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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)10.85.166.0/23
network10.85.166.0/23
broadcast10.85.167.255
first host10.85.166.1
last host10.85.167.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.85.166.0/23
address00001010.01010101.10100110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01010101.10100110.00000000
broadcast00001010.01010101.10100111.11111111
green = network part, grey = host part
hex0x0a55a600
decimal173385216
reverse dns0.166.85.10.in-addr.arpa
ipv4-mapped::ffff:a55:a600

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.85.166.0/2910.85.166.1 – 10.85.166.610.85.166.7
210.85.166.8/2910.85.166.9 – 10.85.166.1410.85.166.15
310.85.166.16/2910.85.166.17 – 10.85.166.2210.85.166.23
410.85.166.24/2910.85.166.25 – 10.85.166.3010.85.166.31
510.85.166.32/2910.85.166.33 – 10.85.166.3810.85.166.39
610.85.166.40/2910.85.166.41 – 10.85.166.4610.85.166.47
710.85.166.48/2910.85.166.49 – 10.85.166.5410.85.166.55
810.85.166.56/2910.85.166.57 – 10.85.166.6210.85.166.63
910.85.166.64/2910.85.166.65 – 10.85.166.7010.85.166.71
1010.85.166.72/2910.85.166.73 – 10.85.166.7810.85.166.79
1110.85.166.80/2910.85.166.81 – 10.85.166.8610.85.166.87
1210.85.166.88/2910.85.166.89 – 10.85.166.9410.85.166.95
1310.85.166.96/2910.85.166.97 – 10.85.166.10210.85.166.103
1410.85.166.104/2910.85.166.105 – 10.85.166.11010.85.166.111
1510.85.166.112/2910.85.166.113 – 10.85.166.11810.85.166.119
1610.85.166.120/2910.85.166.121 – 10.85.166.12610.85.166.127
1710.85.166.128/2910.85.166.129 – 10.85.166.13410.85.166.135
1810.85.166.136/2910.85.166.137 – 10.85.166.14210.85.166.143
1910.85.166.144/2910.85.166.145 – 10.85.166.15010.85.166.151
2010.85.166.152/2910.85.166.153 – 10.85.166.15810.85.166.159
2110.85.166.160/2910.85.166.161 – 10.85.166.16610.85.166.167
2210.85.166.168/2910.85.166.169 – 10.85.166.17410.85.166.175
2310.85.166.176/2910.85.166.177 – 10.85.166.18210.85.166.183
2410.85.166.184/2910.85.166.185 – 10.85.166.19010.85.166.191
2510.85.166.192/2910.85.166.193 – 10.85.166.19810.85.166.199
2610.85.166.200/2910.85.166.201 – 10.85.166.20610.85.166.207
2710.85.166.208/2910.85.166.209 – 10.85.166.21410.85.166.215
2810.85.166.216/2910.85.166.217 – 10.85.166.22210.85.166.223
2910.85.166.224/2910.85.166.225 – 10.85.166.23010.85.166.231
3010.85.166.232/2910.85.166.233 – 10.85.166.23810.85.166.239
3110.85.166.240/2910.85.166.241 – 10.85.166.24610.85.166.247
3210.85.166.248/2910.85.166.249 – 10.85.166.25410.85.166.255
3310.85.167.0/2910.85.167.1 – 10.85.167.610.85.167.7
3410.85.167.8/2910.85.167.9 – 10.85.167.1410.85.167.15
3510.85.167.16/2910.85.167.17 – 10.85.167.2210.85.167.23
3610.85.167.24/2910.85.167.25 – 10.85.167.3010.85.167.31
3710.85.167.32/2910.85.167.33 – 10.85.167.3810.85.167.39
3810.85.167.40/2910.85.167.41 – 10.85.167.4610.85.167.47
3910.85.167.48/2910.85.167.49 – 10.85.167.5410.85.167.55
4010.85.167.56/2910.85.167.57 – 10.85.167.6210.85.167.63
4110.85.167.64/2910.85.167.65 – 10.85.167.7010.85.167.71
4210.85.167.72/2910.85.167.73 – 10.85.167.7810.85.167.79
4310.85.167.80/2910.85.167.81 – 10.85.167.8610.85.167.87
4410.85.167.88/2910.85.167.89 – 10.85.167.9410.85.167.95
4510.85.167.96/2910.85.167.97 – 10.85.167.10210.85.167.103
4610.85.167.104/2910.85.167.105 – 10.85.167.11010.85.167.111
4710.85.167.112/2910.85.167.113 – 10.85.167.11810.85.167.119
4810.85.167.120/2910.85.167.121 – 10.85.167.12610.85.167.127
4910.85.167.128/2910.85.167.129 – 10.85.167.13410.85.167.135
5010.85.167.136/2910.85.167.137 – 10.85.167.14210.85.167.143
5110.85.167.144/2910.85.167.145 – 10.85.167.15010.85.167.151
5210.85.167.152/2910.85.167.153 – 10.85.167.15810.85.167.159
5310.85.167.160/2910.85.167.161 – 10.85.167.16610.85.167.167
5410.85.167.168/2910.85.167.169 – 10.85.167.17410.85.167.175
5510.85.167.176/2910.85.167.177 – 10.85.167.18210.85.167.183
5610.85.167.184/2910.85.167.185 – 10.85.167.19010.85.167.191
5710.85.167.192/2910.85.167.193 – 10.85.167.19810.85.167.199
5810.85.167.200/2910.85.167.201 – 10.85.167.20610.85.167.207
5910.85.167.208/2910.85.167.209 – 10.85.167.21410.85.167.215
6010.85.167.216/2910.85.167.217 – 10.85.167.22210.85.167.223
6110.85.167.224/2910.85.167.225 – 10.85.167.23010.85.167.231
6210.85.167.232/2910.85.167.233 – 10.85.167.23810.85.167.239
6310.85.167.240/2910.85.167.241 – 10.85.167.24610.85.167.247
6410.85.167.248/2910.85.167.249 – 10.85.167.25410.85.167.255
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 →