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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)10.32.0.0/12
network10.32.0.0/12
broadcast10.47.255.255
first host10.32.0.1
last host10.47.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.32.0.0/12
address00001010.00100000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.00100000.00000000.00000000
broadcast00001010.00101111.11111111.11111111
green = network part, grey = host part
hex0x0a200000
decimal169869312
reverse dns0.0.32.10.in-addr.arpa
ipv4-mapped::ffff:a20:0

/12 split into /17 · 32 subnets

close ×
#networkhost rangebroadcast
110.32.0.0/1710.32.0.1 – 10.32.127.25410.32.127.255
210.32.128.0/1710.32.128.1 – 10.32.255.25410.32.255.255
310.33.0.0/1710.33.0.1 – 10.33.127.25410.33.127.255
410.33.128.0/1710.33.128.1 – 10.33.255.25410.33.255.255
510.34.0.0/1710.34.0.1 – 10.34.127.25410.34.127.255
610.34.128.0/1710.34.128.1 – 10.34.255.25410.34.255.255
710.35.0.0/1710.35.0.1 – 10.35.127.25410.35.127.255
810.35.128.0/1710.35.128.1 – 10.35.255.25410.35.255.255
910.36.0.0/1710.36.0.1 – 10.36.127.25410.36.127.255
1010.36.128.0/1710.36.128.1 – 10.36.255.25410.36.255.255
1110.37.0.0/1710.37.0.1 – 10.37.127.25410.37.127.255
1210.37.128.0/1710.37.128.1 – 10.37.255.25410.37.255.255
1310.38.0.0/1710.38.0.1 – 10.38.127.25410.38.127.255
1410.38.128.0/1710.38.128.1 – 10.38.255.25410.38.255.255
1510.39.0.0/1710.39.0.1 – 10.39.127.25410.39.127.255
1610.39.128.0/1710.39.128.1 – 10.39.255.25410.39.255.255
1710.40.0.0/1710.40.0.1 – 10.40.127.25410.40.127.255
1810.40.128.0/1710.40.128.1 – 10.40.255.25410.40.255.255
1910.41.0.0/1710.41.0.1 – 10.41.127.25410.41.127.255
2010.41.128.0/1710.41.128.1 – 10.41.255.25410.41.255.255
2110.42.0.0/1710.42.0.1 – 10.42.127.25410.42.127.255
2210.42.128.0/1710.42.128.1 – 10.42.255.25410.42.255.255
2310.43.0.0/1710.43.0.1 – 10.43.127.25410.43.127.255
2410.43.128.0/1710.43.128.1 – 10.43.255.25410.43.255.255
2510.44.0.0/1710.44.0.1 – 10.44.127.25410.44.127.255
2610.44.128.0/1710.44.128.1 – 10.44.255.25410.44.255.255
2710.45.0.0/1710.45.0.1 – 10.45.127.25410.45.127.255
2810.45.128.0/1710.45.128.1 – 10.45.255.25410.45.255.255
2910.46.0.0/1710.46.0.1 – 10.46.127.25410.46.127.255
3010.46.128.0/1710.46.128.1 – 10.46.255.25410.46.255.255
3110.47.0.0/1710.47.0.1 – 10.47.127.25410.47.127.255
3210.47.128.0/1710.47.128.1 – 10.47.255.25410.47.255.255
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 →