ip
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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)10.78.187.0/24
network10.78.187.0/24
broadcast10.78.187.255
first host10.78.187.1
last host10.78.187.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.78.187.0/24
address00001010.01001110.10111011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001110.10111011.00000000
broadcast00001010.01001110.10111011.11111111
green = network part, grey = host part
hex0x0a4ebb00
decimal172931840
reverse dns0.187.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:bb00

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.187.0/2910.78.187.1 – 10.78.187.610.78.187.7
210.78.187.8/2910.78.187.9 – 10.78.187.1410.78.187.15
310.78.187.16/2910.78.187.17 – 10.78.187.2210.78.187.23
410.78.187.24/2910.78.187.25 – 10.78.187.3010.78.187.31
510.78.187.32/2910.78.187.33 – 10.78.187.3810.78.187.39
610.78.187.40/2910.78.187.41 – 10.78.187.4610.78.187.47
710.78.187.48/2910.78.187.49 – 10.78.187.5410.78.187.55
810.78.187.56/2910.78.187.57 – 10.78.187.6210.78.187.63
910.78.187.64/2910.78.187.65 – 10.78.187.7010.78.187.71
1010.78.187.72/2910.78.187.73 – 10.78.187.7810.78.187.79
1110.78.187.80/2910.78.187.81 – 10.78.187.8610.78.187.87
1210.78.187.88/2910.78.187.89 – 10.78.187.9410.78.187.95
1310.78.187.96/2910.78.187.97 – 10.78.187.10210.78.187.103
1410.78.187.104/2910.78.187.105 – 10.78.187.11010.78.187.111
1510.78.187.112/2910.78.187.113 – 10.78.187.11810.78.187.119
1610.78.187.120/2910.78.187.121 – 10.78.187.12610.78.187.127
1710.78.187.128/2910.78.187.129 – 10.78.187.13410.78.187.135
1810.78.187.136/2910.78.187.137 – 10.78.187.14210.78.187.143
1910.78.187.144/2910.78.187.145 – 10.78.187.15010.78.187.151
2010.78.187.152/2910.78.187.153 – 10.78.187.15810.78.187.159
2110.78.187.160/2910.78.187.161 – 10.78.187.16610.78.187.167
2210.78.187.168/2910.78.187.169 – 10.78.187.17410.78.187.175
2310.78.187.176/2910.78.187.177 – 10.78.187.18210.78.187.183
2410.78.187.184/2910.78.187.185 – 10.78.187.19010.78.187.191
2510.78.187.192/2910.78.187.193 – 10.78.187.19810.78.187.199
2610.78.187.200/2910.78.187.201 – 10.78.187.20610.78.187.207
2710.78.187.208/2910.78.187.209 – 10.78.187.21410.78.187.215
2810.78.187.216/2910.78.187.217 – 10.78.187.22210.78.187.223
2910.78.187.224/2910.78.187.225 – 10.78.187.23010.78.187.231
3010.78.187.232/2910.78.187.233 – 10.78.187.23810.78.187.239
3110.78.187.240/2910.78.187.241 – 10.78.187.24610.78.187.247
3210.78.187.248/2910.78.187.249 – 10.78.187.25410.78.187.255
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 →