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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)10.112.0.0/12
network10.112.0.0/12
broadcast10.127.255.255
first host10.112.0.1
last host10.127.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.112.0.0/12
address00001010.01110000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.01110000.00000000.00000000
broadcast00001010.01111111.11111111.11111111
green = network part, grey = host part
hex0x0a700000
decimal175112192
reverse dns0.0.112.10.in-addr.arpa
ipv4-mapped::ffff:a70:0

/12 split into /18 · 64 subnets

close ×
#networkhost rangebroadcast
110.112.0.0/1810.112.0.1 – 10.112.63.25410.112.63.255
210.112.64.0/1810.112.64.1 – 10.112.127.25410.112.127.255
310.112.128.0/1810.112.128.1 – 10.112.191.25410.112.191.255
410.112.192.0/1810.112.192.1 – 10.112.255.25410.112.255.255
510.113.0.0/1810.113.0.1 – 10.113.63.25410.113.63.255
610.113.64.0/1810.113.64.1 – 10.113.127.25410.113.127.255
710.113.128.0/1810.113.128.1 – 10.113.191.25410.113.191.255
810.113.192.0/1810.113.192.1 – 10.113.255.25410.113.255.255
910.114.0.0/1810.114.0.1 – 10.114.63.25410.114.63.255
1010.114.64.0/1810.114.64.1 – 10.114.127.25410.114.127.255
1110.114.128.0/1810.114.128.1 – 10.114.191.25410.114.191.255
1210.114.192.0/1810.114.192.1 – 10.114.255.25410.114.255.255
1310.115.0.0/1810.115.0.1 – 10.115.63.25410.115.63.255
1410.115.64.0/1810.115.64.1 – 10.115.127.25410.115.127.255
1510.115.128.0/1810.115.128.1 – 10.115.191.25410.115.191.255
1610.115.192.0/1810.115.192.1 – 10.115.255.25410.115.255.255
1710.116.0.0/1810.116.0.1 – 10.116.63.25410.116.63.255
1810.116.64.0/1810.116.64.1 – 10.116.127.25410.116.127.255
1910.116.128.0/1810.116.128.1 – 10.116.191.25410.116.191.255
2010.116.192.0/1810.116.192.1 – 10.116.255.25410.116.255.255
2110.117.0.0/1810.117.0.1 – 10.117.63.25410.117.63.255
2210.117.64.0/1810.117.64.1 – 10.117.127.25410.117.127.255
2310.117.128.0/1810.117.128.1 – 10.117.191.25410.117.191.255
2410.117.192.0/1810.117.192.1 – 10.117.255.25410.117.255.255
2510.118.0.0/1810.118.0.1 – 10.118.63.25410.118.63.255
2610.118.64.0/1810.118.64.1 – 10.118.127.25410.118.127.255
2710.118.128.0/1810.118.128.1 – 10.118.191.25410.118.191.255
2810.118.192.0/1810.118.192.1 – 10.118.255.25410.118.255.255
2910.119.0.0/1810.119.0.1 – 10.119.63.25410.119.63.255
3010.119.64.0/1810.119.64.1 – 10.119.127.25410.119.127.255
3110.119.128.0/1810.119.128.1 – 10.119.191.25410.119.191.255
3210.119.192.0/1810.119.192.1 – 10.119.255.25410.119.255.255
3310.120.0.0/1810.120.0.1 – 10.120.63.25410.120.63.255
3410.120.64.0/1810.120.64.1 – 10.120.127.25410.120.127.255
3510.120.128.0/1810.120.128.1 – 10.120.191.25410.120.191.255
3610.120.192.0/1810.120.192.1 – 10.120.255.25410.120.255.255
3710.121.0.0/1810.121.0.1 – 10.121.63.25410.121.63.255
3810.121.64.0/1810.121.64.1 – 10.121.127.25410.121.127.255
3910.121.128.0/1810.121.128.1 – 10.121.191.25410.121.191.255
4010.121.192.0/1810.121.192.1 – 10.121.255.25410.121.255.255
4110.122.0.0/1810.122.0.1 – 10.122.63.25410.122.63.255
4210.122.64.0/1810.122.64.1 – 10.122.127.25410.122.127.255
4310.122.128.0/1810.122.128.1 – 10.122.191.25410.122.191.255
4410.122.192.0/1810.122.192.1 – 10.122.255.25410.122.255.255
4510.123.0.0/1810.123.0.1 – 10.123.63.25410.123.63.255
4610.123.64.0/1810.123.64.1 – 10.123.127.25410.123.127.255
4710.123.128.0/1810.123.128.1 – 10.123.191.25410.123.191.255
4810.123.192.0/1810.123.192.1 – 10.123.255.25410.123.255.255
4910.124.0.0/1810.124.0.1 – 10.124.63.25410.124.63.255
5010.124.64.0/1810.124.64.1 – 10.124.127.25410.124.127.255
5110.124.128.0/1810.124.128.1 – 10.124.191.25410.124.191.255
5210.124.192.0/1810.124.192.1 – 10.124.255.25410.124.255.255
5310.125.0.0/1810.125.0.1 – 10.125.63.25410.125.63.255
5410.125.64.0/1810.125.64.1 – 10.125.127.25410.125.127.255
5510.125.128.0/1810.125.128.1 – 10.125.191.25410.125.191.255
5610.125.192.0/1810.125.192.1 – 10.125.255.25410.125.255.255
5710.126.0.0/1810.126.0.1 – 10.126.63.25410.126.63.255
5810.126.64.0/1810.126.64.1 – 10.126.127.25410.126.127.255
5910.126.128.0/1810.126.128.1 – 10.126.191.25410.126.191.255
6010.126.192.0/1810.126.192.1 – 10.126.255.25410.126.255.255
6110.127.0.0/1810.127.0.1 – 10.127.63.25410.127.63.255
6210.127.64.0/1810.127.64.1 – 10.127.127.25410.127.127.255
6310.127.128.0/1810.127.128.1 – 10.127.191.25410.127.191.255
6410.127.192.0/1810.127.192.1 – 10.127.255.25410.127.255.255
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 →