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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)10.78.72.0/23
network10.78.72.0/23
broadcast10.78.73.255
first host10.78.72.1
last host10.78.73.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.72.0/23
address00001010.01001110.01001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.01001000.00000000
broadcast00001010.01001110.01001001.11111111
green = network part, grey = host part
hex0x0a4e4800
decimal172902400
reverse dns0.72.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:4800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.72.0/2910.78.72.1 – 10.78.72.610.78.72.7
210.78.72.8/2910.78.72.9 – 10.78.72.1410.78.72.15
310.78.72.16/2910.78.72.17 – 10.78.72.2210.78.72.23
410.78.72.24/2910.78.72.25 – 10.78.72.3010.78.72.31
510.78.72.32/2910.78.72.33 – 10.78.72.3810.78.72.39
610.78.72.40/2910.78.72.41 – 10.78.72.4610.78.72.47
710.78.72.48/2910.78.72.49 – 10.78.72.5410.78.72.55
810.78.72.56/2910.78.72.57 – 10.78.72.6210.78.72.63
910.78.72.64/2910.78.72.65 – 10.78.72.7010.78.72.71
1010.78.72.72/2910.78.72.73 – 10.78.72.7810.78.72.79
1110.78.72.80/2910.78.72.81 – 10.78.72.8610.78.72.87
1210.78.72.88/2910.78.72.89 – 10.78.72.9410.78.72.95
1310.78.72.96/2910.78.72.97 – 10.78.72.10210.78.72.103
1410.78.72.104/2910.78.72.105 – 10.78.72.11010.78.72.111
1510.78.72.112/2910.78.72.113 – 10.78.72.11810.78.72.119
1610.78.72.120/2910.78.72.121 – 10.78.72.12610.78.72.127
1710.78.72.128/2910.78.72.129 – 10.78.72.13410.78.72.135
1810.78.72.136/2910.78.72.137 – 10.78.72.14210.78.72.143
1910.78.72.144/2910.78.72.145 – 10.78.72.15010.78.72.151
2010.78.72.152/2910.78.72.153 – 10.78.72.15810.78.72.159
2110.78.72.160/2910.78.72.161 – 10.78.72.16610.78.72.167
2210.78.72.168/2910.78.72.169 – 10.78.72.17410.78.72.175
2310.78.72.176/2910.78.72.177 – 10.78.72.18210.78.72.183
2410.78.72.184/2910.78.72.185 – 10.78.72.19010.78.72.191
2510.78.72.192/2910.78.72.193 – 10.78.72.19810.78.72.199
2610.78.72.200/2910.78.72.201 – 10.78.72.20610.78.72.207
2710.78.72.208/2910.78.72.209 – 10.78.72.21410.78.72.215
2810.78.72.216/2910.78.72.217 – 10.78.72.22210.78.72.223
2910.78.72.224/2910.78.72.225 – 10.78.72.23010.78.72.231
3010.78.72.232/2910.78.72.233 – 10.78.72.23810.78.72.239
3110.78.72.240/2910.78.72.241 – 10.78.72.24610.78.72.247
3210.78.72.248/2910.78.72.249 – 10.78.72.25410.78.72.255
3310.78.73.0/2910.78.73.1 – 10.78.73.610.78.73.7
3410.78.73.8/2910.78.73.9 – 10.78.73.1410.78.73.15
3510.78.73.16/2910.78.73.17 – 10.78.73.2210.78.73.23
3610.78.73.24/2910.78.73.25 – 10.78.73.3010.78.73.31
3710.78.73.32/2910.78.73.33 – 10.78.73.3810.78.73.39
3810.78.73.40/2910.78.73.41 – 10.78.73.4610.78.73.47
3910.78.73.48/2910.78.73.49 – 10.78.73.5410.78.73.55
4010.78.73.56/2910.78.73.57 – 10.78.73.6210.78.73.63
4110.78.73.64/2910.78.73.65 – 10.78.73.7010.78.73.71
4210.78.73.72/2910.78.73.73 – 10.78.73.7810.78.73.79
4310.78.73.80/2910.78.73.81 – 10.78.73.8610.78.73.87
4410.78.73.88/2910.78.73.89 – 10.78.73.9410.78.73.95
4510.78.73.96/2910.78.73.97 – 10.78.73.10210.78.73.103
4610.78.73.104/2910.78.73.105 – 10.78.73.11010.78.73.111
4710.78.73.112/2910.78.73.113 – 10.78.73.11810.78.73.119
4810.78.73.120/2910.78.73.121 – 10.78.73.12610.78.73.127
4910.78.73.128/2910.78.73.129 – 10.78.73.13410.78.73.135
5010.78.73.136/2910.78.73.137 – 10.78.73.14210.78.73.143
5110.78.73.144/2910.78.73.145 – 10.78.73.15010.78.73.151
5210.78.73.152/2910.78.73.153 – 10.78.73.15810.78.73.159
5310.78.73.160/2910.78.73.161 – 10.78.73.16610.78.73.167
5410.78.73.168/2910.78.73.169 – 10.78.73.17410.78.73.175
5510.78.73.176/2910.78.73.177 – 10.78.73.18210.78.73.183
5610.78.73.184/2910.78.73.185 – 10.78.73.19010.78.73.191
5710.78.73.192/2910.78.73.193 – 10.78.73.19810.78.73.199
5810.78.73.200/2910.78.73.201 – 10.78.73.20610.78.73.207
5910.78.73.208/2910.78.73.209 – 10.78.73.21410.78.73.215
6010.78.73.216/2910.78.73.217 – 10.78.73.22210.78.73.223
6110.78.73.224/2910.78.73.225 – 10.78.73.23010.78.73.231
6210.78.73.232/2910.78.73.233 – 10.78.73.23810.78.73.239
6310.78.73.240/2910.78.73.241 – 10.78.73.24610.78.73.247
6410.78.73.248/2910.78.73.249 – 10.78.73.25410.78.73.255
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 →