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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)10.240.0.0/12
network10.240.0.0/12
broadcast10.255.255.255
first host10.240.0.1
last host10.255.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.240.0.0/12
address00001010.11110000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.11110000.00000000.00000000
broadcast00001010.11111111.11111111.11111111
green = network part, grey = host part
hex0x0af00000
decimal183500800
reverse dns0.0.240.10.in-addr.arpa
ipv4-mapped::ffff:af0:0

/12 split into /18 · 64 subnets

close ×
#networkhost rangebroadcast
110.240.0.0/1810.240.0.1 – 10.240.63.25410.240.63.255
210.240.64.0/1810.240.64.1 – 10.240.127.25410.240.127.255
310.240.128.0/1810.240.128.1 – 10.240.191.25410.240.191.255
410.240.192.0/1810.240.192.1 – 10.240.255.25410.240.255.255
510.241.0.0/1810.241.0.1 – 10.241.63.25410.241.63.255
610.241.64.0/1810.241.64.1 – 10.241.127.25410.241.127.255
710.241.128.0/1810.241.128.1 – 10.241.191.25410.241.191.255
810.241.192.0/1810.241.192.1 – 10.241.255.25410.241.255.255
910.242.0.0/1810.242.0.1 – 10.242.63.25410.242.63.255
1010.242.64.0/1810.242.64.1 – 10.242.127.25410.242.127.255
1110.242.128.0/1810.242.128.1 – 10.242.191.25410.242.191.255
1210.242.192.0/1810.242.192.1 – 10.242.255.25410.242.255.255
1310.243.0.0/1810.243.0.1 – 10.243.63.25410.243.63.255
1410.243.64.0/1810.243.64.1 – 10.243.127.25410.243.127.255
1510.243.128.0/1810.243.128.1 – 10.243.191.25410.243.191.255
1610.243.192.0/1810.243.192.1 – 10.243.255.25410.243.255.255
1710.244.0.0/1810.244.0.1 – 10.244.63.25410.244.63.255
1810.244.64.0/1810.244.64.1 – 10.244.127.25410.244.127.255
1910.244.128.0/1810.244.128.1 – 10.244.191.25410.244.191.255
2010.244.192.0/1810.244.192.1 – 10.244.255.25410.244.255.255
2110.245.0.0/1810.245.0.1 – 10.245.63.25410.245.63.255
2210.245.64.0/1810.245.64.1 – 10.245.127.25410.245.127.255
2310.245.128.0/1810.245.128.1 – 10.245.191.25410.245.191.255
2410.245.192.0/1810.245.192.1 – 10.245.255.25410.245.255.255
2510.246.0.0/1810.246.0.1 – 10.246.63.25410.246.63.255
2610.246.64.0/1810.246.64.1 – 10.246.127.25410.246.127.255
2710.246.128.0/1810.246.128.1 – 10.246.191.25410.246.191.255
2810.246.192.0/1810.246.192.1 – 10.246.255.25410.246.255.255
2910.247.0.0/1810.247.0.1 – 10.247.63.25410.247.63.255
3010.247.64.0/1810.247.64.1 – 10.247.127.25410.247.127.255
3110.247.128.0/1810.247.128.1 – 10.247.191.25410.247.191.255
3210.247.192.0/1810.247.192.1 – 10.247.255.25410.247.255.255
3310.248.0.0/1810.248.0.1 – 10.248.63.25410.248.63.255
3410.248.64.0/1810.248.64.1 – 10.248.127.25410.248.127.255
3510.248.128.0/1810.248.128.1 – 10.248.191.25410.248.191.255
3610.248.192.0/1810.248.192.1 – 10.248.255.25410.248.255.255
3710.249.0.0/1810.249.0.1 – 10.249.63.25410.249.63.255
3810.249.64.0/1810.249.64.1 – 10.249.127.25410.249.127.255
3910.249.128.0/1810.249.128.1 – 10.249.191.25410.249.191.255
4010.249.192.0/1810.249.192.1 – 10.249.255.25410.249.255.255
4110.250.0.0/1810.250.0.1 – 10.250.63.25410.250.63.255
4210.250.64.0/1810.250.64.1 – 10.250.127.25410.250.127.255
4310.250.128.0/1810.250.128.1 – 10.250.191.25410.250.191.255
4410.250.192.0/1810.250.192.1 – 10.250.255.25410.250.255.255
4510.251.0.0/1810.251.0.1 – 10.251.63.25410.251.63.255
4610.251.64.0/1810.251.64.1 – 10.251.127.25410.251.127.255
4710.251.128.0/1810.251.128.1 – 10.251.191.25410.251.191.255
4810.251.192.0/1810.251.192.1 – 10.251.255.25410.251.255.255
4910.252.0.0/1810.252.0.1 – 10.252.63.25410.252.63.255
5010.252.64.0/1810.252.64.1 – 10.252.127.25410.252.127.255
5110.252.128.0/1810.252.128.1 – 10.252.191.25410.252.191.255
5210.252.192.0/1810.252.192.1 – 10.252.255.25410.252.255.255
5310.253.0.0/1810.253.0.1 – 10.253.63.25410.253.63.255
5410.253.64.0/1810.253.64.1 – 10.253.127.25410.253.127.255
5510.253.128.0/1810.253.128.1 – 10.253.191.25410.253.191.255
5610.253.192.0/1810.253.192.1 – 10.253.255.25410.253.255.255
5710.254.0.0/1810.254.0.1 – 10.254.63.25410.254.63.255
5810.254.64.0/1810.254.64.1 – 10.254.127.25410.254.127.255
5910.254.128.0/1810.254.128.1 – 10.254.191.25410.254.191.255
6010.254.192.0/1810.254.192.1 – 10.254.255.25410.254.255.255
6110.255.0.0/1810.255.0.1 – 10.255.63.25410.255.63.255
6210.255.64.0/1810.255.64.1 – 10.255.127.25410.255.127.255
6310.255.128.0/1810.255.128.1 – 10.255.191.25410.255.191.255
6410.255.192.0/1810.255.192.1 – 10.255.255.25410.255.255.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /12
/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-
/12255.240.0.01,048,5761,048,5741
/13255.248.0.0524,288524,2862 split →
/14255.252.0.0262,144262,1424 split →
/15255.254.0.0131,072131,0708 split →
/16255.255.0.065,53665,53416 split →
/17255.255.128.032,76832,76632 split →
/18255.255.192.016,38416,38264 split →
/19255.255.224.08,1928,190128 split →
/20255.255.240.04,0964,094256 split →
/21255.255.248.02,0482,046512 split →
/22255.255.252.01,0241,0221,024 split →
/23255.255.254.05125102,048 split →
/24255.255.255.02562544,096 split →
/25255.255.255.1281281268,192 split →
/26255.255.255.192646216,384 split →
/27255.255.255.224323032,768 split →
/28255.255.255.240161465,536 split →
/29255.255.255.24886131,072 split →
/30255.255.255.25242262,144 split →
/31255.255.255.25422524,288 split →
/32255.255.255.255111,048,576 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 →