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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)10.78.32.0/23
network10.78.32.0/23
broadcast10.78.33.255
first host10.78.32.1
last host10.78.33.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.32.0/23
address00001010.01001110.00100000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.00100000.00000000
broadcast00001010.01001110.00100001.11111111
green = network part, grey = host part
hex0x0a4e2000
decimal172892160
reverse dns0.32.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:2000

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.32.0/2910.78.32.1 – 10.78.32.610.78.32.7
210.78.32.8/2910.78.32.9 – 10.78.32.1410.78.32.15
310.78.32.16/2910.78.32.17 – 10.78.32.2210.78.32.23
410.78.32.24/2910.78.32.25 – 10.78.32.3010.78.32.31
510.78.32.32/2910.78.32.33 – 10.78.32.3810.78.32.39
610.78.32.40/2910.78.32.41 – 10.78.32.4610.78.32.47
710.78.32.48/2910.78.32.49 – 10.78.32.5410.78.32.55
810.78.32.56/2910.78.32.57 – 10.78.32.6210.78.32.63
910.78.32.64/2910.78.32.65 – 10.78.32.7010.78.32.71
1010.78.32.72/2910.78.32.73 – 10.78.32.7810.78.32.79
1110.78.32.80/2910.78.32.81 – 10.78.32.8610.78.32.87
1210.78.32.88/2910.78.32.89 – 10.78.32.9410.78.32.95
1310.78.32.96/2910.78.32.97 – 10.78.32.10210.78.32.103
1410.78.32.104/2910.78.32.105 – 10.78.32.11010.78.32.111
1510.78.32.112/2910.78.32.113 – 10.78.32.11810.78.32.119
1610.78.32.120/2910.78.32.121 – 10.78.32.12610.78.32.127
1710.78.32.128/2910.78.32.129 – 10.78.32.13410.78.32.135
1810.78.32.136/2910.78.32.137 – 10.78.32.14210.78.32.143
1910.78.32.144/2910.78.32.145 – 10.78.32.15010.78.32.151
2010.78.32.152/2910.78.32.153 – 10.78.32.15810.78.32.159
2110.78.32.160/2910.78.32.161 – 10.78.32.16610.78.32.167
2210.78.32.168/2910.78.32.169 – 10.78.32.17410.78.32.175
2310.78.32.176/2910.78.32.177 – 10.78.32.18210.78.32.183
2410.78.32.184/2910.78.32.185 – 10.78.32.19010.78.32.191
2510.78.32.192/2910.78.32.193 – 10.78.32.19810.78.32.199
2610.78.32.200/2910.78.32.201 – 10.78.32.20610.78.32.207
2710.78.32.208/2910.78.32.209 – 10.78.32.21410.78.32.215
2810.78.32.216/2910.78.32.217 – 10.78.32.22210.78.32.223
2910.78.32.224/2910.78.32.225 – 10.78.32.23010.78.32.231
3010.78.32.232/2910.78.32.233 – 10.78.32.23810.78.32.239
3110.78.32.240/2910.78.32.241 – 10.78.32.24610.78.32.247
3210.78.32.248/2910.78.32.249 – 10.78.32.25410.78.32.255
3310.78.33.0/2910.78.33.1 – 10.78.33.610.78.33.7
3410.78.33.8/2910.78.33.9 – 10.78.33.1410.78.33.15
3510.78.33.16/2910.78.33.17 – 10.78.33.2210.78.33.23
3610.78.33.24/2910.78.33.25 – 10.78.33.3010.78.33.31
3710.78.33.32/2910.78.33.33 – 10.78.33.3810.78.33.39
3810.78.33.40/2910.78.33.41 – 10.78.33.4610.78.33.47
3910.78.33.48/2910.78.33.49 – 10.78.33.5410.78.33.55
4010.78.33.56/2910.78.33.57 – 10.78.33.6210.78.33.63
4110.78.33.64/2910.78.33.65 – 10.78.33.7010.78.33.71
4210.78.33.72/2910.78.33.73 – 10.78.33.7810.78.33.79
4310.78.33.80/2910.78.33.81 – 10.78.33.8610.78.33.87
4410.78.33.88/2910.78.33.89 – 10.78.33.9410.78.33.95
4510.78.33.96/2910.78.33.97 – 10.78.33.10210.78.33.103
4610.78.33.104/2910.78.33.105 – 10.78.33.11010.78.33.111
4710.78.33.112/2910.78.33.113 – 10.78.33.11810.78.33.119
4810.78.33.120/2910.78.33.121 – 10.78.33.12610.78.33.127
4910.78.33.128/2910.78.33.129 – 10.78.33.13410.78.33.135
5010.78.33.136/2910.78.33.137 – 10.78.33.14210.78.33.143
5110.78.33.144/2910.78.33.145 – 10.78.33.15010.78.33.151
5210.78.33.152/2910.78.33.153 – 10.78.33.15810.78.33.159
5310.78.33.160/2910.78.33.161 – 10.78.33.16610.78.33.167
5410.78.33.168/2910.78.33.169 – 10.78.33.17410.78.33.175
5510.78.33.176/2910.78.33.177 – 10.78.33.18210.78.33.183
5610.78.33.184/2910.78.33.185 – 10.78.33.19010.78.33.191
5710.78.33.192/2910.78.33.193 – 10.78.33.19810.78.33.199
5810.78.33.200/2910.78.33.201 – 10.78.33.20610.78.33.207
5910.78.33.208/2910.78.33.209 – 10.78.33.21410.78.33.215
6010.78.33.216/2910.78.33.217 – 10.78.33.22210.78.33.223
6110.78.33.224/2910.78.33.225 – 10.78.33.23010.78.33.231
6210.78.33.232/2910.78.33.233 – 10.78.33.23810.78.33.239
6310.78.33.240/2910.78.33.241 – 10.78.33.24610.78.33.247
6410.78.33.248/2910.78.33.249 – 10.78.33.25410.78.33.255
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 →