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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)10.210.64.0/23
network10.210.64.0/23
broadcast10.210.65.255
first host10.210.64.1
last host10.210.65.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.210.64.0/23
address00001010.11010010.01000000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11010010.01000000.00000000
broadcast00001010.11010010.01000001.11111111
green = network part, grey = host part
hex0x0ad24000
decimal181551104
reverse dns0.64.210.10.in-addr.arpa
ipv4-mapped::ffff:ad2:4000

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.210.64.0/2910.210.64.1 – 10.210.64.610.210.64.7
210.210.64.8/2910.210.64.9 – 10.210.64.1410.210.64.15
310.210.64.16/2910.210.64.17 – 10.210.64.2210.210.64.23
410.210.64.24/2910.210.64.25 – 10.210.64.3010.210.64.31
510.210.64.32/2910.210.64.33 – 10.210.64.3810.210.64.39
610.210.64.40/2910.210.64.41 – 10.210.64.4610.210.64.47
710.210.64.48/2910.210.64.49 – 10.210.64.5410.210.64.55
810.210.64.56/2910.210.64.57 – 10.210.64.6210.210.64.63
910.210.64.64/2910.210.64.65 – 10.210.64.7010.210.64.71
1010.210.64.72/2910.210.64.73 – 10.210.64.7810.210.64.79
1110.210.64.80/2910.210.64.81 – 10.210.64.8610.210.64.87
1210.210.64.88/2910.210.64.89 – 10.210.64.9410.210.64.95
1310.210.64.96/2910.210.64.97 – 10.210.64.10210.210.64.103
1410.210.64.104/2910.210.64.105 – 10.210.64.11010.210.64.111
1510.210.64.112/2910.210.64.113 – 10.210.64.11810.210.64.119
1610.210.64.120/2910.210.64.121 – 10.210.64.12610.210.64.127
1710.210.64.128/2910.210.64.129 – 10.210.64.13410.210.64.135
1810.210.64.136/2910.210.64.137 – 10.210.64.14210.210.64.143
1910.210.64.144/2910.210.64.145 – 10.210.64.15010.210.64.151
2010.210.64.152/2910.210.64.153 – 10.210.64.15810.210.64.159
2110.210.64.160/2910.210.64.161 – 10.210.64.16610.210.64.167
2210.210.64.168/2910.210.64.169 – 10.210.64.17410.210.64.175
2310.210.64.176/2910.210.64.177 – 10.210.64.18210.210.64.183
2410.210.64.184/2910.210.64.185 – 10.210.64.19010.210.64.191
2510.210.64.192/2910.210.64.193 – 10.210.64.19810.210.64.199
2610.210.64.200/2910.210.64.201 – 10.210.64.20610.210.64.207
2710.210.64.208/2910.210.64.209 – 10.210.64.21410.210.64.215
2810.210.64.216/2910.210.64.217 – 10.210.64.22210.210.64.223
2910.210.64.224/2910.210.64.225 – 10.210.64.23010.210.64.231
3010.210.64.232/2910.210.64.233 – 10.210.64.23810.210.64.239
3110.210.64.240/2910.210.64.241 – 10.210.64.24610.210.64.247
3210.210.64.248/2910.210.64.249 – 10.210.64.25410.210.64.255
3310.210.65.0/2910.210.65.1 – 10.210.65.610.210.65.7
3410.210.65.8/2910.210.65.9 – 10.210.65.1410.210.65.15
3510.210.65.16/2910.210.65.17 – 10.210.65.2210.210.65.23
3610.210.65.24/2910.210.65.25 – 10.210.65.3010.210.65.31
3710.210.65.32/2910.210.65.33 – 10.210.65.3810.210.65.39
3810.210.65.40/2910.210.65.41 – 10.210.65.4610.210.65.47
3910.210.65.48/2910.210.65.49 – 10.210.65.5410.210.65.55
4010.210.65.56/2910.210.65.57 – 10.210.65.6210.210.65.63
4110.210.65.64/2910.210.65.65 – 10.210.65.7010.210.65.71
4210.210.65.72/2910.210.65.73 – 10.210.65.7810.210.65.79
4310.210.65.80/2910.210.65.81 – 10.210.65.8610.210.65.87
4410.210.65.88/2910.210.65.89 – 10.210.65.9410.210.65.95
4510.210.65.96/2910.210.65.97 – 10.210.65.10210.210.65.103
4610.210.65.104/2910.210.65.105 – 10.210.65.11010.210.65.111
4710.210.65.112/2910.210.65.113 – 10.210.65.11810.210.65.119
4810.210.65.120/2910.210.65.121 – 10.210.65.12610.210.65.127
4910.210.65.128/2910.210.65.129 – 10.210.65.13410.210.65.135
5010.210.65.136/2910.210.65.137 – 10.210.65.14210.210.65.143
5110.210.65.144/2910.210.65.145 – 10.210.65.15010.210.65.151
5210.210.65.152/2910.210.65.153 – 10.210.65.15810.210.65.159
5310.210.65.160/2910.210.65.161 – 10.210.65.16610.210.65.167
5410.210.65.168/2910.210.65.169 – 10.210.65.17410.210.65.175
5510.210.65.176/2910.210.65.177 – 10.210.65.18210.210.65.183
5610.210.65.184/2910.210.65.185 – 10.210.65.19010.210.65.191
5710.210.65.192/2910.210.65.193 – 10.210.65.19810.210.65.199
5810.210.65.200/2910.210.65.201 – 10.210.65.20610.210.65.207
5910.210.65.208/2910.210.65.209 – 10.210.65.21410.210.65.215
6010.210.65.216/2910.210.65.217 – 10.210.65.22210.210.65.223
6110.210.65.224/2910.210.65.225 – 10.210.65.23010.210.65.231
6210.210.65.232/2910.210.65.233 – 10.210.65.23810.210.65.239
6310.210.65.240/2910.210.65.241 – 10.210.65.24610.210.65.247
6410.210.65.248/2910.210.65.249 – 10.210.65.25410.210.65.255
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 →