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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)10.6.178.0/23
network10.6.178.0/23
broadcast10.6.179.255
first host10.6.178.1
last host10.6.179.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.6.178.0/23
address00001010.00000110.10110010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000110.10110010.00000000
broadcast00001010.00000110.10110011.11111111
green = network part, grey = host part
hex0x0a06b200
decimal168210944
reverse dns0.178.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:b200

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.6.178.0/2910.6.178.1 – 10.6.178.610.6.178.7
210.6.178.8/2910.6.178.9 – 10.6.178.1410.6.178.15
310.6.178.16/2910.6.178.17 – 10.6.178.2210.6.178.23
410.6.178.24/2910.6.178.25 – 10.6.178.3010.6.178.31
510.6.178.32/2910.6.178.33 – 10.6.178.3810.6.178.39
610.6.178.40/2910.6.178.41 – 10.6.178.4610.6.178.47
710.6.178.48/2910.6.178.49 – 10.6.178.5410.6.178.55
810.6.178.56/2910.6.178.57 – 10.6.178.6210.6.178.63
910.6.178.64/2910.6.178.65 – 10.6.178.7010.6.178.71
1010.6.178.72/2910.6.178.73 – 10.6.178.7810.6.178.79
1110.6.178.80/2910.6.178.81 – 10.6.178.8610.6.178.87
1210.6.178.88/2910.6.178.89 – 10.6.178.9410.6.178.95
1310.6.178.96/2910.6.178.97 – 10.6.178.10210.6.178.103
1410.6.178.104/2910.6.178.105 – 10.6.178.11010.6.178.111
1510.6.178.112/2910.6.178.113 – 10.6.178.11810.6.178.119
1610.6.178.120/2910.6.178.121 – 10.6.178.12610.6.178.127
1710.6.178.128/2910.6.178.129 – 10.6.178.13410.6.178.135
1810.6.178.136/2910.6.178.137 – 10.6.178.14210.6.178.143
1910.6.178.144/2910.6.178.145 – 10.6.178.15010.6.178.151
2010.6.178.152/2910.6.178.153 – 10.6.178.15810.6.178.159
2110.6.178.160/2910.6.178.161 – 10.6.178.16610.6.178.167
2210.6.178.168/2910.6.178.169 – 10.6.178.17410.6.178.175
2310.6.178.176/2910.6.178.177 – 10.6.178.18210.6.178.183
2410.6.178.184/2910.6.178.185 – 10.6.178.19010.6.178.191
2510.6.178.192/2910.6.178.193 – 10.6.178.19810.6.178.199
2610.6.178.200/2910.6.178.201 – 10.6.178.20610.6.178.207
2710.6.178.208/2910.6.178.209 – 10.6.178.21410.6.178.215
2810.6.178.216/2910.6.178.217 – 10.6.178.22210.6.178.223
2910.6.178.224/2910.6.178.225 – 10.6.178.23010.6.178.231
3010.6.178.232/2910.6.178.233 – 10.6.178.23810.6.178.239
3110.6.178.240/2910.6.178.241 – 10.6.178.24610.6.178.247
3210.6.178.248/2910.6.178.249 – 10.6.178.25410.6.178.255
3310.6.179.0/2910.6.179.1 – 10.6.179.610.6.179.7
3410.6.179.8/2910.6.179.9 – 10.6.179.1410.6.179.15
3510.6.179.16/2910.6.179.17 – 10.6.179.2210.6.179.23
3610.6.179.24/2910.6.179.25 – 10.6.179.3010.6.179.31
3710.6.179.32/2910.6.179.33 – 10.6.179.3810.6.179.39
3810.6.179.40/2910.6.179.41 – 10.6.179.4610.6.179.47
3910.6.179.48/2910.6.179.49 – 10.6.179.5410.6.179.55
4010.6.179.56/2910.6.179.57 – 10.6.179.6210.6.179.63
4110.6.179.64/2910.6.179.65 – 10.6.179.7010.6.179.71
4210.6.179.72/2910.6.179.73 – 10.6.179.7810.6.179.79
4310.6.179.80/2910.6.179.81 – 10.6.179.8610.6.179.87
4410.6.179.88/2910.6.179.89 – 10.6.179.9410.6.179.95
4510.6.179.96/2910.6.179.97 – 10.6.179.10210.6.179.103
4610.6.179.104/2910.6.179.105 – 10.6.179.11010.6.179.111
4710.6.179.112/2910.6.179.113 – 10.6.179.11810.6.179.119
4810.6.179.120/2910.6.179.121 – 10.6.179.12610.6.179.127
4910.6.179.128/2910.6.179.129 – 10.6.179.13410.6.179.135
5010.6.179.136/2910.6.179.137 – 10.6.179.14210.6.179.143
5110.6.179.144/2910.6.179.145 – 10.6.179.15010.6.179.151
5210.6.179.152/2910.6.179.153 – 10.6.179.15810.6.179.159
5310.6.179.160/2910.6.179.161 – 10.6.179.16610.6.179.167
5410.6.179.168/2910.6.179.169 – 10.6.179.17410.6.179.175
5510.6.179.176/2910.6.179.177 – 10.6.179.18210.6.179.183
5610.6.179.184/2910.6.179.185 – 10.6.179.19010.6.179.191
5710.6.179.192/2910.6.179.193 – 10.6.179.19810.6.179.199
5810.6.179.200/2910.6.179.201 – 10.6.179.20610.6.179.207
5910.6.179.208/2910.6.179.209 – 10.6.179.21410.6.179.215
6010.6.179.216/2910.6.179.217 – 10.6.179.22210.6.179.223
6110.6.179.224/2910.6.179.225 – 10.6.179.23010.6.179.231
6210.6.179.232/2910.6.179.233 – 10.6.179.23810.6.179.239
6310.6.179.240/2910.6.179.241 – 10.6.179.24610.6.179.247
6410.6.179.248/2910.6.179.249 – 10.6.179.25410.6.179.255
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 →