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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)10.0.254.0/23
network10.0.254.0/23
broadcast10.0.255.255
first host10.0.254.1
last host10.0.255.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.254.0/23
address00001010.00000000.11111110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.11111110.00000000
broadcast00001010.00000000.11111111.11111111
green = network part, grey = host part
hex0x0a00fe00
decimal167837184
reverse dns0.254.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:fe00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.254.0/2910.0.254.1 – 10.0.254.610.0.254.7
210.0.254.8/2910.0.254.9 – 10.0.254.1410.0.254.15
310.0.254.16/2910.0.254.17 – 10.0.254.2210.0.254.23
410.0.254.24/2910.0.254.25 – 10.0.254.3010.0.254.31
510.0.254.32/2910.0.254.33 – 10.0.254.3810.0.254.39
610.0.254.40/2910.0.254.41 – 10.0.254.4610.0.254.47
710.0.254.48/2910.0.254.49 – 10.0.254.5410.0.254.55
810.0.254.56/2910.0.254.57 – 10.0.254.6210.0.254.63
910.0.254.64/2910.0.254.65 – 10.0.254.7010.0.254.71
1010.0.254.72/2910.0.254.73 – 10.0.254.7810.0.254.79
1110.0.254.80/2910.0.254.81 – 10.0.254.8610.0.254.87
1210.0.254.88/2910.0.254.89 – 10.0.254.9410.0.254.95
1310.0.254.96/2910.0.254.97 – 10.0.254.10210.0.254.103
1410.0.254.104/2910.0.254.105 – 10.0.254.11010.0.254.111
1510.0.254.112/2910.0.254.113 – 10.0.254.11810.0.254.119
1610.0.254.120/2910.0.254.121 – 10.0.254.12610.0.254.127
1710.0.254.128/2910.0.254.129 – 10.0.254.13410.0.254.135
1810.0.254.136/2910.0.254.137 – 10.0.254.14210.0.254.143
1910.0.254.144/2910.0.254.145 – 10.0.254.15010.0.254.151
2010.0.254.152/2910.0.254.153 – 10.0.254.15810.0.254.159
2110.0.254.160/2910.0.254.161 – 10.0.254.16610.0.254.167
2210.0.254.168/2910.0.254.169 – 10.0.254.17410.0.254.175
2310.0.254.176/2910.0.254.177 – 10.0.254.18210.0.254.183
2410.0.254.184/2910.0.254.185 – 10.0.254.19010.0.254.191
2510.0.254.192/2910.0.254.193 – 10.0.254.19810.0.254.199
2610.0.254.200/2910.0.254.201 – 10.0.254.20610.0.254.207
2710.0.254.208/2910.0.254.209 – 10.0.254.21410.0.254.215
2810.0.254.216/2910.0.254.217 – 10.0.254.22210.0.254.223
2910.0.254.224/2910.0.254.225 – 10.0.254.23010.0.254.231
3010.0.254.232/2910.0.254.233 – 10.0.254.23810.0.254.239
3110.0.254.240/2910.0.254.241 – 10.0.254.24610.0.254.247
3210.0.254.248/2910.0.254.249 – 10.0.254.25410.0.254.255
3310.0.255.0/2910.0.255.1 – 10.0.255.610.0.255.7
3410.0.255.8/2910.0.255.9 – 10.0.255.1410.0.255.15
3510.0.255.16/2910.0.255.17 – 10.0.255.2210.0.255.23
3610.0.255.24/2910.0.255.25 – 10.0.255.3010.0.255.31
3710.0.255.32/2910.0.255.33 – 10.0.255.3810.0.255.39
3810.0.255.40/2910.0.255.41 – 10.0.255.4610.0.255.47
3910.0.255.48/2910.0.255.49 – 10.0.255.5410.0.255.55
4010.0.255.56/2910.0.255.57 – 10.0.255.6210.0.255.63
4110.0.255.64/2910.0.255.65 – 10.0.255.7010.0.255.71
4210.0.255.72/2910.0.255.73 – 10.0.255.7810.0.255.79
4310.0.255.80/2910.0.255.81 – 10.0.255.8610.0.255.87
4410.0.255.88/2910.0.255.89 – 10.0.255.9410.0.255.95
4510.0.255.96/2910.0.255.97 – 10.0.255.10210.0.255.103
4610.0.255.104/2910.0.255.105 – 10.0.255.11010.0.255.111
4710.0.255.112/2910.0.255.113 – 10.0.255.11810.0.255.119
4810.0.255.120/2910.0.255.121 – 10.0.255.12610.0.255.127
4910.0.255.128/2910.0.255.129 – 10.0.255.13410.0.255.135
5010.0.255.136/2910.0.255.137 – 10.0.255.14210.0.255.143
5110.0.255.144/2910.0.255.145 – 10.0.255.15010.0.255.151
5210.0.255.152/2910.0.255.153 – 10.0.255.15810.0.255.159
5310.0.255.160/2910.0.255.161 – 10.0.255.16610.0.255.167
5410.0.255.168/2910.0.255.169 – 10.0.255.17410.0.255.175
5510.0.255.176/2910.0.255.177 – 10.0.255.18210.0.255.183
5610.0.255.184/2910.0.255.185 – 10.0.255.19010.0.255.191
5710.0.255.192/2910.0.255.193 – 10.0.255.19810.0.255.199
5810.0.255.200/2910.0.255.201 – 10.0.255.20610.0.255.207
5910.0.255.208/2910.0.255.209 – 10.0.255.21410.0.255.215
6010.0.255.216/2910.0.255.217 – 10.0.255.22210.0.255.223
6110.0.255.224/2910.0.255.225 – 10.0.255.23010.0.255.231
6210.0.255.232/2910.0.255.233 – 10.0.255.23810.0.255.239
6310.0.255.240/2910.0.255.241 – 10.0.255.24610.0.255.247
6410.0.255.248/2910.0.255.249 – 10.0.255.25410.0.255.255
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 →