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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)10.89.74.0/23
network10.89.74.0/23
broadcast10.89.75.255
first host10.89.74.1
last host10.89.75.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.89.74.0/23
address00001010.01011001.01001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01011001.01001010.00000000
broadcast00001010.01011001.01001011.11111111
green = network part, grey = host part
hex0x0a594a00
decimal173623808
reverse dns0.74.89.10.in-addr.arpa
ipv4-mapped::ffff:a59:4a00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.89.74.0/2910.89.74.1 – 10.89.74.610.89.74.7
210.89.74.8/2910.89.74.9 – 10.89.74.1410.89.74.15
310.89.74.16/2910.89.74.17 – 10.89.74.2210.89.74.23
410.89.74.24/2910.89.74.25 – 10.89.74.3010.89.74.31
510.89.74.32/2910.89.74.33 – 10.89.74.3810.89.74.39
610.89.74.40/2910.89.74.41 – 10.89.74.4610.89.74.47
710.89.74.48/2910.89.74.49 – 10.89.74.5410.89.74.55
810.89.74.56/2910.89.74.57 – 10.89.74.6210.89.74.63
910.89.74.64/2910.89.74.65 – 10.89.74.7010.89.74.71
1010.89.74.72/2910.89.74.73 – 10.89.74.7810.89.74.79
1110.89.74.80/2910.89.74.81 – 10.89.74.8610.89.74.87
1210.89.74.88/2910.89.74.89 – 10.89.74.9410.89.74.95
1310.89.74.96/2910.89.74.97 – 10.89.74.10210.89.74.103
1410.89.74.104/2910.89.74.105 – 10.89.74.11010.89.74.111
1510.89.74.112/2910.89.74.113 – 10.89.74.11810.89.74.119
1610.89.74.120/2910.89.74.121 – 10.89.74.12610.89.74.127
1710.89.74.128/2910.89.74.129 – 10.89.74.13410.89.74.135
1810.89.74.136/2910.89.74.137 – 10.89.74.14210.89.74.143
1910.89.74.144/2910.89.74.145 – 10.89.74.15010.89.74.151
2010.89.74.152/2910.89.74.153 – 10.89.74.15810.89.74.159
2110.89.74.160/2910.89.74.161 – 10.89.74.16610.89.74.167
2210.89.74.168/2910.89.74.169 – 10.89.74.17410.89.74.175
2310.89.74.176/2910.89.74.177 – 10.89.74.18210.89.74.183
2410.89.74.184/2910.89.74.185 – 10.89.74.19010.89.74.191
2510.89.74.192/2910.89.74.193 – 10.89.74.19810.89.74.199
2610.89.74.200/2910.89.74.201 – 10.89.74.20610.89.74.207
2710.89.74.208/2910.89.74.209 – 10.89.74.21410.89.74.215
2810.89.74.216/2910.89.74.217 – 10.89.74.22210.89.74.223
2910.89.74.224/2910.89.74.225 – 10.89.74.23010.89.74.231
3010.89.74.232/2910.89.74.233 – 10.89.74.23810.89.74.239
3110.89.74.240/2910.89.74.241 – 10.89.74.24610.89.74.247
3210.89.74.248/2910.89.74.249 – 10.89.74.25410.89.74.255
3310.89.75.0/2910.89.75.1 – 10.89.75.610.89.75.7
3410.89.75.8/2910.89.75.9 – 10.89.75.1410.89.75.15
3510.89.75.16/2910.89.75.17 – 10.89.75.2210.89.75.23
3610.89.75.24/2910.89.75.25 – 10.89.75.3010.89.75.31
3710.89.75.32/2910.89.75.33 – 10.89.75.3810.89.75.39
3810.89.75.40/2910.89.75.41 – 10.89.75.4610.89.75.47
3910.89.75.48/2910.89.75.49 – 10.89.75.5410.89.75.55
4010.89.75.56/2910.89.75.57 – 10.89.75.6210.89.75.63
4110.89.75.64/2910.89.75.65 – 10.89.75.7010.89.75.71
4210.89.75.72/2910.89.75.73 – 10.89.75.7810.89.75.79
4310.89.75.80/2910.89.75.81 – 10.89.75.8610.89.75.87
4410.89.75.88/2910.89.75.89 – 10.89.75.9410.89.75.95
4510.89.75.96/2910.89.75.97 – 10.89.75.10210.89.75.103
4610.89.75.104/2910.89.75.105 – 10.89.75.11010.89.75.111
4710.89.75.112/2910.89.75.113 – 10.89.75.11810.89.75.119
4810.89.75.120/2910.89.75.121 – 10.89.75.12610.89.75.127
4910.89.75.128/2910.89.75.129 – 10.89.75.13410.89.75.135
5010.89.75.136/2910.89.75.137 – 10.89.75.14210.89.75.143
5110.89.75.144/2910.89.75.145 – 10.89.75.15010.89.75.151
5210.89.75.152/2910.89.75.153 – 10.89.75.15810.89.75.159
5310.89.75.160/2910.89.75.161 – 10.89.75.16610.89.75.167
5410.89.75.168/2910.89.75.169 – 10.89.75.17410.89.75.175
5510.89.75.176/2910.89.75.177 – 10.89.75.18210.89.75.183
5610.89.75.184/2910.89.75.185 – 10.89.75.19010.89.75.191
5710.89.75.192/2910.89.75.193 – 10.89.75.19810.89.75.199
5810.89.75.200/2910.89.75.201 – 10.89.75.20610.89.75.207
5910.89.75.208/2910.89.75.209 – 10.89.75.21410.89.75.215
6010.89.75.216/2910.89.75.217 – 10.89.75.22210.89.75.223
6110.89.75.224/2910.89.75.225 – 10.89.75.23010.89.75.231
6210.89.75.232/2910.89.75.233 – 10.89.75.23810.89.75.239
6310.89.75.240/2910.89.75.241 – 10.89.75.24610.89.75.247
6410.89.75.248/2910.89.75.249 – 10.89.75.25410.89.75.255
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 →