ip
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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)10.132.0.0/15
network10.132.0.0/15
broadcast10.133.255.255
first host10.132.0.1
last host10.133.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.132.0.0/15
address00001010.10000100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10000100.00000000.00000000
broadcast00001010.10000101.11111111.11111111
green = network part, grey = host part
hex0x0a840000
decimal176422912
reverse dns0.0.132.10.in-addr.arpa
ipv4-mapped::ffff:a84:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.132.0.0/2110.132.0.1 – 10.132.7.25410.132.7.255
210.132.8.0/2110.132.8.1 – 10.132.15.25410.132.15.255
310.132.16.0/2110.132.16.1 – 10.132.23.25410.132.23.255
410.132.24.0/2110.132.24.1 – 10.132.31.25410.132.31.255
510.132.32.0/2110.132.32.1 – 10.132.39.25410.132.39.255
610.132.40.0/2110.132.40.1 – 10.132.47.25410.132.47.255
710.132.48.0/2110.132.48.1 – 10.132.55.25410.132.55.255
810.132.56.0/2110.132.56.1 – 10.132.63.25410.132.63.255
910.132.64.0/2110.132.64.1 – 10.132.71.25410.132.71.255
1010.132.72.0/2110.132.72.1 – 10.132.79.25410.132.79.255
1110.132.80.0/2110.132.80.1 – 10.132.87.25410.132.87.255
1210.132.88.0/2110.132.88.1 – 10.132.95.25410.132.95.255
1310.132.96.0/2110.132.96.1 – 10.132.103.25410.132.103.255
1410.132.104.0/2110.132.104.1 – 10.132.111.25410.132.111.255
1510.132.112.0/2110.132.112.1 – 10.132.119.25410.132.119.255
1610.132.120.0/2110.132.120.1 – 10.132.127.25410.132.127.255
1710.132.128.0/2110.132.128.1 – 10.132.135.25410.132.135.255
1810.132.136.0/2110.132.136.1 – 10.132.143.25410.132.143.255
1910.132.144.0/2110.132.144.1 – 10.132.151.25410.132.151.255
2010.132.152.0/2110.132.152.1 – 10.132.159.25410.132.159.255
2110.132.160.0/2110.132.160.1 – 10.132.167.25410.132.167.255
2210.132.168.0/2110.132.168.1 – 10.132.175.25410.132.175.255
2310.132.176.0/2110.132.176.1 – 10.132.183.25410.132.183.255
2410.132.184.0/2110.132.184.1 – 10.132.191.25410.132.191.255
2510.132.192.0/2110.132.192.1 – 10.132.199.25410.132.199.255
2610.132.200.0/2110.132.200.1 – 10.132.207.25410.132.207.255
2710.132.208.0/2110.132.208.1 – 10.132.215.25410.132.215.255
2810.132.216.0/2110.132.216.1 – 10.132.223.25410.132.223.255
2910.132.224.0/2110.132.224.1 – 10.132.231.25410.132.231.255
3010.132.232.0/2110.132.232.1 – 10.132.239.25410.132.239.255
3110.132.240.0/2110.132.240.1 – 10.132.247.25410.132.247.255
3210.132.248.0/2110.132.248.1 – 10.132.255.25410.132.255.255
3310.133.0.0/2110.133.0.1 – 10.133.7.25410.133.7.255
3410.133.8.0/2110.133.8.1 – 10.133.15.25410.133.15.255
3510.133.16.0/2110.133.16.1 – 10.133.23.25410.133.23.255
3610.133.24.0/2110.133.24.1 – 10.133.31.25410.133.31.255
3710.133.32.0/2110.133.32.1 – 10.133.39.25410.133.39.255
3810.133.40.0/2110.133.40.1 – 10.133.47.25410.133.47.255
3910.133.48.0/2110.133.48.1 – 10.133.55.25410.133.55.255
4010.133.56.0/2110.133.56.1 – 10.133.63.25410.133.63.255
4110.133.64.0/2110.133.64.1 – 10.133.71.25410.133.71.255
4210.133.72.0/2110.133.72.1 – 10.133.79.25410.133.79.255
4310.133.80.0/2110.133.80.1 – 10.133.87.25410.133.87.255
4410.133.88.0/2110.133.88.1 – 10.133.95.25410.133.95.255
4510.133.96.0/2110.133.96.1 – 10.133.103.25410.133.103.255
4610.133.104.0/2110.133.104.1 – 10.133.111.25410.133.111.255
4710.133.112.0/2110.133.112.1 – 10.133.119.25410.133.119.255
4810.133.120.0/2110.133.120.1 – 10.133.127.25410.133.127.255
4910.133.128.0/2110.133.128.1 – 10.133.135.25410.133.135.255
5010.133.136.0/2110.133.136.1 – 10.133.143.25410.133.143.255
5110.133.144.0/2110.133.144.1 – 10.133.151.25410.133.151.255
5210.133.152.0/2110.133.152.1 – 10.133.159.25410.133.159.255
5310.133.160.0/2110.133.160.1 – 10.133.167.25410.133.167.255
5410.133.168.0/2110.133.168.1 – 10.133.175.25410.133.175.255
5510.133.176.0/2110.133.176.1 – 10.133.183.25410.133.183.255
5610.133.184.0/2110.133.184.1 – 10.133.191.25410.133.191.255
5710.133.192.0/2110.133.192.1 – 10.133.199.25410.133.199.255
5810.133.200.0/2110.133.200.1 – 10.133.207.25410.133.207.255
5910.133.208.0/2110.133.208.1 – 10.133.215.25410.133.215.255
6010.133.216.0/2110.133.216.1 – 10.133.223.25410.133.223.255
6110.133.224.0/2110.133.224.1 – 10.133.231.25410.133.231.255
6210.133.232.0/2110.133.232.1 – 10.133.239.25410.133.239.255
6310.133.240.0/2110.133.240.1 – 10.133.247.25410.133.247.255
6410.133.248.0/2110.133.248.1 – 10.133.255.25410.133.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /15
/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-
/15255.254.0.0131,072131,0701
/16255.255.0.065,53665,5342 split →
/17255.255.128.032,76832,7664 split →
/18255.255.192.016,38416,3828 split →
/19255.255.224.08,1928,19016 split →
/20255.255.240.04,0964,09432 split →
/21255.255.248.02,0482,04664 split →
/22255.255.252.01,0241,022128 split →
/23255.255.254.0512510256 split →
/24255.255.255.0256254512 split →
/25255.255.255.1281281261,024 split →
/26255.255.255.19264622,048 split →
/27255.255.255.22432304,096 split →
/28255.255.255.24016148,192 split →
/29255.255.255.2488616,384 split →
/30255.255.255.2524232,768 split →
/31255.255.255.2542265,536 split →
/32255.255.255.25511131,072 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 →