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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)10.78.24.0/23
network10.78.24.0/23
broadcast10.78.25.255
first host10.78.24.1
last host10.78.25.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.24.0/23
address00001010.01001110.00011000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.00011000.00000000
broadcast00001010.01001110.00011001.11111111
green = network part, grey = host part
hex0x0a4e1800
decimal172890112
reverse dns0.24.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:1800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.24.0/2910.78.24.1 – 10.78.24.610.78.24.7
210.78.24.8/2910.78.24.9 – 10.78.24.1410.78.24.15
310.78.24.16/2910.78.24.17 – 10.78.24.2210.78.24.23
410.78.24.24/2910.78.24.25 – 10.78.24.3010.78.24.31
510.78.24.32/2910.78.24.33 – 10.78.24.3810.78.24.39
610.78.24.40/2910.78.24.41 – 10.78.24.4610.78.24.47
710.78.24.48/2910.78.24.49 – 10.78.24.5410.78.24.55
810.78.24.56/2910.78.24.57 – 10.78.24.6210.78.24.63
910.78.24.64/2910.78.24.65 – 10.78.24.7010.78.24.71
1010.78.24.72/2910.78.24.73 – 10.78.24.7810.78.24.79
1110.78.24.80/2910.78.24.81 – 10.78.24.8610.78.24.87
1210.78.24.88/2910.78.24.89 – 10.78.24.9410.78.24.95
1310.78.24.96/2910.78.24.97 – 10.78.24.10210.78.24.103
1410.78.24.104/2910.78.24.105 – 10.78.24.11010.78.24.111
1510.78.24.112/2910.78.24.113 – 10.78.24.11810.78.24.119
1610.78.24.120/2910.78.24.121 – 10.78.24.12610.78.24.127
1710.78.24.128/2910.78.24.129 – 10.78.24.13410.78.24.135
1810.78.24.136/2910.78.24.137 – 10.78.24.14210.78.24.143
1910.78.24.144/2910.78.24.145 – 10.78.24.15010.78.24.151
2010.78.24.152/2910.78.24.153 – 10.78.24.15810.78.24.159
2110.78.24.160/2910.78.24.161 – 10.78.24.16610.78.24.167
2210.78.24.168/2910.78.24.169 – 10.78.24.17410.78.24.175
2310.78.24.176/2910.78.24.177 – 10.78.24.18210.78.24.183
2410.78.24.184/2910.78.24.185 – 10.78.24.19010.78.24.191
2510.78.24.192/2910.78.24.193 – 10.78.24.19810.78.24.199
2610.78.24.200/2910.78.24.201 – 10.78.24.20610.78.24.207
2710.78.24.208/2910.78.24.209 – 10.78.24.21410.78.24.215
2810.78.24.216/2910.78.24.217 – 10.78.24.22210.78.24.223
2910.78.24.224/2910.78.24.225 – 10.78.24.23010.78.24.231
3010.78.24.232/2910.78.24.233 – 10.78.24.23810.78.24.239
3110.78.24.240/2910.78.24.241 – 10.78.24.24610.78.24.247
3210.78.24.248/2910.78.24.249 – 10.78.24.25410.78.24.255
3310.78.25.0/2910.78.25.1 – 10.78.25.610.78.25.7
3410.78.25.8/2910.78.25.9 – 10.78.25.1410.78.25.15
3510.78.25.16/2910.78.25.17 – 10.78.25.2210.78.25.23
3610.78.25.24/2910.78.25.25 – 10.78.25.3010.78.25.31
3710.78.25.32/2910.78.25.33 – 10.78.25.3810.78.25.39
3810.78.25.40/2910.78.25.41 – 10.78.25.4610.78.25.47
3910.78.25.48/2910.78.25.49 – 10.78.25.5410.78.25.55
4010.78.25.56/2910.78.25.57 – 10.78.25.6210.78.25.63
4110.78.25.64/2910.78.25.65 – 10.78.25.7010.78.25.71
4210.78.25.72/2910.78.25.73 – 10.78.25.7810.78.25.79
4310.78.25.80/2910.78.25.81 – 10.78.25.8610.78.25.87
4410.78.25.88/2910.78.25.89 – 10.78.25.9410.78.25.95
4510.78.25.96/2910.78.25.97 – 10.78.25.10210.78.25.103
4610.78.25.104/2910.78.25.105 – 10.78.25.11010.78.25.111
4710.78.25.112/2910.78.25.113 – 10.78.25.11810.78.25.119
4810.78.25.120/2910.78.25.121 – 10.78.25.12610.78.25.127
4910.78.25.128/2910.78.25.129 – 10.78.25.13410.78.25.135
5010.78.25.136/2910.78.25.137 – 10.78.25.14210.78.25.143
5110.78.25.144/2910.78.25.145 – 10.78.25.15010.78.25.151
5210.78.25.152/2910.78.25.153 – 10.78.25.15810.78.25.159
5310.78.25.160/2910.78.25.161 – 10.78.25.16610.78.25.167
5410.78.25.168/2910.78.25.169 – 10.78.25.17410.78.25.175
5510.78.25.176/2910.78.25.177 – 10.78.25.18210.78.25.183
5610.78.25.184/2910.78.25.185 – 10.78.25.19010.78.25.191
5710.78.25.192/2910.78.25.193 – 10.78.25.19810.78.25.199
5810.78.25.200/2910.78.25.201 – 10.78.25.20610.78.25.207
5910.78.25.208/2910.78.25.209 – 10.78.25.21410.78.25.215
6010.78.25.216/2910.78.25.217 – 10.78.25.22210.78.25.223
6110.78.25.224/2910.78.25.225 – 10.78.25.23010.78.25.231
6210.78.25.232/2910.78.25.233 – 10.78.25.23810.78.25.239
6310.78.25.240/2910.78.25.241 – 10.78.25.24610.78.25.247
6410.78.25.248/2910.78.25.249 – 10.78.25.25410.78.25.255
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 →