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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)10.3.12.0/24
network10.3.12.0/24
broadcast10.3.12.255
first host10.3.12.1
last host10.3.12.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.3.12.0/24
address00001010.00000011.00001100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000011.00001100.00000000
broadcast00001010.00000011.00001100.11111111
green = network part, grey = host part
hex0x0a030c00
decimal167971840
reverse dns0.12.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:c00

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.12.0/2910.3.12.1 – 10.3.12.610.3.12.7
210.3.12.8/2910.3.12.9 – 10.3.12.1410.3.12.15
310.3.12.16/2910.3.12.17 – 10.3.12.2210.3.12.23
410.3.12.24/2910.3.12.25 – 10.3.12.3010.3.12.31
510.3.12.32/2910.3.12.33 – 10.3.12.3810.3.12.39
610.3.12.40/2910.3.12.41 – 10.3.12.4610.3.12.47
710.3.12.48/2910.3.12.49 – 10.3.12.5410.3.12.55
810.3.12.56/2910.3.12.57 – 10.3.12.6210.3.12.63
910.3.12.64/2910.3.12.65 – 10.3.12.7010.3.12.71
1010.3.12.72/2910.3.12.73 – 10.3.12.7810.3.12.79
1110.3.12.80/2910.3.12.81 – 10.3.12.8610.3.12.87
1210.3.12.88/2910.3.12.89 – 10.3.12.9410.3.12.95
1310.3.12.96/2910.3.12.97 – 10.3.12.10210.3.12.103
1410.3.12.104/2910.3.12.105 – 10.3.12.11010.3.12.111
1510.3.12.112/2910.3.12.113 – 10.3.12.11810.3.12.119
1610.3.12.120/2910.3.12.121 – 10.3.12.12610.3.12.127
1710.3.12.128/2910.3.12.129 – 10.3.12.13410.3.12.135
1810.3.12.136/2910.3.12.137 – 10.3.12.14210.3.12.143
1910.3.12.144/2910.3.12.145 – 10.3.12.15010.3.12.151
2010.3.12.152/2910.3.12.153 – 10.3.12.15810.3.12.159
2110.3.12.160/2910.3.12.161 – 10.3.12.16610.3.12.167
2210.3.12.168/2910.3.12.169 – 10.3.12.17410.3.12.175
2310.3.12.176/2910.3.12.177 – 10.3.12.18210.3.12.183
2410.3.12.184/2910.3.12.185 – 10.3.12.19010.3.12.191
2510.3.12.192/2910.3.12.193 – 10.3.12.19810.3.12.199
2610.3.12.200/2910.3.12.201 – 10.3.12.20610.3.12.207
2710.3.12.208/2910.3.12.209 – 10.3.12.21410.3.12.215
2810.3.12.216/2910.3.12.217 – 10.3.12.22210.3.12.223
2910.3.12.224/2910.3.12.225 – 10.3.12.23010.3.12.231
3010.3.12.232/2910.3.12.233 – 10.3.12.23810.3.12.239
3110.3.12.240/2910.3.12.241 – 10.3.12.24610.3.12.247
3210.3.12.248/2910.3.12.249 – 10.3.12.25410.3.12.255
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 →