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)10.76.42.0/23
network10.76.42.0/23
broadcast10.76.43.255
first host10.76.42.1
last host10.76.43.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.76.42.0/23
address00001010.01001100.00101010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001100.00101010.00000000
broadcast00001010.01001100.00101011.11111111
green = network part, grey = host part
hex0x0a4c2a00
decimal172763648
reverse dns0.42.76.10.in-addr.arpa
ipv4-mapped::ffff:a4c:2a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.76.42.0/2910.76.42.1 – 10.76.42.610.76.42.7
210.76.42.8/2910.76.42.9 – 10.76.42.1410.76.42.15
310.76.42.16/2910.76.42.17 – 10.76.42.2210.76.42.23
410.76.42.24/2910.76.42.25 – 10.76.42.3010.76.42.31
510.76.42.32/2910.76.42.33 – 10.76.42.3810.76.42.39
610.76.42.40/2910.76.42.41 – 10.76.42.4610.76.42.47
710.76.42.48/2910.76.42.49 – 10.76.42.5410.76.42.55
810.76.42.56/2910.76.42.57 – 10.76.42.6210.76.42.63
910.76.42.64/2910.76.42.65 – 10.76.42.7010.76.42.71
1010.76.42.72/2910.76.42.73 – 10.76.42.7810.76.42.79
1110.76.42.80/2910.76.42.81 – 10.76.42.8610.76.42.87
1210.76.42.88/2910.76.42.89 – 10.76.42.9410.76.42.95
1310.76.42.96/2910.76.42.97 – 10.76.42.10210.76.42.103
1410.76.42.104/2910.76.42.105 – 10.76.42.11010.76.42.111
1510.76.42.112/2910.76.42.113 – 10.76.42.11810.76.42.119
1610.76.42.120/2910.76.42.121 – 10.76.42.12610.76.42.127
1710.76.42.128/2910.76.42.129 – 10.76.42.13410.76.42.135
1810.76.42.136/2910.76.42.137 – 10.76.42.14210.76.42.143
1910.76.42.144/2910.76.42.145 – 10.76.42.15010.76.42.151
2010.76.42.152/2910.76.42.153 – 10.76.42.15810.76.42.159
2110.76.42.160/2910.76.42.161 – 10.76.42.16610.76.42.167
2210.76.42.168/2910.76.42.169 – 10.76.42.17410.76.42.175
2310.76.42.176/2910.76.42.177 – 10.76.42.18210.76.42.183
2410.76.42.184/2910.76.42.185 – 10.76.42.19010.76.42.191
2510.76.42.192/2910.76.42.193 – 10.76.42.19810.76.42.199
2610.76.42.200/2910.76.42.201 – 10.76.42.20610.76.42.207
2710.76.42.208/2910.76.42.209 – 10.76.42.21410.76.42.215
2810.76.42.216/2910.76.42.217 – 10.76.42.22210.76.42.223
2910.76.42.224/2910.76.42.225 – 10.76.42.23010.76.42.231
3010.76.42.232/2910.76.42.233 – 10.76.42.23810.76.42.239
3110.76.42.240/2910.76.42.241 – 10.76.42.24610.76.42.247
3210.76.42.248/2910.76.42.249 – 10.76.42.25410.76.42.255
3310.76.43.0/2910.76.43.1 – 10.76.43.610.76.43.7
3410.76.43.8/2910.76.43.9 – 10.76.43.1410.76.43.15
3510.76.43.16/2910.76.43.17 – 10.76.43.2210.76.43.23
3610.76.43.24/2910.76.43.25 – 10.76.43.3010.76.43.31
3710.76.43.32/2910.76.43.33 – 10.76.43.3810.76.43.39
3810.76.43.40/2910.76.43.41 – 10.76.43.4610.76.43.47
3910.76.43.48/2910.76.43.49 – 10.76.43.5410.76.43.55
4010.76.43.56/2910.76.43.57 – 10.76.43.6210.76.43.63
4110.76.43.64/2910.76.43.65 – 10.76.43.7010.76.43.71
4210.76.43.72/2910.76.43.73 – 10.76.43.7810.76.43.79
4310.76.43.80/2910.76.43.81 – 10.76.43.8610.76.43.87
4410.76.43.88/2910.76.43.89 – 10.76.43.9410.76.43.95
4510.76.43.96/2910.76.43.97 – 10.76.43.10210.76.43.103
4610.76.43.104/2910.76.43.105 – 10.76.43.11010.76.43.111
4710.76.43.112/2910.76.43.113 – 10.76.43.11810.76.43.119
4810.76.43.120/2910.76.43.121 – 10.76.43.12610.76.43.127
4910.76.43.128/2910.76.43.129 – 10.76.43.13410.76.43.135
5010.76.43.136/2910.76.43.137 – 10.76.43.14210.76.43.143
5110.76.43.144/2910.76.43.145 – 10.76.43.15010.76.43.151
5210.76.43.152/2910.76.43.153 – 10.76.43.15810.76.43.159
5310.76.43.160/2910.76.43.161 – 10.76.43.16610.76.43.167
5410.76.43.168/2910.76.43.169 – 10.76.43.17410.76.43.175
5510.76.43.176/2910.76.43.177 – 10.76.43.18210.76.43.183
5610.76.43.184/2910.76.43.185 – 10.76.43.19010.76.43.191
5710.76.43.192/2910.76.43.193 – 10.76.43.19810.76.43.199
5810.76.43.200/2910.76.43.201 – 10.76.43.20610.76.43.207
5910.76.43.208/2910.76.43.209 – 10.76.43.21410.76.43.215
6010.76.43.216/2910.76.43.217 – 10.76.43.22210.76.43.223
6110.76.43.224/2910.76.43.225 – 10.76.43.23010.76.43.231
6210.76.43.232/2910.76.43.233 – 10.76.43.23810.76.43.239
6310.76.43.240/2910.76.43.241 – 10.76.43.24610.76.43.247
6410.76.43.248/2910.76.43.249 – 10.76.43.25410.76.43.255
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 →