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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)10.166.8.0/23
network10.166.8.0/23
broadcast10.166.9.255
first host10.166.8.1
last host10.166.9.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.166.8.0/23
address00001010.10100110.00001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100110.00001000.00000000
broadcast00001010.10100110.00001001.11111111
green = network part, grey = host part
hex0x0aa60800
decimal178653184
reverse dns0.8.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.8.0/2910.166.8.1 – 10.166.8.610.166.8.7
210.166.8.8/2910.166.8.9 – 10.166.8.1410.166.8.15
310.166.8.16/2910.166.8.17 – 10.166.8.2210.166.8.23
410.166.8.24/2910.166.8.25 – 10.166.8.3010.166.8.31
510.166.8.32/2910.166.8.33 – 10.166.8.3810.166.8.39
610.166.8.40/2910.166.8.41 – 10.166.8.4610.166.8.47
710.166.8.48/2910.166.8.49 – 10.166.8.5410.166.8.55
810.166.8.56/2910.166.8.57 – 10.166.8.6210.166.8.63
910.166.8.64/2910.166.8.65 – 10.166.8.7010.166.8.71
1010.166.8.72/2910.166.8.73 – 10.166.8.7810.166.8.79
1110.166.8.80/2910.166.8.81 – 10.166.8.8610.166.8.87
1210.166.8.88/2910.166.8.89 – 10.166.8.9410.166.8.95
1310.166.8.96/2910.166.8.97 – 10.166.8.10210.166.8.103
1410.166.8.104/2910.166.8.105 – 10.166.8.11010.166.8.111
1510.166.8.112/2910.166.8.113 – 10.166.8.11810.166.8.119
1610.166.8.120/2910.166.8.121 – 10.166.8.12610.166.8.127
1710.166.8.128/2910.166.8.129 – 10.166.8.13410.166.8.135
1810.166.8.136/2910.166.8.137 – 10.166.8.14210.166.8.143
1910.166.8.144/2910.166.8.145 – 10.166.8.15010.166.8.151
2010.166.8.152/2910.166.8.153 – 10.166.8.15810.166.8.159
2110.166.8.160/2910.166.8.161 – 10.166.8.16610.166.8.167
2210.166.8.168/2910.166.8.169 – 10.166.8.17410.166.8.175
2310.166.8.176/2910.166.8.177 – 10.166.8.18210.166.8.183
2410.166.8.184/2910.166.8.185 – 10.166.8.19010.166.8.191
2510.166.8.192/2910.166.8.193 – 10.166.8.19810.166.8.199
2610.166.8.200/2910.166.8.201 – 10.166.8.20610.166.8.207
2710.166.8.208/2910.166.8.209 – 10.166.8.21410.166.8.215
2810.166.8.216/2910.166.8.217 – 10.166.8.22210.166.8.223
2910.166.8.224/2910.166.8.225 – 10.166.8.23010.166.8.231
3010.166.8.232/2910.166.8.233 – 10.166.8.23810.166.8.239
3110.166.8.240/2910.166.8.241 – 10.166.8.24610.166.8.247
3210.166.8.248/2910.166.8.249 – 10.166.8.25410.166.8.255
3310.166.9.0/2910.166.9.1 – 10.166.9.610.166.9.7
3410.166.9.8/2910.166.9.9 – 10.166.9.1410.166.9.15
3510.166.9.16/2910.166.9.17 – 10.166.9.2210.166.9.23
3610.166.9.24/2910.166.9.25 – 10.166.9.3010.166.9.31
3710.166.9.32/2910.166.9.33 – 10.166.9.3810.166.9.39
3810.166.9.40/2910.166.9.41 – 10.166.9.4610.166.9.47
3910.166.9.48/2910.166.9.49 – 10.166.9.5410.166.9.55
4010.166.9.56/2910.166.9.57 – 10.166.9.6210.166.9.63
4110.166.9.64/2910.166.9.65 – 10.166.9.7010.166.9.71
4210.166.9.72/2910.166.9.73 – 10.166.9.7810.166.9.79
4310.166.9.80/2910.166.9.81 – 10.166.9.8610.166.9.87
4410.166.9.88/2910.166.9.89 – 10.166.9.9410.166.9.95
4510.166.9.96/2910.166.9.97 – 10.166.9.10210.166.9.103
4610.166.9.104/2910.166.9.105 – 10.166.9.11010.166.9.111
4710.166.9.112/2910.166.9.113 – 10.166.9.11810.166.9.119
4810.166.9.120/2910.166.9.121 – 10.166.9.12610.166.9.127
4910.166.9.128/2910.166.9.129 – 10.166.9.13410.166.9.135
5010.166.9.136/2910.166.9.137 – 10.166.9.14210.166.9.143
5110.166.9.144/2910.166.9.145 – 10.166.9.15010.166.9.151
5210.166.9.152/2910.166.9.153 – 10.166.9.15810.166.9.159
5310.166.9.160/2910.166.9.161 – 10.166.9.16610.166.9.167
5410.166.9.168/2910.166.9.169 – 10.166.9.17410.166.9.175
5510.166.9.176/2910.166.9.177 – 10.166.9.18210.166.9.183
5610.166.9.184/2910.166.9.185 – 10.166.9.19010.166.9.191
5710.166.9.192/2910.166.9.193 – 10.166.9.19810.166.9.199
5810.166.9.200/2910.166.9.201 – 10.166.9.20610.166.9.207
5910.166.9.208/2910.166.9.209 – 10.166.9.21410.166.9.215
6010.166.9.216/2910.166.9.217 – 10.166.9.22210.166.9.223
6110.166.9.224/2910.166.9.225 – 10.166.9.23010.166.9.231
6210.166.9.232/2910.166.9.233 – 10.166.9.23810.166.9.239
6310.166.9.240/2910.166.9.241 – 10.166.9.24610.166.9.247
6410.166.9.248/2910.166.9.249 – 10.166.9.25410.166.9.255
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 →