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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)10.2.87.0/24
network10.2.87.0/24
broadcast10.2.87.255
first host10.2.87.1
last host10.2.87.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.87.0/24
address00001010.00000010.01010111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.01010111.00000000
broadcast00001010.00000010.01010111.11111111
green = network part, grey = host part
hex0x0a025700
decimal167925504
reverse dns0.87.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5700

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.87.0/2910.2.87.1 – 10.2.87.610.2.87.7
210.2.87.8/2910.2.87.9 – 10.2.87.1410.2.87.15
310.2.87.16/2910.2.87.17 – 10.2.87.2210.2.87.23
410.2.87.24/2910.2.87.25 – 10.2.87.3010.2.87.31
510.2.87.32/2910.2.87.33 – 10.2.87.3810.2.87.39
610.2.87.40/2910.2.87.41 – 10.2.87.4610.2.87.47
710.2.87.48/2910.2.87.49 – 10.2.87.5410.2.87.55
810.2.87.56/2910.2.87.57 – 10.2.87.6210.2.87.63
910.2.87.64/2910.2.87.65 – 10.2.87.7010.2.87.71
1010.2.87.72/2910.2.87.73 – 10.2.87.7810.2.87.79
1110.2.87.80/2910.2.87.81 – 10.2.87.8610.2.87.87
1210.2.87.88/2910.2.87.89 – 10.2.87.9410.2.87.95
1310.2.87.96/2910.2.87.97 – 10.2.87.10210.2.87.103
1410.2.87.104/2910.2.87.105 – 10.2.87.11010.2.87.111
1510.2.87.112/2910.2.87.113 – 10.2.87.11810.2.87.119
1610.2.87.120/2910.2.87.121 – 10.2.87.12610.2.87.127
1710.2.87.128/2910.2.87.129 – 10.2.87.13410.2.87.135
1810.2.87.136/2910.2.87.137 – 10.2.87.14210.2.87.143
1910.2.87.144/2910.2.87.145 – 10.2.87.15010.2.87.151
2010.2.87.152/2910.2.87.153 – 10.2.87.15810.2.87.159
2110.2.87.160/2910.2.87.161 – 10.2.87.16610.2.87.167
2210.2.87.168/2910.2.87.169 – 10.2.87.17410.2.87.175
2310.2.87.176/2910.2.87.177 – 10.2.87.18210.2.87.183
2410.2.87.184/2910.2.87.185 – 10.2.87.19010.2.87.191
2510.2.87.192/2910.2.87.193 – 10.2.87.19810.2.87.199
2610.2.87.200/2910.2.87.201 – 10.2.87.20610.2.87.207
2710.2.87.208/2910.2.87.209 – 10.2.87.21410.2.87.215
2810.2.87.216/2910.2.87.217 – 10.2.87.22210.2.87.223
2910.2.87.224/2910.2.87.225 – 10.2.87.23010.2.87.231
3010.2.87.232/2910.2.87.233 – 10.2.87.23810.2.87.239
3110.2.87.240/2910.2.87.241 – 10.2.87.24610.2.87.247
3210.2.87.248/2910.2.87.249 – 10.2.87.25410.2.87.255
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 →