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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)10.3.166.64/28
network10.3.166.64/28
broadcast10.3.166.79
first host10.3.166.65
last host10.3.166.78
subnet mask255.255.255.240
wildcard0.0.0.15
addresses16
usable hosts14
classA
ipcalc 10.3.166.64/28
address00001010.00000011.10100110.01000000
subnet mask11111111.11111111.11111111.11110000
network00001010.00000011.10100110.01000000
broadcast00001010.00000011.10100110.01001111
green = network part, grey = host part
hex0x0a03a640
decimal168011328
reverse dns64.166.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:a640

/28 split into /32 · 16 subnets

close ×
#networkhost rangebroadcast
110.3.166.64/3210.3.166.64 – 10.3.166.6410.3.166.64
210.3.166.65/3210.3.166.65 – 10.3.166.6510.3.166.65
310.3.166.66/3210.3.166.66 – 10.3.166.6610.3.166.66
410.3.166.67/3210.3.166.67 – 10.3.166.6710.3.166.67
510.3.166.68/3210.3.166.68 – 10.3.166.6810.3.166.68
610.3.166.69/3210.3.166.69 – 10.3.166.6910.3.166.69
710.3.166.70/3210.3.166.70 – 10.3.166.7010.3.166.70
810.3.166.71/3210.3.166.71 – 10.3.166.7110.3.166.71
910.3.166.72/3210.3.166.72 – 10.3.166.7210.3.166.72
1010.3.166.73/3210.3.166.73 – 10.3.166.7310.3.166.73
1110.3.166.74/3210.3.166.74 – 10.3.166.7410.3.166.74
1210.3.166.75/3210.3.166.75 – 10.3.166.7510.3.166.75
1310.3.166.76/3210.3.166.76 – 10.3.166.7610.3.166.76
1410.3.166.77/3210.3.166.77 – 10.3.166.7710.3.166.77
1510.3.166.78/3210.3.166.78 – 10.3.166.7810.3.166.78
1610.3.166.79/3210.3.166.79 – 10.3.166.7910.3.166.79
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /28
/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-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.1926462-
/27255.255.255.2243230-
/28255.255.255.24016141
/29255.255.255.248862 split →
/30255.255.255.252424 split →
/31255.255.255.254228 split →
/32255.255.255.2551116 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 →