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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)10.45.16.0/24
network10.45.16.0/24
broadcast10.45.16.255
first host10.45.16.1
last host10.45.16.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.16.0/24
address00001010.00101101.00010000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.00010000.00000000
broadcast00001010.00101101.00010000.11111111
green = network part, grey = host part
hex0x0a2d1000
decimal170725376
reverse dns0.16.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:1000

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.16.0/3010.45.16.1 – 10.45.16.210.45.16.3
210.45.16.4/3010.45.16.5 – 10.45.16.610.45.16.7
310.45.16.8/3010.45.16.9 – 10.45.16.1010.45.16.11
410.45.16.12/3010.45.16.13 – 10.45.16.1410.45.16.15
510.45.16.16/3010.45.16.17 – 10.45.16.1810.45.16.19
610.45.16.20/3010.45.16.21 – 10.45.16.2210.45.16.23
710.45.16.24/3010.45.16.25 – 10.45.16.2610.45.16.27
810.45.16.28/3010.45.16.29 – 10.45.16.3010.45.16.31
910.45.16.32/3010.45.16.33 – 10.45.16.3410.45.16.35
1010.45.16.36/3010.45.16.37 – 10.45.16.3810.45.16.39
1110.45.16.40/3010.45.16.41 – 10.45.16.4210.45.16.43
1210.45.16.44/3010.45.16.45 – 10.45.16.4610.45.16.47
1310.45.16.48/3010.45.16.49 – 10.45.16.5010.45.16.51
1410.45.16.52/3010.45.16.53 – 10.45.16.5410.45.16.55
1510.45.16.56/3010.45.16.57 – 10.45.16.5810.45.16.59
1610.45.16.60/3010.45.16.61 – 10.45.16.6210.45.16.63
1710.45.16.64/3010.45.16.65 – 10.45.16.6610.45.16.67
1810.45.16.68/3010.45.16.69 – 10.45.16.7010.45.16.71
1910.45.16.72/3010.45.16.73 – 10.45.16.7410.45.16.75
2010.45.16.76/3010.45.16.77 – 10.45.16.7810.45.16.79
2110.45.16.80/3010.45.16.81 – 10.45.16.8210.45.16.83
2210.45.16.84/3010.45.16.85 – 10.45.16.8610.45.16.87
2310.45.16.88/3010.45.16.89 – 10.45.16.9010.45.16.91
2410.45.16.92/3010.45.16.93 – 10.45.16.9410.45.16.95
2510.45.16.96/3010.45.16.97 – 10.45.16.9810.45.16.99
2610.45.16.100/3010.45.16.101 – 10.45.16.10210.45.16.103
2710.45.16.104/3010.45.16.105 – 10.45.16.10610.45.16.107
2810.45.16.108/3010.45.16.109 – 10.45.16.11010.45.16.111
2910.45.16.112/3010.45.16.113 – 10.45.16.11410.45.16.115
3010.45.16.116/3010.45.16.117 – 10.45.16.11810.45.16.119
3110.45.16.120/3010.45.16.121 – 10.45.16.12210.45.16.123
3210.45.16.124/3010.45.16.125 – 10.45.16.12610.45.16.127
3310.45.16.128/3010.45.16.129 – 10.45.16.13010.45.16.131
3410.45.16.132/3010.45.16.133 – 10.45.16.13410.45.16.135
3510.45.16.136/3010.45.16.137 – 10.45.16.13810.45.16.139
3610.45.16.140/3010.45.16.141 – 10.45.16.14210.45.16.143
3710.45.16.144/3010.45.16.145 – 10.45.16.14610.45.16.147
3810.45.16.148/3010.45.16.149 – 10.45.16.15010.45.16.151
3910.45.16.152/3010.45.16.153 – 10.45.16.15410.45.16.155
4010.45.16.156/3010.45.16.157 – 10.45.16.15810.45.16.159
4110.45.16.160/3010.45.16.161 – 10.45.16.16210.45.16.163
4210.45.16.164/3010.45.16.165 – 10.45.16.16610.45.16.167
4310.45.16.168/3010.45.16.169 – 10.45.16.17010.45.16.171
4410.45.16.172/3010.45.16.173 – 10.45.16.17410.45.16.175
4510.45.16.176/3010.45.16.177 – 10.45.16.17810.45.16.179
4610.45.16.180/3010.45.16.181 – 10.45.16.18210.45.16.183
4710.45.16.184/3010.45.16.185 – 10.45.16.18610.45.16.187
4810.45.16.188/3010.45.16.189 – 10.45.16.19010.45.16.191
4910.45.16.192/3010.45.16.193 – 10.45.16.19410.45.16.195
5010.45.16.196/3010.45.16.197 – 10.45.16.19810.45.16.199
5110.45.16.200/3010.45.16.201 – 10.45.16.20210.45.16.203
5210.45.16.204/3010.45.16.205 – 10.45.16.20610.45.16.207
5310.45.16.208/3010.45.16.209 – 10.45.16.21010.45.16.211
5410.45.16.212/3010.45.16.213 – 10.45.16.21410.45.16.215
5510.45.16.216/3010.45.16.217 – 10.45.16.21810.45.16.219
5610.45.16.220/3010.45.16.221 – 10.45.16.22210.45.16.223
5710.45.16.224/3010.45.16.225 – 10.45.16.22610.45.16.227
5810.45.16.228/3010.45.16.229 – 10.45.16.23010.45.16.231
5910.45.16.232/3010.45.16.233 – 10.45.16.23410.45.16.235
6010.45.16.236/3010.45.16.237 – 10.45.16.23810.45.16.239
6110.45.16.240/3010.45.16.241 – 10.45.16.24210.45.16.243
6210.45.16.244/3010.45.16.245 – 10.45.16.24610.45.16.247
6310.45.16.248/3010.45.16.249 – 10.45.16.25010.45.16.251
6410.45.16.252/3010.45.16.253 – 10.45.16.25410.45.16.255
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 →