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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)10.72.76.0/23
network10.72.76.0/23
broadcast10.72.77.255
first host10.72.76.1
last host10.72.77.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.72.76.0/23
address00001010.01001000.01001100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001000.01001100.00000000
broadcast00001010.01001000.01001101.11111111
green = network part, grey = host part
hex0x0a484c00
decimal172510208
reverse dns0.76.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4c00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.76.0/2910.72.76.1 – 10.72.76.610.72.76.7
210.72.76.8/2910.72.76.9 – 10.72.76.1410.72.76.15
310.72.76.16/2910.72.76.17 – 10.72.76.2210.72.76.23
410.72.76.24/2910.72.76.25 – 10.72.76.3010.72.76.31
510.72.76.32/2910.72.76.33 – 10.72.76.3810.72.76.39
610.72.76.40/2910.72.76.41 – 10.72.76.4610.72.76.47
710.72.76.48/2910.72.76.49 – 10.72.76.5410.72.76.55
810.72.76.56/2910.72.76.57 – 10.72.76.6210.72.76.63
910.72.76.64/2910.72.76.65 – 10.72.76.7010.72.76.71
1010.72.76.72/2910.72.76.73 – 10.72.76.7810.72.76.79
1110.72.76.80/2910.72.76.81 – 10.72.76.8610.72.76.87
1210.72.76.88/2910.72.76.89 – 10.72.76.9410.72.76.95
1310.72.76.96/2910.72.76.97 – 10.72.76.10210.72.76.103
1410.72.76.104/2910.72.76.105 – 10.72.76.11010.72.76.111
1510.72.76.112/2910.72.76.113 – 10.72.76.11810.72.76.119
1610.72.76.120/2910.72.76.121 – 10.72.76.12610.72.76.127
1710.72.76.128/2910.72.76.129 – 10.72.76.13410.72.76.135
1810.72.76.136/2910.72.76.137 – 10.72.76.14210.72.76.143
1910.72.76.144/2910.72.76.145 – 10.72.76.15010.72.76.151
2010.72.76.152/2910.72.76.153 – 10.72.76.15810.72.76.159
2110.72.76.160/2910.72.76.161 – 10.72.76.16610.72.76.167
2210.72.76.168/2910.72.76.169 – 10.72.76.17410.72.76.175
2310.72.76.176/2910.72.76.177 – 10.72.76.18210.72.76.183
2410.72.76.184/2910.72.76.185 – 10.72.76.19010.72.76.191
2510.72.76.192/2910.72.76.193 – 10.72.76.19810.72.76.199
2610.72.76.200/2910.72.76.201 – 10.72.76.20610.72.76.207
2710.72.76.208/2910.72.76.209 – 10.72.76.21410.72.76.215
2810.72.76.216/2910.72.76.217 – 10.72.76.22210.72.76.223
2910.72.76.224/2910.72.76.225 – 10.72.76.23010.72.76.231
3010.72.76.232/2910.72.76.233 – 10.72.76.23810.72.76.239
3110.72.76.240/2910.72.76.241 – 10.72.76.24610.72.76.247
3210.72.76.248/2910.72.76.249 – 10.72.76.25410.72.76.255
3310.72.77.0/2910.72.77.1 – 10.72.77.610.72.77.7
3410.72.77.8/2910.72.77.9 – 10.72.77.1410.72.77.15
3510.72.77.16/2910.72.77.17 – 10.72.77.2210.72.77.23
3610.72.77.24/2910.72.77.25 – 10.72.77.3010.72.77.31
3710.72.77.32/2910.72.77.33 – 10.72.77.3810.72.77.39
3810.72.77.40/2910.72.77.41 – 10.72.77.4610.72.77.47
3910.72.77.48/2910.72.77.49 – 10.72.77.5410.72.77.55
4010.72.77.56/2910.72.77.57 – 10.72.77.6210.72.77.63
4110.72.77.64/2910.72.77.65 – 10.72.77.7010.72.77.71
4210.72.77.72/2910.72.77.73 – 10.72.77.7810.72.77.79
4310.72.77.80/2910.72.77.81 – 10.72.77.8610.72.77.87
4410.72.77.88/2910.72.77.89 – 10.72.77.9410.72.77.95
4510.72.77.96/2910.72.77.97 – 10.72.77.10210.72.77.103
4610.72.77.104/2910.72.77.105 – 10.72.77.11010.72.77.111
4710.72.77.112/2910.72.77.113 – 10.72.77.11810.72.77.119
4810.72.77.120/2910.72.77.121 – 10.72.77.12610.72.77.127
4910.72.77.128/2910.72.77.129 – 10.72.77.13410.72.77.135
5010.72.77.136/2910.72.77.137 – 10.72.77.14210.72.77.143
5110.72.77.144/2910.72.77.145 – 10.72.77.15010.72.77.151
5210.72.77.152/2910.72.77.153 – 10.72.77.15810.72.77.159
5310.72.77.160/2910.72.77.161 – 10.72.77.16610.72.77.167
5410.72.77.168/2910.72.77.169 – 10.72.77.17410.72.77.175
5510.72.77.176/2910.72.77.177 – 10.72.77.18210.72.77.183
5610.72.77.184/2910.72.77.185 – 10.72.77.19010.72.77.191
5710.72.77.192/2910.72.77.193 – 10.72.77.19810.72.77.199
5810.72.77.200/2910.72.77.201 – 10.72.77.20610.72.77.207
5910.72.77.208/2910.72.77.209 – 10.72.77.21410.72.77.215
6010.72.77.216/2910.72.77.217 – 10.72.77.22210.72.77.223
6110.72.77.224/2910.72.77.225 – 10.72.77.23010.72.77.231
6210.72.77.232/2910.72.77.233 – 10.72.77.23810.72.77.239
6310.72.77.240/2910.72.77.241 – 10.72.77.24610.72.77.247
6410.72.77.248/2910.72.77.249 – 10.72.77.25410.72.77.255
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 →