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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)10.1.220.0/23
network10.1.220.0/23
broadcast10.1.221.255
first host10.1.220.1
last host10.1.221.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.220.0/23
address00001010.00000001.11011100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.11011100.00000000
broadcast00001010.00000001.11011101.11111111
green = network part, grey = host part
hex0x0a01dc00
decimal167894016
reverse dns0.220.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:dc00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.220.0/2910.1.220.1 – 10.1.220.610.1.220.7
210.1.220.8/2910.1.220.9 – 10.1.220.1410.1.220.15
310.1.220.16/2910.1.220.17 – 10.1.220.2210.1.220.23
410.1.220.24/2910.1.220.25 – 10.1.220.3010.1.220.31
510.1.220.32/2910.1.220.33 – 10.1.220.3810.1.220.39
610.1.220.40/2910.1.220.41 – 10.1.220.4610.1.220.47
710.1.220.48/2910.1.220.49 – 10.1.220.5410.1.220.55
810.1.220.56/2910.1.220.57 – 10.1.220.6210.1.220.63
910.1.220.64/2910.1.220.65 – 10.1.220.7010.1.220.71
1010.1.220.72/2910.1.220.73 – 10.1.220.7810.1.220.79
1110.1.220.80/2910.1.220.81 – 10.1.220.8610.1.220.87
1210.1.220.88/2910.1.220.89 – 10.1.220.9410.1.220.95
1310.1.220.96/2910.1.220.97 – 10.1.220.10210.1.220.103
1410.1.220.104/2910.1.220.105 – 10.1.220.11010.1.220.111
1510.1.220.112/2910.1.220.113 – 10.1.220.11810.1.220.119
1610.1.220.120/2910.1.220.121 – 10.1.220.12610.1.220.127
1710.1.220.128/2910.1.220.129 – 10.1.220.13410.1.220.135
1810.1.220.136/2910.1.220.137 – 10.1.220.14210.1.220.143
1910.1.220.144/2910.1.220.145 – 10.1.220.15010.1.220.151
2010.1.220.152/2910.1.220.153 – 10.1.220.15810.1.220.159
2110.1.220.160/2910.1.220.161 – 10.1.220.16610.1.220.167
2210.1.220.168/2910.1.220.169 – 10.1.220.17410.1.220.175
2310.1.220.176/2910.1.220.177 – 10.1.220.18210.1.220.183
2410.1.220.184/2910.1.220.185 – 10.1.220.19010.1.220.191
2510.1.220.192/2910.1.220.193 – 10.1.220.19810.1.220.199
2610.1.220.200/2910.1.220.201 – 10.1.220.20610.1.220.207
2710.1.220.208/2910.1.220.209 – 10.1.220.21410.1.220.215
2810.1.220.216/2910.1.220.217 – 10.1.220.22210.1.220.223
2910.1.220.224/2910.1.220.225 – 10.1.220.23010.1.220.231
3010.1.220.232/2910.1.220.233 – 10.1.220.23810.1.220.239
3110.1.220.240/2910.1.220.241 – 10.1.220.24610.1.220.247
3210.1.220.248/2910.1.220.249 – 10.1.220.25410.1.220.255
3310.1.221.0/2910.1.221.1 – 10.1.221.610.1.221.7
3410.1.221.8/2910.1.221.9 – 10.1.221.1410.1.221.15
3510.1.221.16/2910.1.221.17 – 10.1.221.2210.1.221.23
3610.1.221.24/2910.1.221.25 – 10.1.221.3010.1.221.31
3710.1.221.32/2910.1.221.33 – 10.1.221.3810.1.221.39
3810.1.221.40/2910.1.221.41 – 10.1.221.4610.1.221.47
3910.1.221.48/2910.1.221.49 – 10.1.221.5410.1.221.55
4010.1.221.56/2910.1.221.57 – 10.1.221.6210.1.221.63
4110.1.221.64/2910.1.221.65 – 10.1.221.7010.1.221.71
4210.1.221.72/2910.1.221.73 – 10.1.221.7810.1.221.79
4310.1.221.80/2910.1.221.81 – 10.1.221.8610.1.221.87
4410.1.221.88/2910.1.221.89 – 10.1.221.9410.1.221.95
4510.1.221.96/2910.1.221.97 – 10.1.221.10210.1.221.103
4610.1.221.104/2910.1.221.105 – 10.1.221.11010.1.221.111
4710.1.221.112/2910.1.221.113 – 10.1.221.11810.1.221.119
4810.1.221.120/2910.1.221.121 – 10.1.221.12610.1.221.127
4910.1.221.128/2910.1.221.129 – 10.1.221.13410.1.221.135
5010.1.221.136/2910.1.221.137 – 10.1.221.14210.1.221.143
5110.1.221.144/2910.1.221.145 – 10.1.221.15010.1.221.151
5210.1.221.152/2910.1.221.153 – 10.1.221.15810.1.221.159
5310.1.221.160/2910.1.221.161 – 10.1.221.16610.1.221.167
5410.1.221.168/2910.1.221.169 – 10.1.221.17410.1.221.175
5510.1.221.176/2910.1.221.177 – 10.1.221.18210.1.221.183
5610.1.221.184/2910.1.221.185 – 10.1.221.19010.1.221.191
5710.1.221.192/2910.1.221.193 – 10.1.221.19810.1.221.199
5810.1.221.200/2910.1.221.201 – 10.1.221.20610.1.221.207
5910.1.221.208/2910.1.221.209 – 10.1.221.21410.1.221.215
6010.1.221.216/2910.1.221.217 – 10.1.221.22210.1.221.223
6110.1.221.224/2910.1.221.225 – 10.1.221.23010.1.221.231
6210.1.221.232/2910.1.221.233 – 10.1.221.23810.1.221.239
6310.1.221.240/2910.1.221.241 – 10.1.221.24610.1.221.247
6410.1.221.248/2910.1.221.249 – 10.1.221.25410.1.221.255
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 →