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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)10.66.167.0/24
network10.66.167.0/24
broadcast10.66.167.255
first host10.66.167.1
last host10.66.167.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.66.167.0/24
address00001010.01000010.10100111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000010.10100111.00000000
broadcast00001010.01000010.10100111.11111111
green = network part, grey = host part
hex0x0a42a700
decimal172140288
reverse dns0.167.66.10.in-addr.arpa
ipv4-mapped::ffff:a42:a700

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
110.66.167.0/2910.66.167.1 – 10.66.167.610.66.167.7
210.66.167.8/2910.66.167.9 – 10.66.167.1410.66.167.15
310.66.167.16/2910.66.167.17 – 10.66.167.2210.66.167.23
410.66.167.24/2910.66.167.25 – 10.66.167.3010.66.167.31
510.66.167.32/2910.66.167.33 – 10.66.167.3810.66.167.39
610.66.167.40/2910.66.167.41 – 10.66.167.4610.66.167.47
710.66.167.48/2910.66.167.49 – 10.66.167.5410.66.167.55
810.66.167.56/2910.66.167.57 – 10.66.167.6210.66.167.63
910.66.167.64/2910.66.167.65 – 10.66.167.7010.66.167.71
1010.66.167.72/2910.66.167.73 – 10.66.167.7810.66.167.79
1110.66.167.80/2910.66.167.81 – 10.66.167.8610.66.167.87
1210.66.167.88/2910.66.167.89 – 10.66.167.9410.66.167.95
1310.66.167.96/2910.66.167.97 – 10.66.167.10210.66.167.103
1410.66.167.104/2910.66.167.105 – 10.66.167.11010.66.167.111
1510.66.167.112/2910.66.167.113 – 10.66.167.11810.66.167.119
1610.66.167.120/2910.66.167.121 – 10.66.167.12610.66.167.127
1710.66.167.128/2910.66.167.129 – 10.66.167.13410.66.167.135
1810.66.167.136/2910.66.167.137 – 10.66.167.14210.66.167.143
1910.66.167.144/2910.66.167.145 – 10.66.167.15010.66.167.151
2010.66.167.152/2910.66.167.153 – 10.66.167.15810.66.167.159
2110.66.167.160/2910.66.167.161 – 10.66.167.16610.66.167.167
2210.66.167.168/2910.66.167.169 – 10.66.167.17410.66.167.175
2310.66.167.176/2910.66.167.177 – 10.66.167.18210.66.167.183
2410.66.167.184/2910.66.167.185 – 10.66.167.19010.66.167.191
2510.66.167.192/2910.66.167.193 – 10.66.167.19810.66.167.199
2610.66.167.200/2910.66.167.201 – 10.66.167.20610.66.167.207
2710.66.167.208/2910.66.167.209 – 10.66.167.21410.66.167.215
2810.66.167.216/2910.66.167.217 – 10.66.167.22210.66.167.223
2910.66.167.224/2910.66.167.225 – 10.66.167.23010.66.167.231
3010.66.167.232/2910.66.167.233 – 10.66.167.23810.66.167.239
3110.66.167.240/2910.66.167.241 – 10.66.167.24610.66.167.247
3210.66.167.248/2910.66.167.249 – 10.66.167.25410.66.167.255
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 →