ip
ipku.in

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)10.78.90.0/23
network10.78.90.0/23
broadcast10.78.91.255
first host10.78.90.1
last host10.78.91.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.90.0/23
address00001010.01001110.01011010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.01011010.00000000
broadcast00001010.01001110.01011011.11111111
green = network part, grey = host part
hex0x0a4e5a00
decimal172907008
reverse dns0.90.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:5a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.90.0/2910.78.90.1 – 10.78.90.610.78.90.7
210.78.90.8/2910.78.90.9 – 10.78.90.1410.78.90.15
310.78.90.16/2910.78.90.17 – 10.78.90.2210.78.90.23
410.78.90.24/2910.78.90.25 – 10.78.90.3010.78.90.31
510.78.90.32/2910.78.90.33 – 10.78.90.3810.78.90.39
610.78.90.40/2910.78.90.41 – 10.78.90.4610.78.90.47
710.78.90.48/2910.78.90.49 – 10.78.90.5410.78.90.55
810.78.90.56/2910.78.90.57 – 10.78.90.6210.78.90.63
910.78.90.64/2910.78.90.65 – 10.78.90.7010.78.90.71
1010.78.90.72/2910.78.90.73 – 10.78.90.7810.78.90.79
1110.78.90.80/2910.78.90.81 – 10.78.90.8610.78.90.87
1210.78.90.88/2910.78.90.89 – 10.78.90.9410.78.90.95
1310.78.90.96/2910.78.90.97 – 10.78.90.10210.78.90.103
1410.78.90.104/2910.78.90.105 – 10.78.90.11010.78.90.111
1510.78.90.112/2910.78.90.113 – 10.78.90.11810.78.90.119
1610.78.90.120/2910.78.90.121 – 10.78.90.12610.78.90.127
1710.78.90.128/2910.78.90.129 – 10.78.90.13410.78.90.135
1810.78.90.136/2910.78.90.137 – 10.78.90.14210.78.90.143
1910.78.90.144/2910.78.90.145 – 10.78.90.15010.78.90.151
2010.78.90.152/2910.78.90.153 – 10.78.90.15810.78.90.159
2110.78.90.160/2910.78.90.161 – 10.78.90.16610.78.90.167
2210.78.90.168/2910.78.90.169 – 10.78.90.17410.78.90.175
2310.78.90.176/2910.78.90.177 – 10.78.90.18210.78.90.183
2410.78.90.184/2910.78.90.185 – 10.78.90.19010.78.90.191
2510.78.90.192/2910.78.90.193 – 10.78.90.19810.78.90.199
2610.78.90.200/2910.78.90.201 – 10.78.90.20610.78.90.207
2710.78.90.208/2910.78.90.209 – 10.78.90.21410.78.90.215
2810.78.90.216/2910.78.90.217 – 10.78.90.22210.78.90.223
2910.78.90.224/2910.78.90.225 – 10.78.90.23010.78.90.231
3010.78.90.232/2910.78.90.233 – 10.78.90.23810.78.90.239
3110.78.90.240/2910.78.90.241 – 10.78.90.24610.78.90.247
3210.78.90.248/2910.78.90.249 – 10.78.90.25410.78.90.255
3310.78.91.0/2910.78.91.1 – 10.78.91.610.78.91.7
3410.78.91.8/2910.78.91.9 – 10.78.91.1410.78.91.15
3510.78.91.16/2910.78.91.17 – 10.78.91.2210.78.91.23
3610.78.91.24/2910.78.91.25 – 10.78.91.3010.78.91.31
3710.78.91.32/2910.78.91.33 – 10.78.91.3810.78.91.39
3810.78.91.40/2910.78.91.41 – 10.78.91.4610.78.91.47
3910.78.91.48/2910.78.91.49 – 10.78.91.5410.78.91.55
4010.78.91.56/2910.78.91.57 – 10.78.91.6210.78.91.63
4110.78.91.64/2910.78.91.65 – 10.78.91.7010.78.91.71
4210.78.91.72/2910.78.91.73 – 10.78.91.7810.78.91.79
4310.78.91.80/2910.78.91.81 – 10.78.91.8610.78.91.87
4410.78.91.88/2910.78.91.89 – 10.78.91.9410.78.91.95
4510.78.91.96/2910.78.91.97 – 10.78.91.10210.78.91.103
4610.78.91.104/2910.78.91.105 – 10.78.91.11010.78.91.111
4710.78.91.112/2910.78.91.113 – 10.78.91.11810.78.91.119
4810.78.91.120/2910.78.91.121 – 10.78.91.12610.78.91.127
4910.78.91.128/2910.78.91.129 – 10.78.91.13410.78.91.135
5010.78.91.136/2910.78.91.137 – 10.78.91.14210.78.91.143
5110.78.91.144/2910.78.91.145 – 10.78.91.15010.78.91.151
5210.78.91.152/2910.78.91.153 – 10.78.91.15810.78.91.159
5310.78.91.160/2910.78.91.161 – 10.78.91.16610.78.91.167
5410.78.91.168/2910.78.91.169 – 10.78.91.17410.78.91.175
5510.78.91.176/2910.78.91.177 – 10.78.91.18210.78.91.183
5610.78.91.184/2910.78.91.185 – 10.78.91.19010.78.91.191
5710.78.91.192/2910.78.91.193 – 10.78.91.19810.78.91.199
5810.78.91.200/2910.78.91.201 – 10.78.91.20610.78.91.207
5910.78.91.208/2910.78.91.209 – 10.78.91.21410.78.91.215
6010.78.91.216/2910.78.91.217 – 10.78.91.22210.78.91.223
6110.78.91.224/2910.78.91.225 – 10.78.91.23010.78.91.231
6210.78.91.232/2910.78.91.233 – 10.78.91.23810.78.91.239
6310.78.91.240/2910.78.91.241 – 10.78.91.24610.78.91.247
6410.78.91.248/2910.78.91.249 – 10.78.91.25410.78.91.255
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 →