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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)10.0.0.0/12
network10.0.0.0/12
broadcast10.15.255.255
first host10.0.0.1
last host10.15.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.0.0.0/12
address00001010.00000000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.00001111.11111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0

/12 split into /18 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.0.0/1810.0.0.1 – 10.0.63.25410.0.63.255
210.0.64.0/1810.0.64.1 – 10.0.127.25410.0.127.255
310.0.128.0/1810.0.128.1 – 10.0.191.25410.0.191.255
410.0.192.0/1810.0.192.1 – 10.0.255.25410.0.255.255
510.1.0.0/1810.1.0.1 – 10.1.63.25410.1.63.255
610.1.64.0/1810.1.64.1 – 10.1.127.25410.1.127.255
710.1.128.0/1810.1.128.1 – 10.1.191.25410.1.191.255
810.1.192.0/1810.1.192.1 – 10.1.255.25410.1.255.255
910.2.0.0/1810.2.0.1 – 10.2.63.25410.2.63.255
1010.2.64.0/1810.2.64.1 – 10.2.127.25410.2.127.255
1110.2.128.0/1810.2.128.1 – 10.2.191.25410.2.191.255
1210.2.192.0/1810.2.192.1 – 10.2.255.25410.2.255.255
1310.3.0.0/1810.3.0.1 – 10.3.63.25410.3.63.255
1410.3.64.0/1810.3.64.1 – 10.3.127.25410.3.127.255
1510.3.128.0/1810.3.128.1 – 10.3.191.25410.3.191.255
1610.3.192.0/1810.3.192.1 – 10.3.255.25410.3.255.255
1710.4.0.0/1810.4.0.1 – 10.4.63.25410.4.63.255
1810.4.64.0/1810.4.64.1 – 10.4.127.25410.4.127.255
1910.4.128.0/1810.4.128.1 – 10.4.191.25410.4.191.255
2010.4.192.0/1810.4.192.1 – 10.4.255.25410.4.255.255
2110.5.0.0/1810.5.0.1 – 10.5.63.25410.5.63.255
2210.5.64.0/1810.5.64.1 – 10.5.127.25410.5.127.255
2310.5.128.0/1810.5.128.1 – 10.5.191.25410.5.191.255
2410.5.192.0/1810.5.192.1 – 10.5.255.25410.5.255.255
2510.6.0.0/1810.6.0.1 – 10.6.63.25410.6.63.255
2610.6.64.0/1810.6.64.1 – 10.6.127.25410.6.127.255
2710.6.128.0/1810.6.128.1 – 10.6.191.25410.6.191.255
2810.6.192.0/1810.6.192.1 – 10.6.255.25410.6.255.255
2910.7.0.0/1810.7.0.1 – 10.7.63.25410.7.63.255
3010.7.64.0/1810.7.64.1 – 10.7.127.25410.7.127.255
3110.7.128.0/1810.7.128.1 – 10.7.191.25410.7.191.255
3210.7.192.0/1810.7.192.1 – 10.7.255.25410.7.255.255
3310.8.0.0/1810.8.0.1 – 10.8.63.25410.8.63.255
3410.8.64.0/1810.8.64.1 – 10.8.127.25410.8.127.255
3510.8.128.0/1810.8.128.1 – 10.8.191.25410.8.191.255
3610.8.192.0/1810.8.192.1 – 10.8.255.25410.8.255.255
3710.9.0.0/1810.9.0.1 – 10.9.63.25410.9.63.255
3810.9.64.0/1810.9.64.1 – 10.9.127.25410.9.127.255
3910.9.128.0/1810.9.128.1 – 10.9.191.25410.9.191.255
4010.9.192.0/1810.9.192.1 – 10.9.255.25410.9.255.255
4110.10.0.0/1810.10.0.1 – 10.10.63.25410.10.63.255
4210.10.64.0/1810.10.64.1 – 10.10.127.25410.10.127.255
4310.10.128.0/1810.10.128.1 – 10.10.191.25410.10.191.255
4410.10.192.0/1810.10.192.1 – 10.10.255.25410.10.255.255
4510.11.0.0/1810.11.0.1 – 10.11.63.25410.11.63.255
4610.11.64.0/1810.11.64.1 – 10.11.127.25410.11.127.255
4710.11.128.0/1810.11.128.1 – 10.11.191.25410.11.191.255
4810.11.192.0/1810.11.192.1 – 10.11.255.25410.11.255.255
4910.12.0.0/1810.12.0.1 – 10.12.63.25410.12.63.255
5010.12.64.0/1810.12.64.1 – 10.12.127.25410.12.127.255
5110.12.128.0/1810.12.128.1 – 10.12.191.25410.12.191.255
5210.12.192.0/1810.12.192.1 – 10.12.255.25410.12.255.255
5310.13.0.0/1810.13.0.1 – 10.13.63.25410.13.63.255
5410.13.64.0/1810.13.64.1 – 10.13.127.25410.13.127.255
5510.13.128.0/1810.13.128.1 – 10.13.191.25410.13.191.255
5610.13.192.0/1810.13.192.1 – 10.13.255.25410.13.255.255
5710.14.0.0/1810.14.0.1 – 10.14.63.25410.14.63.255
5810.14.64.0/1810.14.64.1 – 10.14.127.25410.14.127.255
5910.14.128.0/1810.14.128.1 – 10.14.191.25410.14.191.255
6010.14.192.0/1810.14.192.1 – 10.14.255.25410.14.255.255
6110.15.0.0/1810.15.0.1 – 10.15.63.25410.15.63.255
6210.15.64.0/1810.15.64.1 – 10.15.127.25410.15.127.255
6310.15.128.0/1810.15.128.1 – 10.15.191.25410.15.191.255
6410.15.192.0/1810.15.192.1 – 10.15.255.25410.15.255.255
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 →