ip
ipku.in

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)10.16.0.0/12
network10.16.0.0/12
broadcast10.31.255.255
first host10.16.0.1
last host10.31.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.16.0.0/12
address00001010.00010000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.00010000.00000000.00000000
broadcast00001010.00011111.11111111.11111111
green = network part, grey = host part
hex0x0a100000
decimal168820736
reverse dns0.0.16.10.in-addr.arpa
ipv4-mapped::ffff:a10:0

/12 split into /18 · 64 subnets

close ×
#networkhost rangebroadcast
110.16.0.0/1810.16.0.1 – 10.16.63.25410.16.63.255
210.16.64.0/1810.16.64.1 – 10.16.127.25410.16.127.255
310.16.128.0/1810.16.128.1 – 10.16.191.25410.16.191.255
410.16.192.0/1810.16.192.1 – 10.16.255.25410.16.255.255
510.17.0.0/1810.17.0.1 – 10.17.63.25410.17.63.255
610.17.64.0/1810.17.64.1 – 10.17.127.25410.17.127.255
710.17.128.0/1810.17.128.1 – 10.17.191.25410.17.191.255
810.17.192.0/1810.17.192.1 – 10.17.255.25410.17.255.255
910.18.0.0/1810.18.0.1 – 10.18.63.25410.18.63.255
1010.18.64.0/1810.18.64.1 – 10.18.127.25410.18.127.255
1110.18.128.0/1810.18.128.1 – 10.18.191.25410.18.191.255
1210.18.192.0/1810.18.192.1 – 10.18.255.25410.18.255.255
1310.19.0.0/1810.19.0.1 – 10.19.63.25410.19.63.255
1410.19.64.0/1810.19.64.1 – 10.19.127.25410.19.127.255
1510.19.128.0/1810.19.128.1 – 10.19.191.25410.19.191.255
1610.19.192.0/1810.19.192.1 – 10.19.255.25410.19.255.255
1710.20.0.0/1810.20.0.1 – 10.20.63.25410.20.63.255
1810.20.64.0/1810.20.64.1 – 10.20.127.25410.20.127.255
1910.20.128.0/1810.20.128.1 – 10.20.191.25410.20.191.255
2010.20.192.0/1810.20.192.1 – 10.20.255.25410.20.255.255
2110.21.0.0/1810.21.0.1 – 10.21.63.25410.21.63.255
2210.21.64.0/1810.21.64.1 – 10.21.127.25410.21.127.255
2310.21.128.0/1810.21.128.1 – 10.21.191.25410.21.191.255
2410.21.192.0/1810.21.192.1 – 10.21.255.25410.21.255.255
2510.22.0.0/1810.22.0.1 – 10.22.63.25410.22.63.255
2610.22.64.0/1810.22.64.1 – 10.22.127.25410.22.127.255
2710.22.128.0/1810.22.128.1 – 10.22.191.25410.22.191.255
2810.22.192.0/1810.22.192.1 – 10.22.255.25410.22.255.255
2910.23.0.0/1810.23.0.1 – 10.23.63.25410.23.63.255
3010.23.64.0/1810.23.64.1 – 10.23.127.25410.23.127.255
3110.23.128.0/1810.23.128.1 – 10.23.191.25410.23.191.255
3210.23.192.0/1810.23.192.1 – 10.23.255.25410.23.255.255
3310.24.0.0/1810.24.0.1 – 10.24.63.25410.24.63.255
3410.24.64.0/1810.24.64.1 – 10.24.127.25410.24.127.255
3510.24.128.0/1810.24.128.1 – 10.24.191.25410.24.191.255
3610.24.192.0/1810.24.192.1 – 10.24.255.25410.24.255.255
3710.25.0.0/1810.25.0.1 – 10.25.63.25410.25.63.255
3810.25.64.0/1810.25.64.1 – 10.25.127.25410.25.127.255
3910.25.128.0/1810.25.128.1 – 10.25.191.25410.25.191.255
4010.25.192.0/1810.25.192.1 – 10.25.255.25410.25.255.255
4110.26.0.0/1810.26.0.1 – 10.26.63.25410.26.63.255
4210.26.64.0/1810.26.64.1 – 10.26.127.25410.26.127.255
4310.26.128.0/1810.26.128.1 – 10.26.191.25410.26.191.255
4410.26.192.0/1810.26.192.1 – 10.26.255.25410.26.255.255
4510.27.0.0/1810.27.0.1 – 10.27.63.25410.27.63.255
4610.27.64.0/1810.27.64.1 – 10.27.127.25410.27.127.255
4710.27.128.0/1810.27.128.1 – 10.27.191.25410.27.191.255
4810.27.192.0/1810.27.192.1 – 10.27.255.25410.27.255.255
4910.28.0.0/1810.28.0.1 – 10.28.63.25410.28.63.255
5010.28.64.0/1810.28.64.1 – 10.28.127.25410.28.127.255
5110.28.128.0/1810.28.128.1 – 10.28.191.25410.28.191.255
5210.28.192.0/1810.28.192.1 – 10.28.255.25410.28.255.255
5310.29.0.0/1810.29.0.1 – 10.29.63.25410.29.63.255
5410.29.64.0/1810.29.64.1 – 10.29.127.25410.29.127.255
5510.29.128.0/1810.29.128.1 – 10.29.191.25410.29.191.255
5610.29.192.0/1810.29.192.1 – 10.29.255.25410.29.255.255
5710.30.0.0/1810.30.0.1 – 10.30.63.25410.30.63.255
5810.30.64.0/1810.30.64.1 – 10.30.127.25410.30.127.255
5910.30.128.0/1810.30.128.1 – 10.30.191.25410.30.191.255
6010.30.192.0/1810.30.192.1 – 10.30.255.25410.30.255.255
6110.31.0.0/1810.31.0.1 – 10.31.63.25410.31.63.255
6210.31.64.0/1810.31.64.1 – 10.31.127.25410.31.127.255
6310.31.128.0/1810.31.128.1 – 10.31.191.25410.31.191.255
6410.31.192.0/1810.31.192.1 – 10.31.255.25410.31.255.255
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 →