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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)10.3.250.0/23
network10.3.250.0/23
broadcast10.3.251.255
first host10.3.250.1
last host10.3.251.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.250.0/23
address00001010.00000011.11111010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.11111010.00000000
broadcast00001010.00000011.11111011.11111111
green = network part, grey = host part
hex0x0a03fa00
decimal168032768
reverse dns0.250.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:fa00

/23 split into /29 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.250.0/2910.3.250.1 – 10.3.250.610.3.250.7
210.3.250.8/2910.3.250.9 – 10.3.250.1410.3.250.15
310.3.250.16/2910.3.250.17 – 10.3.250.2210.3.250.23
410.3.250.24/2910.3.250.25 – 10.3.250.3010.3.250.31
510.3.250.32/2910.3.250.33 – 10.3.250.3810.3.250.39
610.3.250.40/2910.3.250.41 – 10.3.250.4610.3.250.47
710.3.250.48/2910.3.250.49 – 10.3.250.5410.3.250.55
810.3.250.56/2910.3.250.57 – 10.3.250.6210.3.250.63
910.3.250.64/2910.3.250.65 – 10.3.250.7010.3.250.71
1010.3.250.72/2910.3.250.73 – 10.3.250.7810.3.250.79
1110.3.250.80/2910.3.250.81 – 10.3.250.8610.3.250.87
1210.3.250.88/2910.3.250.89 – 10.3.250.9410.3.250.95
1310.3.250.96/2910.3.250.97 – 10.3.250.10210.3.250.103
1410.3.250.104/2910.3.250.105 – 10.3.250.11010.3.250.111
1510.3.250.112/2910.3.250.113 – 10.3.250.11810.3.250.119
1610.3.250.120/2910.3.250.121 – 10.3.250.12610.3.250.127
1710.3.250.128/2910.3.250.129 – 10.3.250.13410.3.250.135
1810.3.250.136/2910.3.250.137 – 10.3.250.14210.3.250.143
1910.3.250.144/2910.3.250.145 – 10.3.250.15010.3.250.151
2010.3.250.152/2910.3.250.153 – 10.3.250.15810.3.250.159
2110.3.250.160/2910.3.250.161 – 10.3.250.16610.3.250.167
2210.3.250.168/2910.3.250.169 – 10.3.250.17410.3.250.175
2310.3.250.176/2910.3.250.177 – 10.3.250.18210.3.250.183
2410.3.250.184/2910.3.250.185 – 10.3.250.19010.3.250.191
2510.3.250.192/2910.3.250.193 – 10.3.250.19810.3.250.199
2610.3.250.200/2910.3.250.201 – 10.3.250.20610.3.250.207
2710.3.250.208/2910.3.250.209 – 10.3.250.21410.3.250.215
2810.3.250.216/2910.3.250.217 – 10.3.250.22210.3.250.223
2910.3.250.224/2910.3.250.225 – 10.3.250.23010.3.250.231
3010.3.250.232/2910.3.250.233 – 10.3.250.23810.3.250.239
3110.3.250.240/2910.3.250.241 – 10.3.250.24610.3.250.247
3210.3.250.248/2910.3.250.249 – 10.3.250.25410.3.250.255
3310.3.251.0/2910.3.251.1 – 10.3.251.610.3.251.7
3410.3.251.8/2910.3.251.9 – 10.3.251.1410.3.251.15
3510.3.251.16/2910.3.251.17 – 10.3.251.2210.3.251.23
3610.3.251.24/2910.3.251.25 – 10.3.251.3010.3.251.31
3710.3.251.32/2910.3.251.33 – 10.3.251.3810.3.251.39
3810.3.251.40/2910.3.251.41 – 10.3.251.4610.3.251.47
3910.3.251.48/2910.3.251.49 – 10.3.251.5410.3.251.55
4010.3.251.56/2910.3.251.57 – 10.3.251.6210.3.251.63
4110.3.251.64/2910.3.251.65 – 10.3.251.7010.3.251.71
4210.3.251.72/2910.3.251.73 – 10.3.251.7810.3.251.79
4310.3.251.80/2910.3.251.81 – 10.3.251.8610.3.251.87
4410.3.251.88/2910.3.251.89 – 10.3.251.9410.3.251.95
4510.3.251.96/2910.3.251.97 – 10.3.251.10210.3.251.103
4610.3.251.104/2910.3.251.105 – 10.3.251.11010.3.251.111
4710.3.251.112/2910.3.251.113 – 10.3.251.11810.3.251.119
4810.3.251.120/2910.3.251.121 – 10.3.251.12610.3.251.127
4910.3.251.128/2910.3.251.129 – 10.3.251.13410.3.251.135
5010.3.251.136/2910.3.251.137 – 10.3.251.14210.3.251.143
5110.3.251.144/2910.3.251.145 – 10.3.251.15010.3.251.151
5210.3.251.152/2910.3.251.153 – 10.3.251.15810.3.251.159
5310.3.251.160/2910.3.251.161 – 10.3.251.16610.3.251.167
5410.3.251.168/2910.3.251.169 – 10.3.251.17410.3.251.175
5510.3.251.176/2910.3.251.177 – 10.3.251.18210.3.251.183
5610.3.251.184/2910.3.251.185 – 10.3.251.19010.3.251.191
5710.3.251.192/2910.3.251.193 – 10.3.251.19810.3.251.199
5810.3.251.200/2910.3.251.201 – 10.3.251.20610.3.251.207
5910.3.251.208/2910.3.251.209 – 10.3.251.21410.3.251.215
6010.3.251.216/2910.3.251.217 – 10.3.251.22210.3.251.223
6110.3.251.224/2910.3.251.225 – 10.3.251.23010.3.251.231
6210.3.251.232/2910.3.251.233 – 10.3.251.23810.3.251.239
6310.3.251.240/2910.3.251.241 – 10.3.251.24610.3.251.247
6410.3.251.248/2910.3.251.249 – 10.3.251.25410.3.251.255
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 →