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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)10.84.8.0/23
network10.84.8.0/23
broadcast10.84.9.255
first host10.84.8.1
last host10.84.9.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.84.8.0/23
address00001010.01010100.00001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01010100.00001000.00000000
broadcast00001010.01010100.00001001.11111111
green = network part, grey = host part
hex0x0a540800
decimal173279232
reverse dns0.8.84.10.in-addr.arpa
ipv4-mapped::ffff:a54:800

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.84.8.0/2910.84.8.1 – 10.84.8.610.84.8.7
210.84.8.8/2910.84.8.9 – 10.84.8.1410.84.8.15
310.84.8.16/2910.84.8.17 – 10.84.8.2210.84.8.23
410.84.8.24/2910.84.8.25 – 10.84.8.3010.84.8.31
510.84.8.32/2910.84.8.33 – 10.84.8.3810.84.8.39
610.84.8.40/2910.84.8.41 – 10.84.8.4610.84.8.47
710.84.8.48/2910.84.8.49 – 10.84.8.5410.84.8.55
810.84.8.56/2910.84.8.57 – 10.84.8.6210.84.8.63
910.84.8.64/2910.84.8.65 – 10.84.8.7010.84.8.71
1010.84.8.72/2910.84.8.73 – 10.84.8.7810.84.8.79
1110.84.8.80/2910.84.8.81 – 10.84.8.8610.84.8.87
1210.84.8.88/2910.84.8.89 – 10.84.8.9410.84.8.95
1310.84.8.96/2910.84.8.97 – 10.84.8.10210.84.8.103
1410.84.8.104/2910.84.8.105 – 10.84.8.11010.84.8.111
1510.84.8.112/2910.84.8.113 – 10.84.8.11810.84.8.119
1610.84.8.120/2910.84.8.121 – 10.84.8.12610.84.8.127
1710.84.8.128/2910.84.8.129 – 10.84.8.13410.84.8.135
1810.84.8.136/2910.84.8.137 – 10.84.8.14210.84.8.143
1910.84.8.144/2910.84.8.145 – 10.84.8.15010.84.8.151
2010.84.8.152/2910.84.8.153 – 10.84.8.15810.84.8.159
2110.84.8.160/2910.84.8.161 – 10.84.8.16610.84.8.167
2210.84.8.168/2910.84.8.169 – 10.84.8.17410.84.8.175
2310.84.8.176/2910.84.8.177 – 10.84.8.18210.84.8.183
2410.84.8.184/2910.84.8.185 – 10.84.8.19010.84.8.191
2510.84.8.192/2910.84.8.193 – 10.84.8.19810.84.8.199
2610.84.8.200/2910.84.8.201 – 10.84.8.20610.84.8.207
2710.84.8.208/2910.84.8.209 – 10.84.8.21410.84.8.215
2810.84.8.216/2910.84.8.217 – 10.84.8.22210.84.8.223
2910.84.8.224/2910.84.8.225 – 10.84.8.23010.84.8.231
3010.84.8.232/2910.84.8.233 – 10.84.8.23810.84.8.239
3110.84.8.240/2910.84.8.241 – 10.84.8.24610.84.8.247
3210.84.8.248/2910.84.8.249 – 10.84.8.25410.84.8.255
3310.84.9.0/2910.84.9.1 – 10.84.9.610.84.9.7
3410.84.9.8/2910.84.9.9 – 10.84.9.1410.84.9.15
3510.84.9.16/2910.84.9.17 – 10.84.9.2210.84.9.23
3610.84.9.24/2910.84.9.25 – 10.84.9.3010.84.9.31
3710.84.9.32/2910.84.9.33 – 10.84.9.3810.84.9.39
3810.84.9.40/2910.84.9.41 – 10.84.9.4610.84.9.47
3910.84.9.48/2910.84.9.49 – 10.84.9.5410.84.9.55
4010.84.9.56/2910.84.9.57 – 10.84.9.6210.84.9.63
4110.84.9.64/2910.84.9.65 – 10.84.9.7010.84.9.71
4210.84.9.72/2910.84.9.73 – 10.84.9.7810.84.9.79
4310.84.9.80/2910.84.9.81 – 10.84.9.8610.84.9.87
4410.84.9.88/2910.84.9.89 – 10.84.9.9410.84.9.95
4510.84.9.96/2910.84.9.97 – 10.84.9.10210.84.9.103
4610.84.9.104/2910.84.9.105 – 10.84.9.11010.84.9.111
4710.84.9.112/2910.84.9.113 – 10.84.9.11810.84.9.119
4810.84.9.120/2910.84.9.121 – 10.84.9.12610.84.9.127
4910.84.9.128/2910.84.9.129 – 10.84.9.13410.84.9.135
5010.84.9.136/2910.84.9.137 – 10.84.9.14210.84.9.143
5110.84.9.144/2910.84.9.145 – 10.84.9.15010.84.9.151
5210.84.9.152/2910.84.9.153 – 10.84.9.15810.84.9.159
5310.84.9.160/2910.84.9.161 – 10.84.9.16610.84.9.167
5410.84.9.168/2910.84.9.169 – 10.84.9.17410.84.9.175
5510.84.9.176/2910.84.9.177 – 10.84.9.18210.84.9.183
5610.84.9.184/2910.84.9.185 – 10.84.9.19010.84.9.191
5710.84.9.192/2910.84.9.193 – 10.84.9.19810.84.9.199
5810.84.9.200/2910.84.9.201 – 10.84.9.20610.84.9.207
5910.84.9.208/2910.84.9.209 – 10.84.9.21410.84.9.215
6010.84.9.216/2910.84.9.217 – 10.84.9.22210.84.9.223
6110.84.9.224/2910.84.9.225 – 10.84.9.23010.84.9.231
6210.84.9.232/2910.84.9.233 – 10.84.9.23810.84.9.239
6310.84.9.240/2910.84.9.241 – 10.84.9.24610.84.9.247
6410.84.9.248/2910.84.9.249 – 10.84.9.25410.84.9.255
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 →