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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)10.3.210.0/23
network10.3.210.0/23
broadcast10.3.211.255
first host10.3.210.1
last host10.3.211.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.210.0/23
address00001010.00000011.11010010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.11010010.00000000
broadcast00001010.00000011.11010011.11111111
green = network part, grey = host part
hex0x0a03d200
decimal168022528
reverse dns0.210.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:d200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.210.0/2910.3.210.1 – 10.3.210.610.3.210.7
210.3.210.8/2910.3.210.9 – 10.3.210.1410.3.210.15
310.3.210.16/2910.3.210.17 – 10.3.210.2210.3.210.23
410.3.210.24/2910.3.210.25 – 10.3.210.3010.3.210.31
510.3.210.32/2910.3.210.33 – 10.3.210.3810.3.210.39
610.3.210.40/2910.3.210.41 – 10.3.210.4610.3.210.47
710.3.210.48/2910.3.210.49 – 10.3.210.5410.3.210.55
810.3.210.56/2910.3.210.57 – 10.3.210.6210.3.210.63
910.3.210.64/2910.3.210.65 – 10.3.210.7010.3.210.71
1010.3.210.72/2910.3.210.73 – 10.3.210.7810.3.210.79
1110.3.210.80/2910.3.210.81 – 10.3.210.8610.3.210.87
1210.3.210.88/2910.3.210.89 – 10.3.210.9410.3.210.95
1310.3.210.96/2910.3.210.97 – 10.3.210.10210.3.210.103
1410.3.210.104/2910.3.210.105 – 10.3.210.11010.3.210.111
1510.3.210.112/2910.3.210.113 – 10.3.210.11810.3.210.119
1610.3.210.120/2910.3.210.121 – 10.3.210.12610.3.210.127
1710.3.210.128/2910.3.210.129 – 10.3.210.13410.3.210.135
1810.3.210.136/2910.3.210.137 – 10.3.210.14210.3.210.143
1910.3.210.144/2910.3.210.145 – 10.3.210.15010.3.210.151
2010.3.210.152/2910.3.210.153 – 10.3.210.15810.3.210.159
2110.3.210.160/2910.3.210.161 – 10.3.210.16610.3.210.167
2210.3.210.168/2910.3.210.169 – 10.3.210.17410.3.210.175
2310.3.210.176/2910.3.210.177 – 10.3.210.18210.3.210.183
2410.3.210.184/2910.3.210.185 – 10.3.210.19010.3.210.191
2510.3.210.192/2910.3.210.193 – 10.3.210.19810.3.210.199
2610.3.210.200/2910.3.210.201 – 10.3.210.20610.3.210.207
2710.3.210.208/2910.3.210.209 – 10.3.210.21410.3.210.215
2810.3.210.216/2910.3.210.217 – 10.3.210.22210.3.210.223
2910.3.210.224/2910.3.210.225 – 10.3.210.23010.3.210.231
3010.3.210.232/2910.3.210.233 – 10.3.210.23810.3.210.239
3110.3.210.240/2910.3.210.241 – 10.3.210.24610.3.210.247
3210.3.210.248/2910.3.210.249 – 10.3.210.25410.3.210.255
3310.3.211.0/2910.3.211.1 – 10.3.211.610.3.211.7
3410.3.211.8/2910.3.211.9 – 10.3.211.1410.3.211.15
3510.3.211.16/2910.3.211.17 – 10.3.211.2210.3.211.23
3610.3.211.24/2910.3.211.25 – 10.3.211.3010.3.211.31
3710.3.211.32/2910.3.211.33 – 10.3.211.3810.3.211.39
3810.3.211.40/2910.3.211.41 – 10.3.211.4610.3.211.47
3910.3.211.48/2910.3.211.49 – 10.3.211.5410.3.211.55
4010.3.211.56/2910.3.211.57 – 10.3.211.6210.3.211.63
4110.3.211.64/2910.3.211.65 – 10.3.211.7010.3.211.71
4210.3.211.72/2910.3.211.73 – 10.3.211.7810.3.211.79
4310.3.211.80/2910.3.211.81 – 10.3.211.8610.3.211.87
4410.3.211.88/2910.3.211.89 – 10.3.211.9410.3.211.95
4510.3.211.96/2910.3.211.97 – 10.3.211.10210.3.211.103
4610.3.211.104/2910.3.211.105 – 10.3.211.11010.3.211.111
4710.3.211.112/2910.3.211.113 – 10.3.211.11810.3.211.119
4810.3.211.120/2910.3.211.121 – 10.3.211.12610.3.211.127
4910.3.211.128/2910.3.211.129 – 10.3.211.13410.3.211.135
5010.3.211.136/2910.3.211.137 – 10.3.211.14210.3.211.143
5110.3.211.144/2910.3.211.145 – 10.3.211.15010.3.211.151
5210.3.211.152/2910.3.211.153 – 10.3.211.15810.3.211.159
5310.3.211.160/2910.3.211.161 – 10.3.211.16610.3.211.167
5410.3.211.168/2910.3.211.169 – 10.3.211.17410.3.211.175
5510.3.211.176/2910.3.211.177 – 10.3.211.18210.3.211.183
5610.3.211.184/2910.3.211.185 – 10.3.211.19010.3.211.191
5710.3.211.192/2910.3.211.193 – 10.3.211.19810.3.211.199
5810.3.211.200/2910.3.211.201 – 10.3.211.20610.3.211.207
5910.3.211.208/2910.3.211.209 – 10.3.211.21410.3.211.215
6010.3.211.216/2910.3.211.217 – 10.3.211.22210.3.211.223
6110.3.211.224/2910.3.211.225 – 10.3.211.23010.3.211.231
6210.3.211.232/2910.3.211.233 – 10.3.211.23810.3.211.239
6310.3.211.240/2910.3.211.241 – 10.3.211.24610.3.211.247
6410.3.211.248/2910.3.211.249 – 10.3.211.25410.3.211.255
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 →