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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)10.72.2.0/23
network10.72.2.0/23
broadcast10.72.3.255
first host10.72.2.1
last host10.72.3.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.72.2.0/23
address00001010.01001000.00000010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001000.00000010.00000000
broadcast00001010.01001000.00000011.11111111
green = network part, grey = host part
hex0x0a480200
decimal172491264
reverse dns0.2.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.2.0/2910.72.2.1 – 10.72.2.610.72.2.7
210.72.2.8/2910.72.2.9 – 10.72.2.1410.72.2.15
310.72.2.16/2910.72.2.17 – 10.72.2.2210.72.2.23
410.72.2.24/2910.72.2.25 – 10.72.2.3010.72.2.31
510.72.2.32/2910.72.2.33 – 10.72.2.3810.72.2.39
610.72.2.40/2910.72.2.41 – 10.72.2.4610.72.2.47
710.72.2.48/2910.72.2.49 – 10.72.2.5410.72.2.55
810.72.2.56/2910.72.2.57 – 10.72.2.6210.72.2.63
910.72.2.64/2910.72.2.65 – 10.72.2.7010.72.2.71
1010.72.2.72/2910.72.2.73 – 10.72.2.7810.72.2.79
1110.72.2.80/2910.72.2.81 – 10.72.2.8610.72.2.87
1210.72.2.88/2910.72.2.89 – 10.72.2.9410.72.2.95
1310.72.2.96/2910.72.2.97 – 10.72.2.10210.72.2.103
1410.72.2.104/2910.72.2.105 – 10.72.2.11010.72.2.111
1510.72.2.112/2910.72.2.113 – 10.72.2.11810.72.2.119
1610.72.2.120/2910.72.2.121 – 10.72.2.12610.72.2.127
1710.72.2.128/2910.72.2.129 – 10.72.2.13410.72.2.135
1810.72.2.136/2910.72.2.137 – 10.72.2.14210.72.2.143
1910.72.2.144/2910.72.2.145 – 10.72.2.15010.72.2.151
2010.72.2.152/2910.72.2.153 – 10.72.2.15810.72.2.159
2110.72.2.160/2910.72.2.161 – 10.72.2.16610.72.2.167
2210.72.2.168/2910.72.2.169 – 10.72.2.17410.72.2.175
2310.72.2.176/2910.72.2.177 – 10.72.2.18210.72.2.183
2410.72.2.184/2910.72.2.185 – 10.72.2.19010.72.2.191
2510.72.2.192/2910.72.2.193 – 10.72.2.19810.72.2.199
2610.72.2.200/2910.72.2.201 – 10.72.2.20610.72.2.207
2710.72.2.208/2910.72.2.209 – 10.72.2.21410.72.2.215
2810.72.2.216/2910.72.2.217 – 10.72.2.22210.72.2.223
2910.72.2.224/2910.72.2.225 – 10.72.2.23010.72.2.231
3010.72.2.232/2910.72.2.233 – 10.72.2.23810.72.2.239
3110.72.2.240/2910.72.2.241 – 10.72.2.24610.72.2.247
3210.72.2.248/2910.72.2.249 – 10.72.2.25410.72.2.255
3310.72.3.0/2910.72.3.1 – 10.72.3.610.72.3.7
3410.72.3.8/2910.72.3.9 – 10.72.3.1410.72.3.15
3510.72.3.16/2910.72.3.17 – 10.72.3.2210.72.3.23
3610.72.3.24/2910.72.3.25 – 10.72.3.3010.72.3.31
3710.72.3.32/2910.72.3.33 – 10.72.3.3810.72.3.39
3810.72.3.40/2910.72.3.41 – 10.72.3.4610.72.3.47
3910.72.3.48/2910.72.3.49 – 10.72.3.5410.72.3.55
4010.72.3.56/2910.72.3.57 – 10.72.3.6210.72.3.63
4110.72.3.64/2910.72.3.65 – 10.72.3.7010.72.3.71
4210.72.3.72/2910.72.3.73 – 10.72.3.7810.72.3.79
4310.72.3.80/2910.72.3.81 – 10.72.3.8610.72.3.87
4410.72.3.88/2910.72.3.89 – 10.72.3.9410.72.3.95
4510.72.3.96/2910.72.3.97 – 10.72.3.10210.72.3.103
4610.72.3.104/2910.72.3.105 – 10.72.3.11010.72.3.111
4710.72.3.112/2910.72.3.113 – 10.72.3.11810.72.3.119
4810.72.3.120/2910.72.3.121 – 10.72.3.12610.72.3.127
4910.72.3.128/2910.72.3.129 – 10.72.3.13410.72.3.135
5010.72.3.136/2910.72.3.137 – 10.72.3.14210.72.3.143
5110.72.3.144/2910.72.3.145 – 10.72.3.15010.72.3.151
5210.72.3.152/2910.72.3.153 – 10.72.3.15810.72.3.159
5310.72.3.160/2910.72.3.161 – 10.72.3.16610.72.3.167
5410.72.3.168/2910.72.3.169 – 10.72.3.17410.72.3.175
5510.72.3.176/2910.72.3.177 – 10.72.3.18210.72.3.183
5610.72.3.184/2910.72.3.185 – 10.72.3.19010.72.3.191
5710.72.3.192/2910.72.3.193 – 10.72.3.19810.72.3.199
5810.72.3.200/2910.72.3.201 – 10.72.3.20610.72.3.207
5910.72.3.208/2910.72.3.209 – 10.72.3.21410.72.3.215
6010.72.3.216/2910.72.3.217 – 10.72.3.22210.72.3.223
6110.72.3.224/2910.72.3.225 – 10.72.3.23010.72.3.231
6210.72.3.232/2910.72.3.233 – 10.72.3.23810.72.3.239
6310.72.3.240/2910.72.3.241 – 10.72.3.24610.72.3.247
6410.72.3.248/2910.72.3.249 – 10.72.3.25410.72.3.255
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 →