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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)10.0.180.0/23
network10.0.180.0/23
broadcast10.0.181.255
first host10.0.180.1
last host10.0.181.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.180.0/23
address00001010.00000000.10110100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.10110100.00000000
broadcast00001010.00000000.10110101.11111111
green = network part, grey = host part
hex0x0a00b400
decimal167818240
reverse dns0.180.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:b400

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.180.0/2910.0.180.1 – 10.0.180.610.0.180.7
210.0.180.8/2910.0.180.9 – 10.0.180.1410.0.180.15
310.0.180.16/2910.0.180.17 – 10.0.180.2210.0.180.23
410.0.180.24/2910.0.180.25 – 10.0.180.3010.0.180.31
510.0.180.32/2910.0.180.33 – 10.0.180.3810.0.180.39
610.0.180.40/2910.0.180.41 – 10.0.180.4610.0.180.47
710.0.180.48/2910.0.180.49 – 10.0.180.5410.0.180.55
810.0.180.56/2910.0.180.57 – 10.0.180.6210.0.180.63
910.0.180.64/2910.0.180.65 – 10.0.180.7010.0.180.71
1010.0.180.72/2910.0.180.73 – 10.0.180.7810.0.180.79
1110.0.180.80/2910.0.180.81 – 10.0.180.8610.0.180.87
1210.0.180.88/2910.0.180.89 – 10.0.180.9410.0.180.95
1310.0.180.96/2910.0.180.97 – 10.0.180.10210.0.180.103
1410.0.180.104/2910.0.180.105 – 10.0.180.11010.0.180.111
1510.0.180.112/2910.0.180.113 – 10.0.180.11810.0.180.119
1610.0.180.120/2910.0.180.121 – 10.0.180.12610.0.180.127
1710.0.180.128/2910.0.180.129 – 10.0.180.13410.0.180.135
1810.0.180.136/2910.0.180.137 – 10.0.180.14210.0.180.143
1910.0.180.144/2910.0.180.145 – 10.0.180.15010.0.180.151
2010.0.180.152/2910.0.180.153 – 10.0.180.15810.0.180.159
2110.0.180.160/2910.0.180.161 – 10.0.180.16610.0.180.167
2210.0.180.168/2910.0.180.169 – 10.0.180.17410.0.180.175
2310.0.180.176/2910.0.180.177 – 10.0.180.18210.0.180.183
2410.0.180.184/2910.0.180.185 – 10.0.180.19010.0.180.191
2510.0.180.192/2910.0.180.193 – 10.0.180.19810.0.180.199
2610.0.180.200/2910.0.180.201 – 10.0.180.20610.0.180.207
2710.0.180.208/2910.0.180.209 – 10.0.180.21410.0.180.215
2810.0.180.216/2910.0.180.217 – 10.0.180.22210.0.180.223
2910.0.180.224/2910.0.180.225 – 10.0.180.23010.0.180.231
3010.0.180.232/2910.0.180.233 – 10.0.180.23810.0.180.239
3110.0.180.240/2910.0.180.241 – 10.0.180.24610.0.180.247
3210.0.180.248/2910.0.180.249 – 10.0.180.25410.0.180.255
3310.0.181.0/2910.0.181.1 – 10.0.181.610.0.181.7
3410.0.181.8/2910.0.181.9 – 10.0.181.1410.0.181.15
3510.0.181.16/2910.0.181.17 – 10.0.181.2210.0.181.23
3610.0.181.24/2910.0.181.25 – 10.0.181.3010.0.181.31
3710.0.181.32/2910.0.181.33 – 10.0.181.3810.0.181.39
3810.0.181.40/2910.0.181.41 – 10.0.181.4610.0.181.47
3910.0.181.48/2910.0.181.49 – 10.0.181.5410.0.181.55
4010.0.181.56/2910.0.181.57 – 10.0.181.6210.0.181.63
4110.0.181.64/2910.0.181.65 – 10.0.181.7010.0.181.71
4210.0.181.72/2910.0.181.73 – 10.0.181.7810.0.181.79
4310.0.181.80/2910.0.181.81 – 10.0.181.8610.0.181.87
4410.0.181.88/2910.0.181.89 – 10.0.181.9410.0.181.95
4510.0.181.96/2910.0.181.97 – 10.0.181.10210.0.181.103
4610.0.181.104/2910.0.181.105 – 10.0.181.11010.0.181.111
4710.0.181.112/2910.0.181.113 – 10.0.181.11810.0.181.119
4810.0.181.120/2910.0.181.121 – 10.0.181.12610.0.181.127
4910.0.181.128/2910.0.181.129 – 10.0.181.13410.0.181.135
5010.0.181.136/2910.0.181.137 – 10.0.181.14210.0.181.143
5110.0.181.144/2910.0.181.145 – 10.0.181.15010.0.181.151
5210.0.181.152/2910.0.181.153 – 10.0.181.15810.0.181.159
5310.0.181.160/2910.0.181.161 – 10.0.181.16610.0.181.167
5410.0.181.168/2910.0.181.169 – 10.0.181.17410.0.181.175
5510.0.181.176/2910.0.181.177 – 10.0.181.18210.0.181.183
5610.0.181.184/2910.0.181.185 – 10.0.181.19010.0.181.191
5710.0.181.192/2910.0.181.193 – 10.0.181.19810.0.181.199
5810.0.181.200/2910.0.181.201 – 10.0.181.20610.0.181.207
5910.0.181.208/2910.0.181.209 – 10.0.181.21410.0.181.215
6010.0.181.216/2910.0.181.217 – 10.0.181.22210.0.181.223
6110.0.181.224/2910.0.181.225 – 10.0.181.23010.0.181.231
6210.0.181.232/2910.0.181.233 – 10.0.181.23810.0.181.239
6310.0.181.240/2910.0.181.241 – 10.0.181.24610.0.181.247
6410.0.181.248/2910.0.181.249 – 10.0.181.25410.0.181.255
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 →