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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)10.72.232.0/23
network10.72.232.0/23
broadcast10.72.233.255
first host10.72.232.1
last host10.72.233.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.72.232.0/23
address00001010.01001000.11101000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001000.11101000.00000000
broadcast00001010.01001000.11101001.11111111
green = network part, grey = host part
hex0x0a48e800
decimal172550144
reverse dns0.232.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:e800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.232.0/2910.72.232.1 – 10.72.232.610.72.232.7
210.72.232.8/2910.72.232.9 – 10.72.232.1410.72.232.15
310.72.232.16/2910.72.232.17 – 10.72.232.2210.72.232.23
410.72.232.24/2910.72.232.25 – 10.72.232.3010.72.232.31
510.72.232.32/2910.72.232.33 – 10.72.232.3810.72.232.39
610.72.232.40/2910.72.232.41 – 10.72.232.4610.72.232.47
710.72.232.48/2910.72.232.49 – 10.72.232.5410.72.232.55
810.72.232.56/2910.72.232.57 – 10.72.232.6210.72.232.63
910.72.232.64/2910.72.232.65 – 10.72.232.7010.72.232.71
1010.72.232.72/2910.72.232.73 – 10.72.232.7810.72.232.79
1110.72.232.80/2910.72.232.81 – 10.72.232.8610.72.232.87
1210.72.232.88/2910.72.232.89 – 10.72.232.9410.72.232.95
1310.72.232.96/2910.72.232.97 – 10.72.232.10210.72.232.103
1410.72.232.104/2910.72.232.105 – 10.72.232.11010.72.232.111
1510.72.232.112/2910.72.232.113 – 10.72.232.11810.72.232.119
1610.72.232.120/2910.72.232.121 – 10.72.232.12610.72.232.127
1710.72.232.128/2910.72.232.129 – 10.72.232.13410.72.232.135
1810.72.232.136/2910.72.232.137 – 10.72.232.14210.72.232.143
1910.72.232.144/2910.72.232.145 – 10.72.232.15010.72.232.151
2010.72.232.152/2910.72.232.153 – 10.72.232.15810.72.232.159
2110.72.232.160/2910.72.232.161 – 10.72.232.16610.72.232.167
2210.72.232.168/2910.72.232.169 – 10.72.232.17410.72.232.175
2310.72.232.176/2910.72.232.177 – 10.72.232.18210.72.232.183
2410.72.232.184/2910.72.232.185 – 10.72.232.19010.72.232.191
2510.72.232.192/2910.72.232.193 – 10.72.232.19810.72.232.199
2610.72.232.200/2910.72.232.201 – 10.72.232.20610.72.232.207
2710.72.232.208/2910.72.232.209 – 10.72.232.21410.72.232.215
2810.72.232.216/2910.72.232.217 – 10.72.232.22210.72.232.223
2910.72.232.224/2910.72.232.225 – 10.72.232.23010.72.232.231
3010.72.232.232/2910.72.232.233 – 10.72.232.23810.72.232.239
3110.72.232.240/2910.72.232.241 – 10.72.232.24610.72.232.247
3210.72.232.248/2910.72.232.249 – 10.72.232.25410.72.232.255
3310.72.233.0/2910.72.233.1 – 10.72.233.610.72.233.7
3410.72.233.8/2910.72.233.9 – 10.72.233.1410.72.233.15
3510.72.233.16/2910.72.233.17 – 10.72.233.2210.72.233.23
3610.72.233.24/2910.72.233.25 – 10.72.233.3010.72.233.31
3710.72.233.32/2910.72.233.33 – 10.72.233.3810.72.233.39
3810.72.233.40/2910.72.233.41 – 10.72.233.4610.72.233.47
3910.72.233.48/2910.72.233.49 – 10.72.233.5410.72.233.55
4010.72.233.56/2910.72.233.57 – 10.72.233.6210.72.233.63
4110.72.233.64/2910.72.233.65 – 10.72.233.7010.72.233.71
4210.72.233.72/2910.72.233.73 – 10.72.233.7810.72.233.79
4310.72.233.80/2910.72.233.81 – 10.72.233.8610.72.233.87
4410.72.233.88/2910.72.233.89 – 10.72.233.9410.72.233.95
4510.72.233.96/2910.72.233.97 – 10.72.233.10210.72.233.103
4610.72.233.104/2910.72.233.105 – 10.72.233.11010.72.233.111
4710.72.233.112/2910.72.233.113 – 10.72.233.11810.72.233.119
4810.72.233.120/2910.72.233.121 – 10.72.233.12610.72.233.127
4910.72.233.128/2910.72.233.129 – 10.72.233.13410.72.233.135
5010.72.233.136/2910.72.233.137 – 10.72.233.14210.72.233.143
5110.72.233.144/2910.72.233.145 – 10.72.233.15010.72.233.151
5210.72.233.152/2910.72.233.153 – 10.72.233.15810.72.233.159
5310.72.233.160/2910.72.233.161 – 10.72.233.16610.72.233.167
5410.72.233.168/2910.72.233.169 – 10.72.233.17410.72.233.175
5510.72.233.176/2910.72.233.177 – 10.72.233.18210.72.233.183
5610.72.233.184/2910.72.233.185 – 10.72.233.19010.72.233.191
5710.72.233.192/2910.72.233.193 – 10.72.233.19810.72.233.199
5810.72.233.200/2910.72.233.201 – 10.72.233.20610.72.233.207
5910.72.233.208/2910.72.233.209 – 10.72.233.21410.72.233.215
6010.72.233.216/2910.72.233.217 – 10.72.233.22210.72.233.223
6110.72.233.224/2910.72.233.225 – 10.72.233.23010.72.233.231
6210.72.233.232/2910.72.233.233 – 10.72.233.23810.72.233.239
6310.72.233.240/2910.72.233.241 – 10.72.233.24610.72.233.247
6410.72.233.248/2910.72.233.249 – 10.72.233.25410.72.233.255
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 →