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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)10.166.80.0/23
network10.166.80.0/23
broadcast10.166.81.255
first host10.166.80.1
last host10.166.81.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.166.80.0/23
address00001010.10100110.01010000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100110.01010000.00000000
broadcast00001010.10100110.01010001.11111111
green = network part, grey = host part
hex0x0aa65000
decimal178671616
reverse dns0.80.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:5000

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.80.0/2910.166.80.1 – 10.166.80.610.166.80.7
210.166.80.8/2910.166.80.9 – 10.166.80.1410.166.80.15
310.166.80.16/2910.166.80.17 – 10.166.80.2210.166.80.23
410.166.80.24/2910.166.80.25 – 10.166.80.3010.166.80.31
510.166.80.32/2910.166.80.33 – 10.166.80.3810.166.80.39
610.166.80.40/2910.166.80.41 – 10.166.80.4610.166.80.47
710.166.80.48/2910.166.80.49 – 10.166.80.5410.166.80.55
810.166.80.56/2910.166.80.57 – 10.166.80.6210.166.80.63
910.166.80.64/2910.166.80.65 – 10.166.80.7010.166.80.71
1010.166.80.72/2910.166.80.73 – 10.166.80.7810.166.80.79
1110.166.80.80/2910.166.80.81 – 10.166.80.8610.166.80.87
1210.166.80.88/2910.166.80.89 – 10.166.80.9410.166.80.95
1310.166.80.96/2910.166.80.97 – 10.166.80.10210.166.80.103
1410.166.80.104/2910.166.80.105 – 10.166.80.11010.166.80.111
1510.166.80.112/2910.166.80.113 – 10.166.80.11810.166.80.119
1610.166.80.120/2910.166.80.121 – 10.166.80.12610.166.80.127
1710.166.80.128/2910.166.80.129 – 10.166.80.13410.166.80.135
1810.166.80.136/2910.166.80.137 – 10.166.80.14210.166.80.143
1910.166.80.144/2910.166.80.145 – 10.166.80.15010.166.80.151
2010.166.80.152/2910.166.80.153 – 10.166.80.15810.166.80.159
2110.166.80.160/2910.166.80.161 – 10.166.80.16610.166.80.167
2210.166.80.168/2910.166.80.169 – 10.166.80.17410.166.80.175
2310.166.80.176/2910.166.80.177 – 10.166.80.18210.166.80.183
2410.166.80.184/2910.166.80.185 – 10.166.80.19010.166.80.191
2510.166.80.192/2910.166.80.193 – 10.166.80.19810.166.80.199
2610.166.80.200/2910.166.80.201 – 10.166.80.20610.166.80.207
2710.166.80.208/2910.166.80.209 – 10.166.80.21410.166.80.215
2810.166.80.216/2910.166.80.217 – 10.166.80.22210.166.80.223
2910.166.80.224/2910.166.80.225 – 10.166.80.23010.166.80.231
3010.166.80.232/2910.166.80.233 – 10.166.80.23810.166.80.239
3110.166.80.240/2910.166.80.241 – 10.166.80.24610.166.80.247
3210.166.80.248/2910.166.80.249 – 10.166.80.25410.166.80.255
3310.166.81.0/2910.166.81.1 – 10.166.81.610.166.81.7
3410.166.81.8/2910.166.81.9 – 10.166.81.1410.166.81.15
3510.166.81.16/2910.166.81.17 – 10.166.81.2210.166.81.23
3610.166.81.24/2910.166.81.25 – 10.166.81.3010.166.81.31
3710.166.81.32/2910.166.81.33 – 10.166.81.3810.166.81.39
3810.166.81.40/2910.166.81.41 – 10.166.81.4610.166.81.47
3910.166.81.48/2910.166.81.49 – 10.166.81.5410.166.81.55
4010.166.81.56/2910.166.81.57 – 10.166.81.6210.166.81.63
4110.166.81.64/2910.166.81.65 – 10.166.81.7010.166.81.71
4210.166.81.72/2910.166.81.73 – 10.166.81.7810.166.81.79
4310.166.81.80/2910.166.81.81 – 10.166.81.8610.166.81.87
4410.166.81.88/2910.166.81.89 – 10.166.81.9410.166.81.95
4510.166.81.96/2910.166.81.97 – 10.166.81.10210.166.81.103
4610.166.81.104/2910.166.81.105 – 10.166.81.11010.166.81.111
4710.166.81.112/2910.166.81.113 – 10.166.81.11810.166.81.119
4810.166.81.120/2910.166.81.121 – 10.166.81.12610.166.81.127
4910.166.81.128/2910.166.81.129 – 10.166.81.13410.166.81.135
5010.166.81.136/2910.166.81.137 – 10.166.81.14210.166.81.143
5110.166.81.144/2910.166.81.145 – 10.166.81.15010.166.81.151
5210.166.81.152/2910.166.81.153 – 10.166.81.15810.166.81.159
5310.166.81.160/2910.166.81.161 – 10.166.81.16610.166.81.167
5410.166.81.168/2910.166.81.169 – 10.166.81.17410.166.81.175
5510.166.81.176/2910.166.81.177 – 10.166.81.18210.166.81.183
5610.166.81.184/2910.166.81.185 – 10.166.81.19010.166.81.191
5710.166.81.192/2910.166.81.193 – 10.166.81.19810.166.81.199
5810.166.81.200/2910.166.81.201 – 10.166.81.20610.166.81.207
5910.166.81.208/2910.166.81.209 – 10.166.81.21410.166.81.215
6010.166.81.216/2910.166.81.217 – 10.166.81.22210.166.81.223
6110.166.81.224/2910.166.81.225 – 10.166.81.23010.166.81.231
6210.166.81.232/2910.166.81.233 – 10.166.81.23810.166.81.239
6310.166.81.240/2910.166.81.241 – 10.166.81.24610.166.81.247
6410.166.81.248/2910.166.81.249 – 10.166.81.25410.166.81.255
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 →