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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)10.3.44.0/23
network10.3.44.0/23
broadcast10.3.45.255
first host10.3.44.1
last host10.3.45.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.44.0/23
address00001010.00000011.00101100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.00101100.00000000
broadcast00001010.00000011.00101101.11111111
green = network part, grey = host part
hex0x0a032c00
decimal167980032
reverse dns0.44.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:2c00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.44.0/2910.3.44.1 – 10.3.44.610.3.44.7
210.3.44.8/2910.3.44.9 – 10.3.44.1410.3.44.15
310.3.44.16/2910.3.44.17 – 10.3.44.2210.3.44.23
410.3.44.24/2910.3.44.25 – 10.3.44.3010.3.44.31
510.3.44.32/2910.3.44.33 – 10.3.44.3810.3.44.39
610.3.44.40/2910.3.44.41 – 10.3.44.4610.3.44.47
710.3.44.48/2910.3.44.49 – 10.3.44.5410.3.44.55
810.3.44.56/2910.3.44.57 – 10.3.44.6210.3.44.63
910.3.44.64/2910.3.44.65 – 10.3.44.7010.3.44.71
1010.3.44.72/2910.3.44.73 – 10.3.44.7810.3.44.79
1110.3.44.80/2910.3.44.81 – 10.3.44.8610.3.44.87
1210.3.44.88/2910.3.44.89 – 10.3.44.9410.3.44.95
1310.3.44.96/2910.3.44.97 – 10.3.44.10210.3.44.103
1410.3.44.104/2910.3.44.105 – 10.3.44.11010.3.44.111
1510.3.44.112/2910.3.44.113 – 10.3.44.11810.3.44.119
1610.3.44.120/2910.3.44.121 – 10.3.44.12610.3.44.127
1710.3.44.128/2910.3.44.129 – 10.3.44.13410.3.44.135
1810.3.44.136/2910.3.44.137 – 10.3.44.14210.3.44.143
1910.3.44.144/2910.3.44.145 – 10.3.44.15010.3.44.151
2010.3.44.152/2910.3.44.153 – 10.3.44.15810.3.44.159
2110.3.44.160/2910.3.44.161 – 10.3.44.16610.3.44.167
2210.3.44.168/2910.3.44.169 – 10.3.44.17410.3.44.175
2310.3.44.176/2910.3.44.177 – 10.3.44.18210.3.44.183
2410.3.44.184/2910.3.44.185 – 10.3.44.19010.3.44.191
2510.3.44.192/2910.3.44.193 – 10.3.44.19810.3.44.199
2610.3.44.200/2910.3.44.201 – 10.3.44.20610.3.44.207
2710.3.44.208/2910.3.44.209 – 10.3.44.21410.3.44.215
2810.3.44.216/2910.3.44.217 – 10.3.44.22210.3.44.223
2910.3.44.224/2910.3.44.225 – 10.3.44.23010.3.44.231
3010.3.44.232/2910.3.44.233 – 10.3.44.23810.3.44.239
3110.3.44.240/2910.3.44.241 – 10.3.44.24610.3.44.247
3210.3.44.248/2910.3.44.249 – 10.3.44.25410.3.44.255
3310.3.45.0/2910.3.45.1 – 10.3.45.610.3.45.7
3410.3.45.8/2910.3.45.9 – 10.3.45.1410.3.45.15
3510.3.45.16/2910.3.45.17 – 10.3.45.2210.3.45.23
3610.3.45.24/2910.3.45.25 – 10.3.45.3010.3.45.31
3710.3.45.32/2910.3.45.33 – 10.3.45.3810.3.45.39
3810.3.45.40/2910.3.45.41 – 10.3.45.4610.3.45.47
3910.3.45.48/2910.3.45.49 – 10.3.45.5410.3.45.55
4010.3.45.56/2910.3.45.57 – 10.3.45.6210.3.45.63
4110.3.45.64/2910.3.45.65 – 10.3.45.7010.3.45.71
4210.3.45.72/2910.3.45.73 – 10.3.45.7810.3.45.79
4310.3.45.80/2910.3.45.81 – 10.3.45.8610.3.45.87
4410.3.45.88/2910.3.45.89 – 10.3.45.9410.3.45.95
4510.3.45.96/2910.3.45.97 – 10.3.45.10210.3.45.103
4610.3.45.104/2910.3.45.105 – 10.3.45.11010.3.45.111
4710.3.45.112/2910.3.45.113 – 10.3.45.11810.3.45.119
4810.3.45.120/2910.3.45.121 – 10.3.45.12610.3.45.127
4910.3.45.128/2910.3.45.129 – 10.3.45.13410.3.45.135
5010.3.45.136/2910.3.45.137 – 10.3.45.14210.3.45.143
5110.3.45.144/2910.3.45.145 – 10.3.45.15010.3.45.151
5210.3.45.152/2910.3.45.153 – 10.3.45.15810.3.45.159
5310.3.45.160/2910.3.45.161 – 10.3.45.16610.3.45.167
5410.3.45.168/2910.3.45.169 – 10.3.45.17410.3.45.175
5510.3.45.176/2910.3.45.177 – 10.3.45.18210.3.45.183
5610.3.45.184/2910.3.45.185 – 10.3.45.19010.3.45.191
5710.3.45.192/2910.3.45.193 – 10.3.45.19810.3.45.199
5810.3.45.200/2910.3.45.201 – 10.3.45.20610.3.45.207
5910.3.45.208/2910.3.45.209 – 10.3.45.21410.3.45.215
6010.3.45.216/2910.3.45.217 – 10.3.45.22210.3.45.223
6110.3.45.224/2910.3.45.225 – 10.3.45.23010.3.45.231
6210.3.45.232/2910.3.45.233 – 10.3.45.23810.3.45.239
6310.3.45.240/2910.3.45.241 – 10.3.45.24610.3.45.247
6410.3.45.248/2910.3.45.249 – 10.3.45.25410.3.45.255
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 →