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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)10.0.212.0/23
network10.0.212.0/23
broadcast10.0.213.255
first host10.0.212.1
last host10.0.213.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.212.0/23
address00001010.00000000.11010100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.11010100.00000000
broadcast00001010.00000000.11010101.11111111
green = network part, grey = host part
hex0x0a00d400
decimal167826432
reverse dns0.212.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:d400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.212.0/2910.0.212.1 – 10.0.212.610.0.212.7
210.0.212.8/2910.0.212.9 – 10.0.212.1410.0.212.15
310.0.212.16/2910.0.212.17 – 10.0.212.2210.0.212.23
410.0.212.24/2910.0.212.25 – 10.0.212.3010.0.212.31
510.0.212.32/2910.0.212.33 – 10.0.212.3810.0.212.39
610.0.212.40/2910.0.212.41 – 10.0.212.4610.0.212.47
710.0.212.48/2910.0.212.49 – 10.0.212.5410.0.212.55
810.0.212.56/2910.0.212.57 – 10.0.212.6210.0.212.63
910.0.212.64/2910.0.212.65 – 10.0.212.7010.0.212.71
1010.0.212.72/2910.0.212.73 – 10.0.212.7810.0.212.79
1110.0.212.80/2910.0.212.81 – 10.0.212.8610.0.212.87
1210.0.212.88/2910.0.212.89 – 10.0.212.9410.0.212.95
1310.0.212.96/2910.0.212.97 – 10.0.212.10210.0.212.103
1410.0.212.104/2910.0.212.105 – 10.0.212.11010.0.212.111
1510.0.212.112/2910.0.212.113 – 10.0.212.11810.0.212.119
1610.0.212.120/2910.0.212.121 – 10.0.212.12610.0.212.127
1710.0.212.128/2910.0.212.129 – 10.0.212.13410.0.212.135
1810.0.212.136/2910.0.212.137 – 10.0.212.14210.0.212.143
1910.0.212.144/2910.0.212.145 – 10.0.212.15010.0.212.151
2010.0.212.152/2910.0.212.153 – 10.0.212.15810.0.212.159
2110.0.212.160/2910.0.212.161 – 10.0.212.16610.0.212.167
2210.0.212.168/2910.0.212.169 – 10.0.212.17410.0.212.175
2310.0.212.176/2910.0.212.177 – 10.0.212.18210.0.212.183
2410.0.212.184/2910.0.212.185 – 10.0.212.19010.0.212.191
2510.0.212.192/2910.0.212.193 – 10.0.212.19810.0.212.199
2610.0.212.200/2910.0.212.201 – 10.0.212.20610.0.212.207
2710.0.212.208/2910.0.212.209 – 10.0.212.21410.0.212.215
2810.0.212.216/2910.0.212.217 – 10.0.212.22210.0.212.223
2910.0.212.224/2910.0.212.225 – 10.0.212.23010.0.212.231
3010.0.212.232/2910.0.212.233 – 10.0.212.23810.0.212.239
3110.0.212.240/2910.0.212.241 – 10.0.212.24610.0.212.247
3210.0.212.248/2910.0.212.249 – 10.0.212.25410.0.212.255
3310.0.213.0/2910.0.213.1 – 10.0.213.610.0.213.7
3410.0.213.8/2910.0.213.9 – 10.0.213.1410.0.213.15
3510.0.213.16/2910.0.213.17 – 10.0.213.2210.0.213.23
3610.0.213.24/2910.0.213.25 – 10.0.213.3010.0.213.31
3710.0.213.32/2910.0.213.33 – 10.0.213.3810.0.213.39
3810.0.213.40/2910.0.213.41 – 10.0.213.4610.0.213.47
3910.0.213.48/2910.0.213.49 – 10.0.213.5410.0.213.55
4010.0.213.56/2910.0.213.57 – 10.0.213.6210.0.213.63
4110.0.213.64/2910.0.213.65 – 10.0.213.7010.0.213.71
4210.0.213.72/2910.0.213.73 – 10.0.213.7810.0.213.79
4310.0.213.80/2910.0.213.81 – 10.0.213.8610.0.213.87
4410.0.213.88/2910.0.213.89 – 10.0.213.9410.0.213.95
4510.0.213.96/2910.0.213.97 – 10.0.213.10210.0.213.103
4610.0.213.104/2910.0.213.105 – 10.0.213.11010.0.213.111
4710.0.213.112/2910.0.213.113 – 10.0.213.11810.0.213.119
4810.0.213.120/2910.0.213.121 – 10.0.213.12610.0.213.127
4910.0.213.128/2910.0.213.129 – 10.0.213.13410.0.213.135
5010.0.213.136/2910.0.213.137 – 10.0.213.14210.0.213.143
5110.0.213.144/2910.0.213.145 – 10.0.213.15010.0.213.151
5210.0.213.152/2910.0.213.153 – 10.0.213.15810.0.213.159
5310.0.213.160/2910.0.213.161 – 10.0.213.16610.0.213.167
5410.0.213.168/2910.0.213.169 – 10.0.213.17410.0.213.175
5510.0.213.176/2910.0.213.177 – 10.0.213.18210.0.213.183
5610.0.213.184/2910.0.213.185 – 10.0.213.19010.0.213.191
5710.0.213.192/2910.0.213.193 – 10.0.213.19810.0.213.199
5810.0.213.200/2910.0.213.201 – 10.0.213.20610.0.213.207
5910.0.213.208/2910.0.213.209 – 10.0.213.21410.0.213.215
6010.0.213.216/2910.0.213.217 – 10.0.213.22210.0.213.223
6110.0.213.224/2910.0.213.225 – 10.0.213.23010.0.213.231
6210.0.213.232/2910.0.213.233 – 10.0.213.23810.0.213.239
6310.0.213.240/2910.0.213.241 – 10.0.213.24610.0.213.247
6410.0.213.248/2910.0.213.249 – 10.0.213.25410.0.213.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →