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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)10.87.76.16/28
network10.87.76.16/28
broadcast10.87.76.31
first host10.87.76.17
last host10.87.76.30
subnet mask255.255.255.240
wildcard0.0.0.15
addresses16
usable hosts14
classA
ipcalc 10.87.76.16/28
address00001010.01010111.01001100.00010000
subnet mask11111111.11111111.11111111.11110000
network00001010.01010111.01001100.00010000
broadcast00001010.01010111.01001100.00011111
green = network part, grey = host part
hex0x0a574c10
decimal173493264
reverse dns16.76.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:4c10

/28 split into /32 · 16 subnets

close ×
#networkhost rangebroadcast
110.87.76.16/3210.87.76.16 – 10.87.76.1610.87.76.16
210.87.76.17/3210.87.76.17 – 10.87.76.1710.87.76.17
310.87.76.18/3210.87.76.18 – 10.87.76.1810.87.76.18
410.87.76.19/3210.87.76.19 – 10.87.76.1910.87.76.19
510.87.76.20/3210.87.76.20 – 10.87.76.2010.87.76.20
610.87.76.21/3210.87.76.21 – 10.87.76.2110.87.76.21
710.87.76.22/3210.87.76.22 – 10.87.76.2210.87.76.22
810.87.76.23/3210.87.76.23 – 10.87.76.2310.87.76.23
910.87.76.24/3210.87.76.24 – 10.87.76.2410.87.76.24
1010.87.76.25/3210.87.76.25 – 10.87.76.2510.87.76.25
1110.87.76.26/3210.87.76.26 – 10.87.76.2610.87.76.26
1210.87.76.27/3210.87.76.27 – 10.87.76.2710.87.76.27
1310.87.76.28/3210.87.76.28 – 10.87.76.2810.87.76.28
1410.87.76.29/3210.87.76.29 – 10.87.76.2910.87.76.29
1510.87.76.30/3210.87.76.30 – 10.87.76.3010.87.76.30
1610.87.76.31/3210.87.76.31 – 10.87.76.3110.87.76.31
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 →