3010.45.45.157 – 10.45.45.15810.45.45.159
4110.45.45.160/3010.45.45.161 – 10.45.45.16210.45.45.163
4210.45.45.164/3010.45.45.165 – 10.45.45.16610.45.45.167
4310.45.45.168/3010.45.45.169 – 10.45.45.17010.45.45.171
4410.45.45.172/3010.45.45.173 – 10.45.45.17410.45.45.175
4510.45.45.176/3010.45.45.177 – 10.45.45.17810.45.45.179
4610.45.45.180/3010.45.45.181 – 10.45.45.18210.45.45.183
4710.45.45.184/3010.45.45.185 – 10.45.45.18610.45.45.187
4810.45.45.188/3010.45.45.189 – 10.45.45.19010.45.45.191
4910.45.45.192/3010.45.45.193 – 10.45.45.19410.45.45.195
5010.45.45.196/3010.45.45.197 – 10.45.45.19810.45.45.199
5110.45.45.200/3010.45.45.201 – 10.45.45.20210.45.45.203
5210.45.45.204/3010.45.45.205 – 10.45.45.20610.45.45.207
5310.45.45.208/3010.45.45.209 – 10.45.45.21010.45.45.211
5410.45.45.212/3010.45.45.213 – 10.45.45.21410.45.45.215
5510.45.45.216/3010.45.45.217 – 10.45.45.21810.45.45.219
5610.45.45.220/3010.45.45.221 – 10.45.45.22210.45.45.223
5710.45.45.224/3010.45.45.225 – 10.45.45.22610.45.45.227
5810.45.45.228/3010.45.45.229 – 10.45.45.23010.45.45.231
5910.45.45.232/3010.45.45.233 – 10.45.45.23410.45.45.235
6010.45.45.236/3010.45.45.237 – 10.45.45.23810.45.45.239
6110.45.45.240/3010.45.45.241 – 10.45.45.24210.45.45.243
6210.45.45.244/3010.45.45.245 – 10.45.45.24610.45.45.247
6310.45.45.248/3010.45.45.249 – 10.45.45.25010.45.45.251
6410.45.45.252/3010.45.45.253 – 10.45.45.25410.45.45.255
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 →