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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)10.166.90.0/24
network10.166.90.0/24
broadcast10.166.90.255
first host10.166.90.1
last host10.166.90.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.166.90.0/24
address00001010.10100110.01011010.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100110.01011010.00000000
broadcast00001010.10100110.01011010.11111111
green = network part, grey = host part
hex0x0aa65a00
decimal178674176
reverse dns0.90.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:5a00

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.166.90.0/2910.166.90.1 – 10.166.90.610.166.90.7
210.166.90.8/2910.166.90.9 – 10.166.90.1410.166.90.15
310.166.90.16/2910.166.90.17 – 10.166.90.2210.166.90.23
410.166.90.24/2910.166.90.25 – 10.166.90.3010.166.90.31
510.166.90.32/2910.166.90.33 – 10.166.90.3810.166.90.39
610.166.90.40/2910.166.90.41 – 10.166.90.4610.166.90.47
710.166.90.48/2910.166.90.49 – 10.166.90.5410.166.90.55
810.166.90.56/2910.166.90.57 – 10.166.90.6210.166.90.63
910.166.90.64/2910.166.90.65 – 10.166.90.7010.166.90.71
1010.166.90.72/2910.166.90.73 – 10.166.90.7810.166.90.79
1110.166.90.80/2910.166.90.81 – 10.166.90.8610.166.90.87
1210.166.90.88/2910.166.90.89 – 10.166.90.9410.166.90.95
1310.166.90.96/2910.166.90.97 – 10.166.90.10210.166.90.103
1410.166.90.104/2910.166.90.105 – 10.166.90.11010.166.90.111
1510.166.90.112/2910.166.90.113 – 10.166.90.11810.166.90.119
1610.166.90.120/2910.166.90.121 – 10.166.90.12610.166.90.127
1710.166.90.128/2910.166.90.129 – 10.166.90.13410.166.90.135
1810.166.90.136/2910.166.90.137 – 10.166.90.14210.166.90.143
1910.166.90.144/2910.166.90.145 – 10.166.90.15010.166.90.151
2010.166.90.152/2910.166.90.153 – 10.166.90.15810.166.90.159
2110.166.90.160/2910.166.90.161 – 10.166.90.16610.166.90.167
2210.166.90.168/2910.166.90.169 – 10.166.90.17410.166.90.175
2310.166.90.176/2910.166.90.177 – 10.166.90.18210.166.90.183
2410.166.90.184/2910.166.90.185 – 10.166.90.19010.166.90.191
2510.166.90.192/2910.166.90.193 – 10.166.90.19810.166.90.199
2610.166.90.200/2910.166.90.201 – 10.166.90.20610.166.90.207
2710.166.90.208/2910.166.90.209 – 10.166.90.21410.166.90.215
2810.166.90.216/2910.166.90.217 – 10.166.90.22210.166.90.223
2910.166.90.224/2910.166.90.225 – 10.166.90.23010.166.90.231
3010.166.90.232/2910.166.90.233 – 10.166.90.23810.166.90.239
3110.166.90.240/2910.166.90.241 – 10.166.90.24610.166.90.247
3210.166.90.248/2910.166.90.249 – 10.166.90.25410.166.90.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/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-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →