ip
ipku.in

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)10.2.151.16/28
network10.2.151.16/28
broadcast10.2.151.31
first host10.2.151.17
last host10.2.151.30
subnet mask255.255.255.240
wildcard0.0.0.15
addresses16
usable hosts14
classA
ipcalc 10.2.151.16/28
address00001010.00000010.10010111.00010000
subnet mask11111111.11111111.11111111.11110000
network00001010.00000010.10010111.00010000
broadcast00001010.00000010.10010111.00011111
green = network part, grey = host part
hex0x0a029710
decimal167941904
reverse dns16.151.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:9710

/28 split into /32 · 16 subnets

close ×
#networkhost rangebroadcast
110.2.151.16/3210.2.151.16 – 10.2.151.1610.2.151.16
210.2.151.17/3210.2.151.17 – 10.2.151.1710.2.151.17
310.2.151.18/3210.2.151.18 – 10.2.151.1810.2.151.18
410.2.151.19/3210.2.151.19 – 10.2.151.1910.2.151.19
510.2.151.20/3210.2.151.20 – 10.2.151.2010.2.151.20
610.2.151.21/3210.2.151.21 – 10.2.151.2110.2.151.21
710.2.151.22/3210.2.151.22 – 10.2.151.2210.2.151.22
810.2.151.23/3210.2.151.23 – 10.2.151.2310.2.151.23
910.2.151.24/3210.2.151.24 – 10.2.151.2410.2.151.24
1010.2.151.25/3210.2.151.25 – 10.2.151.2510.2.151.25
1110.2.151.26/3210.2.151.26 – 10.2.151.2610.2.151.26
1210.2.151.27/3210.2.151.27 – 10.2.151.2710.2.151.27
1310.2.151.28/3210.2.151.28 – 10.2.151.2810.2.151.28
1410.2.151.29/3210.2.151.29 – 10.2.151.2910.2.151.29
1510.2.151.30/3210.2.151.30 – 10.2.151.3010.2.151.30
1610.2.151.31/3210.2.151.31 – 10.2.151.3110.2.151.31
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 →