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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)10.1.222.0/23
network10.1.222.0/23
broadcast10.1.223.255
first host10.1.222.1
last host10.1.223.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.222.0/23
address00001010.00000001.11011110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11011110.00000000
broadcast00001010.00000001.11011111.11111111
green = network part, grey = host part
hex0x0a01de00
decimal167894528
reverse dns0.222.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:de00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.222.0/2910.1.222.1 – 10.1.222.610.1.222.7
210.1.222.8/2910.1.222.9 – 10.1.222.1410.1.222.15
310.1.222.16/2910.1.222.17 – 10.1.222.2210.1.222.23
410.1.222.24/2910.1.222.25 – 10.1.222.3010.1.222.31
510.1.222.32/2910.1.222.33 – 10.1.222.3810.1.222.39
610.1.222.40/2910.1.222.41 – 10.1.222.4610.1.222.47
710.1.222.48/2910.1.222.49 – 10.1.222.5410.1.222.55
810.1.222.56/2910.1.222.57 – 10.1.222.6210.1.222.63
910.1.222.64/2910.1.222.65 – 10.1.222.7010.1.222.71
1010.1.222.72/2910.1.222.73 – 10.1.222.7810.1.222.79
1110.1.222.80/2910.1.222.81 – 10.1.222.8610.1.222.87
1210.1.222.88/2910.1.222.89 – 10.1.222.9410.1.222.95
1310.1.222.96/2910.1.222.97 – 10.1.222.10210.1.222.103
1410.1.222.104/2910.1.222.105 – 10.1.222.11010.1.222.111
1510.1.222.112/2910.1.222.113 – 10.1.222.11810.1.222.119
1610.1.222.120/2910.1.222.121 – 10.1.222.12610.1.222.127
1710.1.222.128/2910.1.222.129 – 10.1.222.13410.1.222.135
1810.1.222.136/2910.1.222.137 – 10.1.222.14210.1.222.143
1910.1.222.144/2910.1.222.145 – 10.1.222.15010.1.222.151
2010.1.222.152/2910.1.222.153 – 10.1.222.15810.1.222.159
2110.1.222.160/2910.1.222.161 – 10.1.222.16610.1.222.167
2210.1.222.168/2910.1.222.169 – 10.1.222.17410.1.222.175
2310.1.222.176/2910.1.222.177 – 10.1.222.18210.1.222.183
2410.1.222.184/2910.1.222.185 – 10.1.222.19010.1.222.191
2510.1.222.192/2910.1.222.193 – 10.1.222.19810.1.222.199
2610.1.222.200/2910.1.222.201 – 10.1.222.20610.1.222.207
2710.1.222.208/2910.1.222.209 – 10.1.222.21410.1.222.215
2810.1.222.216/2910.1.222.217 – 10.1.222.22210.1.222.223
2910.1.222.224/2910.1.222.225 – 10.1.222.23010.1.222.231
3010.1.222.232/2910.1.222.233 – 10.1.222.23810.1.222.239
3110.1.222.240/2910.1.222.241 – 10.1.222.24610.1.222.247
3210.1.222.248/2910.1.222.249 – 10.1.222.25410.1.222.255
3310.1.223.0/2910.1.223.1 – 10.1.223.610.1.223.7
3410.1.223.8/2910.1.223.9 – 10.1.223.1410.1.223.15
3510.1.223.16/2910.1.223.17 – 10.1.223.2210.1.223.23
3610.1.223.24/2910.1.223.25 – 10.1.223.3010.1.223.31
3710.1.223.32/2910.1.223.33 – 10.1.223.3810.1.223.39
3810.1.223.40/2910.1.223.41 – 10.1.223.4610.1.223.47
3910.1.223.48/2910.1.223.49 – 10.1.223.5410.1.223.55
4010.1.223.56/2910.1.223.57 – 10.1.223.6210.1.223.63
4110.1.223.64/2910.1.223.65 – 10.1.223.7010.1.223.71
4210.1.223.72/2910.1.223.73 – 10.1.223.7810.1.223.79
4310.1.223.80/2910.1.223.81 – 10.1.223.8610.1.223.87
4410.1.223.88/2910.1.223.89 – 10.1.223.9410.1.223.95
4510.1.223.96/2910.1.223.97 – 10.1.223.10210.1.223.103
4610.1.223.104/2910.1.223.105 – 10.1.223.11010.1.223.111
4710.1.223.112/2910.1.223.113 – 10.1.223.11810.1.223.119
4810.1.223.120/2910.1.223.121 – 10.1.223.12610.1.223.127
4910.1.223.128/2910.1.223.129 – 10.1.223.13410.1.223.135
5010.1.223.136/2910.1.223.137 – 10.1.223.14210.1.223.143
5110.1.223.144/2910.1.223.145 – 10.1.223.15010.1.223.151
5210.1.223.152/2910.1.223.153 – 10.1.223.15810.1.223.159
5310.1.223.160/2910.1.223.161 – 10.1.223.16610.1.223.167
5410.1.223.168/2910.1.223.169 – 10.1.223.17410.1.223.175
5510.1.223.176/2910.1.223.177 – 10.1.223.18210.1.223.183
5610.1.223.184/2910.1.223.185 – 10.1.223.19010.1.223.191
5710.1.223.192/2910.1.223.193 – 10.1.223.19810.1.223.199
5810.1.223.200/2910.1.223.201 – 10.1.223.20610.1.223.207
5910.1.223.208/2910.1.223.209 – 10.1.223.21410.1.223.215
6010.1.223.216/2910.1.223.217 – 10.1.223.22210.1.223.223
6110.1.223.224/2910.1.223.225 – 10.1.223.23010.1.223.231
6210.1.223.232/2910.1.223.233 – 10.1.223.23810.1.223.239
6310.1.223.240/2910.1.223.241 – 10.1.223.24610.1.223.247
6410.1.223.248/2910.1.223.249 – 10.1.223.25410.1.223.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →