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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)10.2.218.0/23
network10.2.218.0/23
broadcast10.2.219.255
first host10.2.218.1
last host10.2.219.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.218.0/23
address00001010.00000010.11011010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.11011010.00000000
broadcast00001010.00000010.11011011.11111111
green = network part, grey = host part
hex0x0a02da00
decimal167959040
reverse dns0.218.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:da00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.218.0/2910.2.218.1 – 10.2.218.610.2.218.7
210.2.218.8/2910.2.218.9 – 10.2.218.1410.2.218.15
310.2.218.16/2910.2.218.17 – 10.2.218.2210.2.218.23
410.2.218.24/2910.2.218.25 – 10.2.218.3010.2.218.31
510.2.218.32/2910.2.218.33 – 10.2.218.3810.2.218.39
610.2.218.40/2910.2.218.41 – 10.2.218.4610.2.218.47
710.2.218.48/2910.2.218.49 – 10.2.218.5410.2.218.55
810.2.218.56/2910.2.218.57 – 10.2.218.6210.2.218.63
910.2.218.64/2910.2.218.65 – 10.2.218.7010.2.218.71
1010.2.218.72/2910.2.218.73 – 10.2.218.7810.2.218.79
1110.2.218.80/2910.2.218.81 – 10.2.218.8610.2.218.87
1210.2.218.88/2910.2.218.89 – 10.2.218.9410.2.218.95
1310.2.218.96/2910.2.218.97 – 10.2.218.10210.2.218.103
1410.2.218.104/2910.2.218.105 – 10.2.218.11010.2.218.111
1510.2.218.112/2910.2.218.113 – 10.2.218.11810.2.218.119
1610.2.218.120/2910.2.218.121 – 10.2.218.12610.2.218.127
1710.2.218.128/2910.2.218.129 – 10.2.218.13410.2.218.135
1810.2.218.136/2910.2.218.137 – 10.2.218.14210.2.218.143
1910.2.218.144/2910.2.218.145 – 10.2.218.15010.2.218.151
2010.2.218.152/2910.2.218.153 – 10.2.218.15810.2.218.159
2110.2.218.160/2910.2.218.161 – 10.2.218.16610.2.218.167
2210.2.218.168/2910.2.218.169 – 10.2.218.17410.2.218.175
2310.2.218.176/2910.2.218.177 – 10.2.218.18210.2.218.183
2410.2.218.184/2910.2.218.185 – 10.2.218.19010.2.218.191
2510.2.218.192/2910.2.218.193 – 10.2.218.19810.2.218.199
2610.2.218.200/2910.2.218.201 – 10.2.218.20610.2.218.207
2710.2.218.208/2910.2.218.209 – 10.2.218.21410.2.218.215
2810.2.218.216/2910.2.218.217 – 10.2.218.22210.2.218.223
2910.2.218.224/2910.2.218.225 – 10.2.218.23010.2.218.231
3010.2.218.232/2910.2.218.233 – 10.2.218.23810.2.218.239
3110.2.218.240/2910.2.218.241 – 10.2.218.24610.2.218.247
3210.2.218.248/2910.2.218.249 – 10.2.218.25410.2.218.255
3310.2.219.0/2910.2.219.1 – 10.2.219.610.2.219.7
3410.2.219.8/2910.2.219.9 – 10.2.219.1410.2.219.15
3510.2.219.16/2910.2.219.17 – 10.2.219.2210.2.219.23
3610.2.219.24/2910.2.219.25 – 10.2.219.3010.2.219.31
3710.2.219.32/2910.2.219.33 – 10.2.219.3810.2.219.39
3810.2.219.40/2910.2.219.41 – 10.2.219.4610.2.219.47
3910.2.219.48/2910.2.219.49 – 10.2.219.5410.2.219.55
4010.2.219.56/2910.2.219.57 – 10.2.219.6210.2.219.63
4110.2.219.64/2910.2.219.65 – 10.2.219.7010.2.219.71
4210.2.219.72/2910.2.219.73 – 10.2.219.7810.2.219.79
4310.2.219.80/2910.2.219.81 – 10.2.219.8610.2.219.87
4410.2.219.88/2910.2.219.89 – 10.2.219.9410.2.219.95
4510.2.219.96/2910.2.219.97 – 10.2.219.10210.2.219.103
4610.2.219.104/2910.2.219.105 – 10.2.219.11010.2.219.111
4710.2.219.112/2910.2.219.113 – 10.2.219.11810.2.219.119
4810.2.219.120/2910.2.219.121 – 10.2.219.12610.2.219.127
4910.2.219.128/2910.2.219.129 – 10.2.219.13410.2.219.135
5010.2.219.136/2910.2.219.137 – 10.2.219.14210.2.219.143
5110.2.219.144/2910.2.219.145 – 10.2.219.15010.2.219.151
5210.2.219.152/2910.2.219.153 – 10.2.219.15810.2.219.159
5310.2.219.160/2910.2.219.161 – 10.2.219.16610.2.219.167
5410.2.219.168/2910.2.219.169 – 10.2.219.17410.2.219.175
5510.2.219.176/2910.2.219.177 – 10.2.219.18210.2.219.183
5610.2.219.184/2910.2.219.185 – 10.2.219.19010.2.219.191
5710.2.219.192/2910.2.219.193 – 10.2.219.19810.2.219.199
5810.2.219.200/2910.2.219.201 – 10.2.219.20610.2.219.207
5910.2.219.208/2910.2.219.209 – 10.2.219.21410.2.219.215
6010.2.219.216/2910.2.219.217 – 10.2.219.22210.2.219.223
6110.2.219.224/2910.2.219.225 – 10.2.219.23010.2.219.231
6210.2.219.232/2910.2.219.233 – 10.2.219.23810.2.219.239
6310.2.219.240/2910.2.219.241 – 10.2.219.24610.2.219.247
6410.2.219.248/2910.2.219.249 – 10.2.219.25410.2.219.255
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 →