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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)10.78.67.0/24
network10.78.67.0/24
broadcast10.78.67.255
first host10.78.67.1
last host10.78.67.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.78.67.0/24
address00001010.01001110.01000011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001110.01000011.00000000
broadcast00001010.01001110.01000011.11111111
green = network part, grey = host part
hex0x0a4e4300
decimal172901120
reverse dns0.67.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:4300

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.67.0/2910.78.67.1 – 10.78.67.610.78.67.7
210.78.67.8/2910.78.67.9 – 10.78.67.1410.78.67.15
310.78.67.16/2910.78.67.17 – 10.78.67.2210.78.67.23
410.78.67.24/2910.78.67.25 – 10.78.67.3010.78.67.31
510.78.67.32/2910.78.67.33 – 10.78.67.3810.78.67.39
610.78.67.40/2910.78.67.41 – 10.78.67.4610.78.67.47
710.78.67.48/2910.78.67.49 – 10.78.67.5410.78.67.55
810.78.67.56/2910.78.67.57 – 10.78.67.6210.78.67.63
910.78.67.64/2910.78.67.65 – 10.78.67.7010.78.67.71
1010.78.67.72/2910.78.67.73 – 10.78.67.7810.78.67.79
1110.78.67.80/2910.78.67.81 – 10.78.67.8610.78.67.87
1210.78.67.88/2910.78.67.89 – 10.78.67.9410.78.67.95
1310.78.67.96/2910.78.67.97 – 10.78.67.10210.78.67.103
1410.78.67.104/2910.78.67.105 – 10.78.67.11010.78.67.111
1510.78.67.112/2910.78.67.113 – 10.78.67.11810.78.67.119
1610.78.67.120/2910.78.67.121 – 10.78.67.12610.78.67.127
1710.78.67.128/2910.78.67.129 – 10.78.67.13410.78.67.135
1810.78.67.136/2910.78.67.137 – 10.78.67.14210.78.67.143
1910.78.67.144/2910.78.67.145 – 10.78.67.15010.78.67.151
2010.78.67.152/2910.78.67.153 – 10.78.67.15810.78.67.159
2110.78.67.160/2910.78.67.161 – 10.78.67.16610.78.67.167
2210.78.67.168/2910.78.67.169 – 10.78.67.17410.78.67.175
2310.78.67.176/2910.78.67.177 – 10.78.67.18210.78.67.183
2410.78.67.184/2910.78.67.185 – 10.78.67.19010.78.67.191
2510.78.67.192/2910.78.67.193 – 10.78.67.19810.78.67.199
2610.78.67.200/2910.78.67.201 – 10.78.67.20610.78.67.207
2710.78.67.208/2910.78.67.209 – 10.78.67.21410.78.67.215
2810.78.67.216/2910.78.67.217 – 10.78.67.22210.78.67.223
2910.78.67.224/2910.78.67.225 – 10.78.67.23010.78.67.231
3010.78.67.232/2910.78.67.233 – 10.78.67.23810.78.67.239
3110.78.67.240/2910.78.67.241 – 10.78.67.24610.78.67.247
3210.78.67.248/2910.78.67.249 – 10.78.67.25410.78.67.255
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 →