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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)10.7.10.0/23
network10.7.10.0/23
broadcast10.7.11.255
first host10.7.10.1
last host10.7.11.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.7.10.0/23
address00001010.00000111.00001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000111.00001010.00000000
broadcast00001010.00000111.00001011.11111111
green = network part, grey = host part
hex0x0a070a00
decimal168233472
reverse dns0.10.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.7.10.0/2910.7.10.1 – 10.7.10.610.7.10.7
210.7.10.8/2910.7.10.9 – 10.7.10.1410.7.10.15
310.7.10.16/2910.7.10.17 – 10.7.10.2210.7.10.23
410.7.10.24/2910.7.10.25 – 10.7.10.3010.7.10.31
510.7.10.32/2910.7.10.33 – 10.7.10.3810.7.10.39
610.7.10.40/2910.7.10.41 – 10.7.10.4610.7.10.47
710.7.10.48/2910.7.10.49 – 10.7.10.5410.7.10.55
810.7.10.56/2910.7.10.57 – 10.7.10.6210.7.10.63
910.7.10.64/2910.7.10.65 – 10.7.10.7010.7.10.71
1010.7.10.72/2910.7.10.73 – 10.7.10.7810.7.10.79
1110.7.10.80/2910.7.10.81 – 10.7.10.8610.7.10.87
1210.7.10.88/2910.7.10.89 – 10.7.10.9410.7.10.95
1310.7.10.96/2910.7.10.97 – 10.7.10.10210.7.10.103
1410.7.10.104/2910.7.10.105 – 10.7.10.11010.7.10.111
1510.7.10.112/2910.7.10.113 – 10.7.10.11810.7.10.119
1610.7.10.120/2910.7.10.121 – 10.7.10.12610.7.10.127
1710.7.10.128/2910.7.10.129 – 10.7.10.13410.7.10.135
1810.7.10.136/2910.7.10.137 – 10.7.10.14210.7.10.143
1910.7.10.144/2910.7.10.145 – 10.7.10.15010.7.10.151
2010.7.10.152/2910.7.10.153 – 10.7.10.15810.7.10.159
2110.7.10.160/2910.7.10.161 – 10.7.10.16610.7.10.167
2210.7.10.168/2910.7.10.169 – 10.7.10.17410.7.10.175
2310.7.10.176/2910.7.10.177 – 10.7.10.18210.7.10.183
2410.7.10.184/2910.7.10.185 – 10.7.10.19010.7.10.191
2510.7.10.192/2910.7.10.193 – 10.7.10.19810.7.10.199
2610.7.10.200/2910.7.10.201 – 10.7.10.20610.7.10.207
2710.7.10.208/2910.7.10.209 – 10.7.10.21410.7.10.215
2810.7.10.216/2910.7.10.217 – 10.7.10.22210.7.10.223
2910.7.10.224/2910.7.10.225 – 10.7.10.23010.7.10.231
3010.7.10.232/2910.7.10.233 – 10.7.10.23810.7.10.239
3110.7.10.240/2910.7.10.241 – 10.7.10.24610.7.10.247
3210.7.10.248/2910.7.10.249 – 10.7.10.25410.7.10.255
3310.7.11.0/2910.7.11.1 – 10.7.11.610.7.11.7
3410.7.11.8/2910.7.11.9 – 10.7.11.1410.7.11.15
3510.7.11.16/2910.7.11.17 – 10.7.11.2210.7.11.23
3610.7.11.24/2910.7.11.25 – 10.7.11.3010.7.11.31
3710.7.11.32/2910.7.11.33 – 10.7.11.3810.7.11.39
3810.7.11.40/2910.7.11.41 – 10.7.11.4610.7.11.47
3910.7.11.48/2910.7.11.49 – 10.7.11.5410.7.11.55
4010.7.11.56/2910.7.11.57 – 10.7.11.6210.7.11.63
4110.7.11.64/2910.7.11.65 – 10.7.11.7010.7.11.71
4210.7.11.72/2910.7.11.73 – 10.7.11.7810.7.11.79
4310.7.11.80/2910.7.11.81 – 10.7.11.8610.7.11.87
4410.7.11.88/2910.7.11.89 – 10.7.11.9410.7.11.95
4510.7.11.96/2910.7.11.97 – 10.7.11.10210.7.11.103
4610.7.11.104/2910.7.11.105 – 10.7.11.11010.7.11.111
4710.7.11.112/2910.7.11.113 – 10.7.11.11810.7.11.119
4810.7.11.120/2910.7.11.121 – 10.7.11.12610.7.11.127
4910.7.11.128/2910.7.11.129 – 10.7.11.13410.7.11.135
5010.7.11.136/2910.7.11.137 – 10.7.11.14210.7.11.143
5110.7.11.144/2910.7.11.145 – 10.7.11.15010.7.11.151
5210.7.11.152/2910.7.11.153 – 10.7.11.15810.7.11.159
5310.7.11.160/2910.7.11.161 – 10.7.11.16610.7.11.167
5410.7.11.168/2910.7.11.169 – 10.7.11.17410.7.11.175
5510.7.11.176/2910.7.11.177 – 10.7.11.18210.7.11.183
5610.7.11.184/2910.7.11.185 – 10.7.11.19010.7.11.191
5710.7.11.192/2910.7.11.193 – 10.7.11.19810.7.11.199
5810.7.11.200/2910.7.11.201 – 10.7.11.20610.7.11.207
5910.7.11.208/2910.7.11.209 – 10.7.11.21410.7.11.215
6010.7.11.216/2910.7.11.217 – 10.7.11.22210.7.11.223
6110.7.11.224/2910.7.11.225 – 10.7.11.23010.7.11.231
6210.7.11.232/2910.7.11.233 – 10.7.11.23810.7.11.239
6310.7.11.240/2910.7.11.241 – 10.7.11.24610.7.11.247
6410.7.11.248/2910.7.11.249 – 10.7.11.25410.7.11.255
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 →