ip
ipku.in

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)10.1.216.0/23
network10.1.216.0/23
broadcast10.1.217.255
first host10.1.216.1
last host10.1.217.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.216.0/23
address00001010.00000001.11011000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11011000.00000000
broadcast00001010.00000001.11011001.11111111
green = network part, grey = host part
hex0x0a01d800
decimal167892992
reverse dns0.216.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:d800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.216.0/2910.1.216.1 – 10.1.216.610.1.216.7
210.1.216.8/2910.1.216.9 – 10.1.216.1410.1.216.15
310.1.216.16/2910.1.216.17 – 10.1.216.2210.1.216.23
410.1.216.24/2910.1.216.25 – 10.1.216.3010.1.216.31
510.1.216.32/2910.1.216.33 – 10.1.216.3810.1.216.39
610.1.216.40/2910.1.216.41 – 10.1.216.4610.1.216.47
710.1.216.48/2910.1.216.49 – 10.1.216.5410.1.216.55
810.1.216.56/2910.1.216.57 – 10.1.216.6210.1.216.63
910.1.216.64/2910.1.216.65 – 10.1.216.7010.1.216.71
1010.1.216.72/2910.1.216.73 – 10.1.216.7810.1.216.79
1110.1.216.80/2910.1.216.81 – 10.1.216.8610.1.216.87
1210.1.216.88/2910.1.216.89 – 10.1.216.9410.1.216.95
1310.1.216.96/2910.1.216.97 – 10.1.216.10210.1.216.103
1410.1.216.104/2910.1.216.105 – 10.1.216.11010.1.216.111
1510.1.216.112/2910.1.216.113 – 10.1.216.11810.1.216.119
1610.1.216.120/2910.1.216.121 – 10.1.216.12610.1.216.127
1710.1.216.128/2910.1.216.129 – 10.1.216.13410.1.216.135
1810.1.216.136/2910.1.216.137 – 10.1.216.14210.1.216.143
1910.1.216.144/2910.1.216.145 – 10.1.216.15010.1.216.151
2010.1.216.152/2910.1.216.153 – 10.1.216.15810.1.216.159
2110.1.216.160/2910.1.216.161 – 10.1.216.16610.1.216.167
2210.1.216.168/2910.1.216.169 – 10.1.216.17410.1.216.175
2310.1.216.176/2910.1.216.177 – 10.1.216.18210.1.216.183
2410.1.216.184/2910.1.216.185 – 10.1.216.19010.1.216.191
2510.1.216.192/2910.1.216.193 – 10.1.216.19810.1.216.199
2610.1.216.200/2910.1.216.201 – 10.1.216.20610.1.216.207
2710.1.216.208/2910.1.216.209 – 10.1.216.21410.1.216.215
2810.1.216.216/2910.1.216.217 – 10.1.216.22210.1.216.223
2910.1.216.224/2910.1.216.225 – 10.1.216.23010.1.216.231
3010.1.216.232/2910.1.216.233 – 10.1.216.23810.1.216.239
3110.1.216.240/2910.1.216.241 – 10.1.216.24610.1.216.247
3210.1.216.248/2910.1.216.249 – 10.1.216.25410.1.216.255
3310.1.217.0/2910.1.217.1 – 10.1.217.610.1.217.7
3410.1.217.8/2910.1.217.9 – 10.1.217.1410.1.217.15
3510.1.217.16/2910.1.217.17 – 10.1.217.2210.1.217.23
3610.1.217.24/2910.1.217.25 – 10.1.217.3010.1.217.31
3710.1.217.32/2910.1.217.33 – 10.1.217.3810.1.217.39
3810.1.217.40/2910.1.217.41 – 10.1.217.4610.1.217.47
3910.1.217.48/2910.1.217.49 – 10.1.217.5410.1.217.55
4010.1.217.56/2910.1.217.57 – 10.1.217.6210.1.217.63
4110.1.217.64/2910.1.217.65 – 10.1.217.7010.1.217.71
4210.1.217.72/2910.1.217.73 – 10.1.217.7810.1.217.79
4310.1.217.80/2910.1.217.81 – 10.1.217.8610.1.217.87
4410.1.217.88/2910.1.217.89 – 10.1.217.9410.1.217.95
4510.1.217.96/2910.1.217.97 – 10.1.217.10210.1.217.103
4610.1.217.104/2910.1.217.105 – 10.1.217.11010.1.217.111
4710.1.217.112/2910.1.217.113 – 10.1.217.11810.1.217.119
4810.1.217.120/2910.1.217.121 – 10.1.217.12610.1.217.127
4910.1.217.128/2910.1.217.129 – 10.1.217.13410.1.217.135
5010.1.217.136/2910.1.217.137 – 10.1.217.14210.1.217.143
5110.1.217.144/2910.1.217.145 – 10.1.217.15010.1.217.151
5210.1.217.152/2910.1.217.153 – 10.1.217.15810.1.217.159
5310.1.217.160/2910.1.217.161 – 10.1.217.16610.1.217.167
5410.1.217.168/2910.1.217.169 – 10.1.217.17410.1.217.175
5510.1.217.176/2910.1.217.177 – 10.1.217.18210.1.217.183
5610.1.217.184/2910.1.217.185 – 10.1.217.19010.1.217.191
5710.1.217.192/2910.1.217.193 – 10.1.217.19810.1.217.199
5810.1.217.200/2910.1.217.201 – 10.1.217.20610.1.217.207
5910.1.217.208/2910.1.217.209 – 10.1.217.21410.1.217.215
6010.1.217.216/2910.1.217.217 – 10.1.217.22210.1.217.223
6110.1.217.224/2910.1.217.225 – 10.1.217.23010.1.217.231
6210.1.217.232/2910.1.217.233 – 10.1.217.23810.1.217.239
6310.1.217.240/2910.1.217.241 – 10.1.217.24610.1.217.247
6410.1.217.248/2910.1.217.249 – 10.1.217.25410.1.217.255
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 →