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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)10.166.26.0/23
network10.166.26.0/23
broadcast10.166.27.255
first host10.166.26.1
last host10.166.27.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.166.26.0/23
address00001010.10100110.00011010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100110.00011010.00000000
broadcast00001010.10100110.00011011.11111111
green = network part, grey = host part
hex0x0aa61a00
decimal178657792
reverse dns0.26.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:1a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.26.0/2910.166.26.1 – 10.166.26.610.166.26.7
210.166.26.8/2910.166.26.9 – 10.166.26.1410.166.26.15
310.166.26.16/2910.166.26.17 – 10.166.26.2210.166.26.23
410.166.26.24/2910.166.26.25 – 10.166.26.3010.166.26.31
510.166.26.32/2910.166.26.33 – 10.166.26.3810.166.26.39
610.166.26.40/2910.166.26.41 – 10.166.26.4610.166.26.47
710.166.26.48/2910.166.26.49 – 10.166.26.5410.166.26.55
810.166.26.56/2910.166.26.57 – 10.166.26.6210.166.26.63
910.166.26.64/2910.166.26.65 – 10.166.26.7010.166.26.71
1010.166.26.72/2910.166.26.73 – 10.166.26.7810.166.26.79
1110.166.26.80/2910.166.26.81 – 10.166.26.8610.166.26.87
1210.166.26.88/2910.166.26.89 – 10.166.26.9410.166.26.95
1310.166.26.96/2910.166.26.97 – 10.166.26.10210.166.26.103
1410.166.26.104/2910.166.26.105 – 10.166.26.11010.166.26.111
1510.166.26.112/2910.166.26.113 – 10.166.26.11810.166.26.119
1610.166.26.120/2910.166.26.121 – 10.166.26.12610.166.26.127
1710.166.26.128/2910.166.26.129 – 10.166.26.13410.166.26.135
1810.166.26.136/2910.166.26.137 – 10.166.26.14210.166.26.143
1910.166.26.144/2910.166.26.145 – 10.166.26.15010.166.26.151
2010.166.26.152/2910.166.26.153 – 10.166.26.15810.166.26.159
2110.166.26.160/2910.166.26.161 – 10.166.26.16610.166.26.167
2210.166.26.168/2910.166.26.169 – 10.166.26.17410.166.26.175
2310.166.26.176/2910.166.26.177 – 10.166.26.18210.166.26.183
2410.166.26.184/2910.166.26.185 – 10.166.26.19010.166.26.191
2510.166.26.192/2910.166.26.193 – 10.166.26.19810.166.26.199
2610.166.26.200/2910.166.26.201 – 10.166.26.20610.166.26.207
2710.166.26.208/2910.166.26.209 – 10.166.26.21410.166.26.215
2810.166.26.216/2910.166.26.217 – 10.166.26.22210.166.26.223
2910.166.26.224/2910.166.26.225 – 10.166.26.23010.166.26.231
3010.166.26.232/2910.166.26.233 – 10.166.26.23810.166.26.239
3110.166.26.240/2910.166.26.241 – 10.166.26.24610.166.26.247
3210.166.26.248/2910.166.26.249 – 10.166.26.25410.166.26.255
3310.166.27.0/2910.166.27.1 – 10.166.27.610.166.27.7
3410.166.27.8/2910.166.27.9 – 10.166.27.1410.166.27.15
3510.166.27.16/2910.166.27.17 – 10.166.27.2210.166.27.23
3610.166.27.24/2910.166.27.25 – 10.166.27.3010.166.27.31
3710.166.27.32/2910.166.27.33 – 10.166.27.3810.166.27.39
3810.166.27.40/2910.166.27.41 – 10.166.27.4610.166.27.47
3910.166.27.48/2910.166.27.49 – 10.166.27.5410.166.27.55
4010.166.27.56/2910.166.27.57 – 10.166.27.6210.166.27.63
4110.166.27.64/2910.166.27.65 – 10.166.27.7010.166.27.71
4210.166.27.72/2910.166.27.73 – 10.166.27.7810.166.27.79
4310.166.27.80/2910.166.27.81 – 10.166.27.8610.166.27.87
4410.166.27.88/2910.166.27.89 – 10.166.27.9410.166.27.95
4510.166.27.96/2910.166.27.97 – 10.166.27.10210.166.27.103
4610.166.27.104/2910.166.27.105 – 10.166.27.11010.166.27.111
4710.166.27.112/2910.166.27.113 – 10.166.27.11810.166.27.119
4810.166.27.120/2910.166.27.121 – 10.166.27.12610.166.27.127
4910.166.27.128/2910.166.27.129 – 10.166.27.13410.166.27.135
5010.166.27.136/2910.166.27.137 – 10.166.27.14210.166.27.143
5110.166.27.144/2910.166.27.145 – 10.166.27.15010.166.27.151
5210.166.27.152/2910.166.27.153 – 10.166.27.15810.166.27.159
5310.166.27.160/2910.166.27.161 – 10.166.27.16610.166.27.167
5410.166.27.168/2910.166.27.169 – 10.166.27.17410.166.27.175
5510.166.27.176/2910.166.27.177 – 10.166.27.18210.166.27.183
5610.166.27.184/2910.166.27.185 – 10.166.27.19010.166.27.191
5710.166.27.192/2910.166.27.193 – 10.166.27.19810.166.27.199
5810.166.27.200/2910.166.27.201 – 10.166.27.20610.166.27.207
5910.166.27.208/2910.166.27.209 – 10.166.27.21410.166.27.215
6010.166.27.216/2910.166.27.217 – 10.166.27.22210.166.27.223
6110.166.27.224/2910.166.27.225 – 10.166.27.23010.166.27.231
6210.166.27.232/2910.166.27.233 – 10.166.27.23810.166.27.239
6310.166.27.240/2910.166.27.241 – 10.166.27.24610.166.27.247
6410.166.27.248/2910.166.27.249 – 10.166.27.25410.166.27.255
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 →