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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)10.232.4.0/23
network10.232.4.0/23
broadcast10.232.5.255
first host10.232.4.1
last host10.232.5.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.232.4.0/23
address00001010.11101000.00000100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11101000.00000100.00000000
broadcast00001010.11101000.00000101.11111111
green = network part, grey = host part
hex0x0ae80400
decimal182977536
reverse dns0.4.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.4.0/2910.232.4.1 – 10.232.4.610.232.4.7
210.232.4.8/2910.232.4.9 – 10.232.4.1410.232.4.15
310.232.4.16/2910.232.4.17 – 10.232.4.2210.232.4.23
410.232.4.24/2910.232.4.25 – 10.232.4.3010.232.4.31
510.232.4.32/2910.232.4.33 – 10.232.4.3810.232.4.39
610.232.4.40/2910.232.4.41 – 10.232.4.4610.232.4.47
710.232.4.48/2910.232.4.49 – 10.232.4.5410.232.4.55
810.232.4.56/2910.232.4.57 – 10.232.4.6210.232.4.63
910.232.4.64/2910.232.4.65 – 10.232.4.7010.232.4.71
1010.232.4.72/2910.232.4.73 – 10.232.4.7810.232.4.79
1110.232.4.80/2910.232.4.81 – 10.232.4.8610.232.4.87
1210.232.4.88/2910.232.4.89 – 10.232.4.9410.232.4.95
1310.232.4.96/2910.232.4.97 – 10.232.4.10210.232.4.103
1410.232.4.104/2910.232.4.105 – 10.232.4.11010.232.4.111
1510.232.4.112/2910.232.4.113 – 10.232.4.11810.232.4.119
1610.232.4.120/2910.232.4.121 – 10.232.4.12610.232.4.127
1710.232.4.128/2910.232.4.129 – 10.232.4.13410.232.4.135
1810.232.4.136/2910.232.4.137 – 10.232.4.14210.232.4.143
1910.232.4.144/2910.232.4.145 – 10.232.4.15010.232.4.151
2010.232.4.152/2910.232.4.153 – 10.232.4.15810.232.4.159
2110.232.4.160/2910.232.4.161 – 10.232.4.16610.232.4.167
2210.232.4.168/2910.232.4.169 – 10.232.4.17410.232.4.175
2310.232.4.176/2910.232.4.177 – 10.232.4.18210.232.4.183
2410.232.4.184/2910.232.4.185 – 10.232.4.19010.232.4.191
2510.232.4.192/2910.232.4.193 – 10.232.4.19810.232.4.199
2610.232.4.200/2910.232.4.201 – 10.232.4.20610.232.4.207
2710.232.4.208/2910.232.4.209 – 10.232.4.21410.232.4.215
2810.232.4.216/2910.232.4.217 – 10.232.4.22210.232.4.223
2910.232.4.224/2910.232.4.225 – 10.232.4.23010.232.4.231
3010.232.4.232/2910.232.4.233 – 10.232.4.23810.232.4.239
3110.232.4.240/2910.232.4.241 – 10.232.4.24610.232.4.247
3210.232.4.248/2910.232.4.249 – 10.232.4.25410.232.4.255
3310.232.5.0/2910.232.5.1 – 10.232.5.610.232.5.7
3410.232.5.8/2910.232.5.9 – 10.232.5.1410.232.5.15
3510.232.5.16/2910.232.5.17 – 10.232.5.2210.232.5.23
3610.232.5.24/2910.232.5.25 – 10.232.5.3010.232.5.31
3710.232.5.32/2910.232.5.33 – 10.232.5.3810.232.5.39
3810.232.5.40/2910.232.5.41 – 10.232.5.4610.232.5.47
3910.232.5.48/2910.232.5.49 – 10.232.5.5410.232.5.55
4010.232.5.56/2910.232.5.57 – 10.232.5.6210.232.5.63
4110.232.5.64/2910.232.5.65 – 10.232.5.7010.232.5.71
4210.232.5.72/2910.232.5.73 – 10.232.5.7810.232.5.79
4310.232.5.80/2910.232.5.81 – 10.232.5.8610.232.5.87
4410.232.5.88/2910.232.5.89 – 10.232.5.9410.232.5.95
4510.232.5.96/2910.232.5.97 – 10.232.5.10210.232.5.103
4610.232.5.104/2910.232.5.105 – 10.232.5.11010.232.5.111
4710.232.5.112/2910.232.5.113 – 10.232.5.11810.232.5.119
4810.232.5.120/2910.232.5.121 – 10.232.5.12610.232.5.127
4910.232.5.128/2910.232.5.129 – 10.232.5.13410.232.5.135
5010.232.5.136/2910.232.5.137 – 10.232.5.14210.232.5.143
5110.232.5.144/2910.232.5.145 – 10.232.5.15010.232.5.151
5210.232.5.152/2910.232.5.153 – 10.232.5.15810.232.5.159
5310.232.5.160/2910.232.5.161 – 10.232.5.16610.232.5.167
5410.232.5.168/2910.232.5.169 – 10.232.5.17410.232.5.175
5510.232.5.176/2910.232.5.177 – 10.232.5.18210.232.5.183
5610.232.5.184/2910.232.5.185 – 10.232.5.19010.232.5.191
5710.232.5.192/2910.232.5.193 – 10.232.5.19810.232.5.199
5810.232.5.200/2910.232.5.201 – 10.232.5.20610.232.5.207
5910.232.5.208/2910.232.5.209 – 10.232.5.21410.232.5.215
6010.232.5.216/2910.232.5.217 – 10.232.5.22210.232.5.223
6110.232.5.224/2910.232.5.225 – 10.232.5.23010.232.5.231
6210.232.5.232/2910.232.5.233 – 10.232.5.23810.232.5.239
6310.232.5.240/2910.232.5.241 – 10.232.5.24610.232.5.247
6410.232.5.248/2910.232.5.249 – 10.232.5.25410.232.5.255
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 →