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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)10.64.0.0/12
network10.64.0.0/12
broadcast10.79.255.255
first host10.64.0.1
last host10.79.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.64.0.0/12
address00001010.01000000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.01000000.00000000.00000000
broadcast00001010.01001111.11111111.11111111
green = network part, grey = host part
hex0x0a400000
decimal171966464
reverse dns0.0.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:0

/12 split into /17 · 32 subnets

close ×
#networkhost rangebroadcast
110.64.0.0/1710.64.0.1 – 10.64.127.25410.64.127.255
210.64.128.0/1710.64.128.1 – 10.64.255.25410.64.255.255
310.65.0.0/1710.65.0.1 – 10.65.127.25410.65.127.255
410.65.128.0/1710.65.128.1 – 10.65.255.25410.65.255.255
510.66.0.0/1710.66.0.1 – 10.66.127.25410.66.127.255
610.66.128.0/1710.66.128.1 – 10.66.255.25410.66.255.255
710.67.0.0/1710.67.0.1 – 10.67.127.25410.67.127.255
810.67.128.0/1710.67.128.1 – 10.67.255.25410.67.255.255
910.68.0.0/1710.68.0.1 – 10.68.127.25410.68.127.255
1010.68.128.0/1710.68.128.1 – 10.68.255.25410.68.255.255
1110.69.0.0/1710.69.0.1 – 10.69.127.25410.69.127.255
1210.69.128.0/1710.69.128.1 – 10.69.255.25410.69.255.255
1310.70.0.0/1710.70.0.1 – 10.70.127.25410.70.127.255
1410.70.128.0/1710.70.128.1 – 10.70.255.25410.70.255.255
1510.71.0.0/1710.71.0.1 – 10.71.127.25410.71.127.255
1610.71.128.0/1710.71.128.1 – 10.71.255.25410.71.255.255
1710.72.0.0/1710.72.0.1 – 10.72.127.25410.72.127.255
1810.72.128.0/1710.72.128.1 – 10.72.255.25410.72.255.255
1910.73.0.0/1710.73.0.1 – 10.73.127.25410.73.127.255
2010.73.128.0/1710.73.128.1 – 10.73.255.25410.73.255.255
2110.74.0.0/1710.74.0.1 – 10.74.127.25410.74.127.255
2210.74.128.0/1710.74.128.1 – 10.74.255.25410.74.255.255
2310.75.0.0/1710.75.0.1 – 10.75.127.25410.75.127.255
2410.75.128.0/1710.75.128.1 – 10.75.255.25410.75.255.255
2510.76.0.0/1710.76.0.1 – 10.76.127.25410.76.127.255
2610.76.128.0/1710.76.128.1 – 10.76.255.25410.76.255.255
2710.77.0.0/1710.77.0.1 – 10.77.127.25410.77.127.255
2810.77.128.0/1710.77.128.1 – 10.77.255.25410.77.255.255
2910.78.0.0/1710.78.0.1 – 10.78.127.25410.78.127.255
3010.78.128.0/1710.78.128.1 – 10.78.255.25410.78.255.255
3110.79.0.0/1710.79.0.1 – 10.79.127.25410.79.127.255
3210.79.128.0/1710.79.128.1 – 10.79.255.25410.79.255.255
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 →