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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)10.0.106.0/23
network10.0.106.0/23
broadcast10.0.107.255
first host10.0.106.1
last host10.0.107.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.106.0/23
address00001010.00000000.01101010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.01101010.00000000
broadcast00001010.00000000.01101011.11111111
green = network part, grey = host part
hex0x0a006a00
decimal167799296
reverse dns0.106.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:6a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.106.0/2910.0.106.1 – 10.0.106.610.0.106.7
210.0.106.8/2910.0.106.9 – 10.0.106.1410.0.106.15
310.0.106.16/2910.0.106.17 – 10.0.106.2210.0.106.23
410.0.106.24/2910.0.106.25 – 10.0.106.3010.0.106.31
510.0.106.32/2910.0.106.33 – 10.0.106.3810.0.106.39
610.0.106.40/2910.0.106.41 – 10.0.106.4610.0.106.47
710.0.106.48/2910.0.106.49 – 10.0.106.5410.0.106.55
810.0.106.56/2910.0.106.57 – 10.0.106.6210.0.106.63
910.0.106.64/2910.0.106.65 – 10.0.106.7010.0.106.71
1010.0.106.72/2910.0.106.73 – 10.0.106.7810.0.106.79
1110.0.106.80/2910.0.106.81 – 10.0.106.8610.0.106.87
1210.0.106.88/2910.0.106.89 – 10.0.106.9410.0.106.95
1310.0.106.96/2910.0.106.97 – 10.0.106.10210.0.106.103
1410.0.106.104/2910.0.106.105 – 10.0.106.11010.0.106.111
1510.0.106.112/2910.0.106.113 – 10.0.106.11810.0.106.119
1610.0.106.120/2910.0.106.121 – 10.0.106.12610.0.106.127
1710.0.106.128/2910.0.106.129 – 10.0.106.13410.0.106.135
1810.0.106.136/2910.0.106.137 – 10.0.106.14210.0.106.143
1910.0.106.144/2910.0.106.145 – 10.0.106.15010.0.106.151
2010.0.106.152/2910.0.106.153 – 10.0.106.15810.0.106.159
2110.0.106.160/2910.0.106.161 – 10.0.106.16610.0.106.167
2210.0.106.168/2910.0.106.169 – 10.0.106.17410.0.106.175
2310.0.106.176/2910.0.106.177 – 10.0.106.18210.0.106.183
2410.0.106.184/2910.0.106.185 – 10.0.106.19010.0.106.191
2510.0.106.192/2910.0.106.193 – 10.0.106.19810.0.106.199
2610.0.106.200/2910.0.106.201 – 10.0.106.20610.0.106.207
2710.0.106.208/2910.0.106.209 – 10.0.106.21410.0.106.215
2810.0.106.216/2910.0.106.217 – 10.0.106.22210.0.106.223
2910.0.106.224/2910.0.106.225 – 10.0.106.23010.0.106.231
3010.0.106.232/2910.0.106.233 – 10.0.106.23810.0.106.239
3110.0.106.240/2910.0.106.241 – 10.0.106.24610.0.106.247
3210.0.106.248/2910.0.106.249 – 10.0.106.25410.0.106.255
3310.0.107.0/2910.0.107.1 – 10.0.107.610.0.107.7
3410.0.107.8/2910.0.107.9 – 10.0.107.1410.0.107.15
3510.0.107.16/2910.0.107.17 – 10.0.107.2210.0.107.23
3610.0.107.24/2910.0.107.25 – 10.0.107.3010.0.107.31
3710.0.107.32/2910.0.107.33 – 10.0.107.3810.0.107.39
3810.0.107.40/2910.0.107.41 – 10.0.107.4610.0.107.47
3910.0.107.48/2910.0.107.49 – 10.0.107.5410.0.107.55
4010.0.107.56/2910.0.107.57 – 10.0.107.6210.0.107.63
4110.0.107.64/2910.0.107.65 – 10.0.107.7010.0.107.71
4210.0.107.72/2910.0.107.73 – 10.0.107.7810.0.107.79
4310.0.107.80/2910.0.107.81 – 10.0.107.8610.0.107.87
4410.0.107.88/2910.0.107.89 – 10.0.107.9410.0.107.95
4510.0.107.96/2910.0.107.97 – 10.0.107.10210.0.107.103
4610.0.107.104/2910.0.107.105 – 10.0.107.11010.0.107.111
4710.0.107.112/2910.0.107.113 – 10.0.107.11810.0.107.119
4810.0.107.120/2910.0.107.121 – 10.0.107.12610.0.107.127
4910.0.107.128/2910.0.107.129 – 10.0.107.13410.0.107.135
5010.0.107.136/2910.0.107.137 – 10.0.107.14210.0.107.143
5110.0.107.144/2910.0.107.145 – 10.0.107.15010.0.107.151
5210.0.107.152/2910.0.107.153 – 10.0.107.15810.0.107.159
5310.0.107.160/2910.0.107.161 – 10.0.107.16610.0.107.167
5410.0.107.168/2910.0.107.169 – 10.0.107.17410.0.107.175
5510.0.107.176/2910.0.107.177 – 10.0.107.18210.0.107.183
5610.0.107.184/2910.0.107.185 – 10.0.107.19010.0.107.191
5710.0.107.192/2910.0.107.193 – 10.0.107.19810.0.107.199
5810.0.107.200/2910.0.107.201 – 10.0.107.20610.0.107.207
5910.0.107.208/2910.0.107.209 – 10.0.107.21410.0.107.215
6010.0.107.216/2910.0.107.217 – 10.0.107.22210.0.107.223
6110.0.107.224/2910.0.107.225 – 10.0.107.23010.0.107.231
6210.0.107.232/2910.0.107.233 – 10.0.107.23810.0.107.239
6310.0.107.240/2910.0.107.241 – 10.0.107.24610.0.107.247
6410.0.107.248/2910.0.107.249 – 10.0.107.25410.0.107.255
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 →