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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)10.232.68.0/23
network10.232.68.0/23
broadcast10.232.69.255
first host10.232.68.1
last host10.232.69.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.232.68.0/23
address00001010.11101000.01000100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11101000.01000100.00000000
broadcast00001010.11101000.01000101.11111111
green = network part, grey = host part
hex0x0ae84400
decimal182993920
reverse dns0.68.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:4400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.68.0/2910.232.68.1 – 10.232.68.610.232.68.7
210.232.68.8/2910.232.68.9 – 10.232.68.1410.232.68.15
310.232.68.16/2910.232.68.17 – 10.232.68.2210.232.68.23
410.232.68.24/2910.232.68.25 – 10.232.68.3010.232.68.31
510.232.68.32/2910.232.68.33 – 10.232.68.3810.232.68.39
610.232.68.40/2910.232.68.41 – 10.232.68.4610.232.68.47
710.232.68.48/2910.232.68.49 – 10.232.68.5410.232.68.55
810.232.68.56/2910.232.68.57 – 10.232.68.6210.232.68.63
910.232.68.64/2910.232.68.65 – 10.232.68.7010.232.68.71
1010.232.68.72/2910.232.68.73 – 10.232.68.7810.232.68.79
1110.232.68.80/2910.232.68.81 – 10.232.68.8610.232.68.87
1210.232.68.88/2910.232.68.89 – 10.232.68.9410.232.68.95
1310.232.68.96/2910.232.68.97 – 10.232.68.10210.232.68.103
1410.232.68.104/2910.232.68.105 – 10.232.68.11010.232.68.111
1510.232.68.112/2910.232.68.113 – 10.232.68.11810.232.68.119
1610.232.68.120/2910.232.68.121 – 10.232.68.12610.232.68.127
1710.232.68.128/2910.232.68.129 – 10.232.68.13410.232.68.135
1810.232.68.136/2910.232.68.137 – 10.232.68.14210.232.68.143
1910.232.68.144/2910.232.68.145 – 10.232.68.15010.232.68.151
2010.232.68.152/2910.232.68.153 – 10.232.68.15810.232.68.159
2110.232.68.160/2910.232.68.161 – 10.232.68.16610.232.68.167
2210.232.68.168/2910.232.68.169 – 10.232.68.17410.232.68.175
2310.232.68.176/2910.232.68.177 – 10.232.68.18210.232.68.183
2410.232.68.184/2910.232.68.185 – 10.232.68.19010.232.68.191
2510.232.68.192/2910.232.68.193 – 10.232.68.19810.232.68.199
2610.232.68.200/2910.232.68.201 – 10.232.68.20610.232.68.207
2710.232.68.208/2910.232.68.209 – 10.232.68.21410.232.68.215
2810.232.68.216/2910.232.68.217 – 10.232.68.22210.232.68.223
2910.232.68.224/2910.232.68.225 – 10.232.68.23010.232.68.231
3010.232.68.232/2910.232.68.233 – 10.232.68.23810.232.68.239
3110.232.68.240/2910.232.68.241 – 10.232.68.24610.232.68.247
3210.232.68.248/2910.232.68.249 – 10.232.68.25410.232.68.255
3310.232.69.0/2910.232.69.1 – 10.232.69.610.232.69.7
3410.232.69.8/2910.232.69.9 – 10.232.69.1410.232.69.15
3510.232.69.16/2910.232.69.17 – 10.232.69.2210.232.69.23
3610.232.69.24/2910.232.69.25 – 10.232.69.3010.232.69.31
3710.232.69.32/2910.232.69.33 – 10.232.69.3810.232.69.39
3810.232.69.40/2910.232.69.41 – 10.232.69.4610.232.69.47
3910.232.69.48/2910.232.69.49 – 10.232.69.5410.232.69.55
4010.232.69.56/2910.232.69.57 – 10.232.69.6210.232.69.63
4110.232.69.64/2910.232.69.65 – 10.232.69.7010.232.69.71
4210.232.69.72/2910.232.69.73 – 10.232.69.7810.232.69.79
4310.232.69.80/2910.232.69.81 – 10.232.69.8610.232.69.87
4410.232.69.88/2910.232.69.89 – 10.232.69.9410.232.69.95
4510.232.69.96/2910.232.69.97 – 10.232.69.10210.232.69.103
4610.232.69.104/2910.232.69.105 – 10.232.69.11010.232.69.111
4710.232.69.112/2910.232.69.113 – 10.232.69.11810.232.69.119
4810.232.69.120/2910.232.69.121 – 10.232.69.12610.232.69.127
4910.232.69.128/2910.232.69.129 – 10.232.69.13410.232.69.135
5010.232.69.136/2910.232.69.137 – 10.232.69.14210.232.69.143
5110.232.69.144/2910.232.69.145 – 10.232.69.15010.232.69.151
5210.232.69.152/2910.232.69.153 – 10.232.69.15810.232.69.159
5310.232.69.160/2910.232.69.161 – 10.232.69.16610.232.69.167
5410.232.69.168/2910.232.69.169 – 10.232.69.17410.232.69.175
5510.232.69.176/2910.232.69.177 – 10.232.69.18210.232.69.183
5610.232.69.184/2910.232.69.185 – 10.232.69.19010.232.69.191
5710.232.69.192/2910.232.69.193 – 10.232.69.19810.232.69.199
5810.232.69.200/2910.232.69.201 – 10.232.69.20610.232.69.207
5910.232.69.208/2910.232.69.209 – 10.232.69.21410.232.69.215
6010.232.69.216/2910.232.69.217 – 10.232.69.22210.232.69.223
6110.232.69.224/2910.232.69.225 – 10.232.69.23010.232.69.231
6210.232.69.232/2910.232.69.233 – 10.232.69.23810.232.69.239
6310.232.69.240/2910.232.69.241 – 10.232.69.24610.232.69.247
6410.232.69.248/2910.232.69.249 – 10.232.69.25410.232.69.255
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 →