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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)10.78.82.0/23
network10.78.82.0/23
broadcast10.78.83.255
first host10.78.82.1
last host10.78.83.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.82.0/23
address00001010.01001110.01010010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.01010010.00000000
broadcast00001010.01001110.01010011.11111111
green = network part, grey = host part
hex0x0a4e5200
decimal172904960
reverse dns0.82.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:5200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.82.0/2910.78.82.1 – 10.78.82.610.78.82.7
210.78.82.8/2910.78.82.9 – 10.78.82.1410.78.82.15
310.78.82.16/2910.78.82.17 – 10.78.82.2210.78.82.23
410.78.82.24/2910.78.82.25 – 10.78.82.3010.78.82.31
510.78.82.32/2910.78.82.33 – 10.78.82.3810.78.82.39
610.78.82.40/2910.78.82.41 – 10.78.82.4610.78.82.47
710.78.82.48/2910.78.82.49 – 10.78.82.5410.78.82.55
810.78.82.56/2910.78.82.57 – 10.78.82.6210.78.82.63
910.78.82.64/2910.78.82.65 – 10.78.82.7010.78.82.71
1010.78.82.72/2910.78.82.73 – 10.78.82.7810.78.82.79
1110.78.82.80/2910.78.82.81 – 10.78.82.8610.78.82.87
1210.78.82.88/2910.78.82.89 – 10.78.82.9410.78.82.95
1310.78.82.96/2910.78.82.97 – 10.78.82.10210.78.82.103
1410.78.82.104/2910.78.82.105 – 10.78.82.11010.78.82.111
1510.78.82.112/2910.78.82.113 – 10.78.82.11810.78.82.119
1610.78.82.120/2910.78.82.121 – 10.78.82.12610.78.82.127
1710.78.82.128/2910.78.82.129 – 10.78.82.13410.78.82.135
1810.78.82.136/2910.78.82.137 – 10.78.82.14210.78.82.143
1910.78.82.144/2910.78.82.145 – 10.78.82.15010.78.82.151
2010.78.82.152/2910.78.82.153 – 10.78.82.15810.78.82.159
2110.78.82.160/2910.78.82.161 – 10.78.82.16610.78.82.167
2210.78.82.168/2910.78.82.169 – 10.78.82.17410.78.82.175
2310.78.82.176/2910.78.82.177 – 10.78.82.18210.78.82.183
2410.78.82.184/2910.78.82.185 – 10.78.82.19010.78.82.191
2510.78.82.192/2910.78.82.193 – 10.78.82.19810.78.82.199
2610.78.82.200/2910.78.82.201 – 10.78.82.20610.78.82.207
2710.78.82.208/2910.78.82.209 – 10.78.82.21410.78.82.215
2810.78.82.216/2910.78.82.217 – 10.78.82.22210.78.82.223
2910.78.82.224/2910.78.82.225 – 10.78.82.23010.78.82.231
3010.78.82.232/2910.78.82.233 – 10.78.82.23810.78.82.239
3110.78.82.240/2910.78.82.241 – 10.78.82.24610.78.82.247
3210.78.82.248/2910.78.82.249 – 10.78.82.25410.78.82.255
3310.78.83.0/2910.78.83.1 – 10.78.83.610.78.83.7
3410.78.83.8/2910.78.83.9 – 10.78.83.1410.78.83.15
3510.78.83.16/2910.78.83.17 – 10.78.83.2210.78.83.23
3610.78.83.24/2910.78.83.25 – 10.78.83.3010.78.83.31
3710.78.83.32/2910.78.83.33 – 10.78.83.3810.78.83.39
3810.78.83.40/2910.78.83.41 – 10.78.83.4610.78.83.47
3910.78.83.48/2910.78.83.49 – 10.78.83.5410.78.83.55
4010.78.83.56/2910.78.83.57 – 10.78.83.6210.78.83.63
4110.78.83.64/2910.78.83.65 – 10.78.83.7010.78.83.71
4210.78.83.72/2910.78.83.73 – 10.78.83.7810.78.83.79
4310.78.83.80/2910.78.83.81 – 10.78.83.8610.78.83.87
4410.78.83.88/2910.78.83.89 – 10.78.83.9410.78.83.95
4510.78.83.96/2910.78.83.97 – 10.78.83.10210.78.83.103
4610.78.83.104/2910.78.83.105 – 10.78.83.11010.78.83.111
4710.78.83.112/2910.78.83.113 – 10.78.83.11810.78.83.119
4810.78.83.120/2910.78.83.121 – 10.78.83.12610.78.83.127
4910.78.83.128/2910.78.83.129 – 10.78.83.13410.78.83.135
5010.78.83.136/2910.78.83.137 – 10.78.83.14210.78.83.143
5110.78.83.144/2910.78.83.145 – 10.78.83.15010.78.83.151
5210.78.83.152/2910.78.83.153 – 10.78.83.15810.78.83.159
5310.78.83.160/2910.78.83.161 – 10.78.83.16610.78.83.167
5410.78.83.168/2910.78.83.169 – 10.78.83.17410.78.83.175
5510.78.83.176/2910.78.83.177 – 10.78.83.18210.78.83.183
5610.78.83.184/2910.78.83.185 – 10.78.83.19010.78.83.191
5710.78.83.192/2910.78.83.193 – 10.78.83.19810.78.83.199
5810.78.83.200/2910.78.83.201 – 10.78.83.20610.78.83.207
5910.78.83.208/2910.78.83.209 – 10.78.83.21410.78.83.215
6010.78.83.216/2910.78.83.217 – 10.78.83.22210.78.83.223
6110.78.83.224/2910.78.83.225 – 10.78.83.23010.78.83.231
6210.78.83.232/2910.78.83.233 – 10.78.83.23810.78.83.239
6310.78.83.240/2910.78.83.241 – 10.78.83.24610.78.83.247
6410.78.83.248/2910.78.83.249 – 10.78.83.25410.78.83.255
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 →