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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)10.86.0.0/15
network10.86.0.0/15
broadcast10.87.255.255
first host10.86.0.1
last host10.87.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.86.0.0/15
address00001010.01010110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01010110.00000000.00000000
broadcast00001010.01010111.11111111.11111111
green = network part, grey = host part
hex0x0a560000
decimal173408256
reverse dns0.0.86.10.in-addr.arpa
ipv4-mapped::ffff:a56:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.86.0.0/2110.86.0.1 – 10.86.7.25410.86.7.255
210.86.8.0/2110.86.8.1 – 10.86.15.25410.86.15.255
310.86.16.0/2110.86.16.1 – 10.86.23.25410.86.23.255
410.86.24.0/2110.86.24.1 – 10.86.31.25410.86.31.255
510.86.32.0/2110.86.32.1 – 10.86.39.25410.86.39.255
610.86.40.0/2110.86.40.1 – 10.86.47.25410.86.47.255
710.86.48.0/2110.86.48.1 – 10.86.55.25410.86.55.255
810.86.56.0/2110.86.56.1 – 10.86.63.25410.86.63.255
910.86.64.0/2110.86.64.1 – 10.86.71.25410.86.71.255
1010.86.72.0/2110.86.72.1 – 10.86.79.25410.86.79.255
1110.86.80.0/2110.86.80.1 – 10.86.87.25410.86.87.255
1210.86.88.0/2110.86.88.1 – 10.86.95.25410.86.95.255
1310.86.96.0/2110.86.96.1 – 10.86.103.25410.86.103.255
1410.86.104.0/2110.86.104.1 – 10.86.111.25410.86.111.255
1510.86.112.0/2110.86.112.1 – 10.86.119.25410.86.119.255
1610.86.120.0/2110.86.120.1 – 10.86.127.25410.86.127.255
1710.86.128.0/2110.86.128.1 – 10.86.135.25410.86.135.255
1810.86.136.0/2110.86.136.1 – 10.86.143.25410.86.143.255
1910.86.144.0/2110.86.144.1 – 10.86.151.25410.86.151.255
2010.86.152.0/2110.86.152.1 – 10.86.159.25410.86.159.255
2110.86.160.0/2110.86.160.1 – 10.86.167.25410.86.167.255
2210.86.168.0/2110.86.168.1 – 10.86.175.25410.86.175.255
2310.86.176.0/2110.86.176.1 – 10.86.183.25410.86.183.255
2410.86.184.0/2110.86.184.1 – 10.86.191.25410.86.191.255
2510.86.192.0/2110.86.192.1 – 10.86.199.25410.86.199.255
2610.86.200.0/2110.86.200.1 – 10.86.207.25410.86.207.255
2710.86.208.0/2110.86.208.1 – 10.86.215.25410.86.215.255
2810.86.216.0/2110.86.216.1 – 10.86.223.25410.86.223.255
2910.86.224.0/2110.86.224.1 – 10.86.231.25410.86.231.255
3010.86.232.0/2110.86.232.1 – 10.86.239.25410.86.239.255
3110.86.240.0/2110.86.240.1 – 10.86.247.25410.86.247.255
3210.86.248.0/2110.86.248.1 – 10.86.255.25410.86.255.255
3310.87.0.0/2110.87.0.1 – 10.87.7.25410.87.7.255
3410.87.8.0/2110.87.8.1 – 10.87.15.25410.87.15.255
3510.87.16.0/2110.87.16.1 – 10.87.23.25410.87.23.255
3610.87.24.0/2110.87.24.1 – 10.87.31.25410.87.31.255
3710.87.32.0/2110.87.32.1 – 10.87.39.25410.87.39.255
3810.87.40.0/2110.87.40.1 – 10.87.47.25410.87.47.255
3910.87.48.0/2110.87.48.1 – 10.87.55.25410.87.55.255
4010.87.56.0/2110.87.56.1 – 10.87.63.25410.87.63.255
4110.87.64.0/2110.87.64.1 – 10.87.71.25410.87.71.255
4210.87.72.0/2110.87.72.1 – 10.87.79.25410.87.79.255
4310.87.80.0/2110.87.80.1 – 10.87.87.25410.87.87.255
4410.87.88.0/2110.87.88.1 – 10.87.95.25410.87.95.255
4510.87.96.0/2110.87.96.1 – 10.87.103.25410.87.103.255
4610.87.104.0/2110.87.104.1 – 10.87.111.25410.87.111.255
4710.87.112.0/2110.87.112.1 – 10.87.119.25410.87.119.255
4810.87.120.0/2110.87.120.1 – 10.87.127.25410.87.127.255
4910.87.128.0/2110.87.128.1 – 10.87.135.25410.87.135.255
5010.87.136.0/2110.87.136.1 – 10.87.143.25410.87.143.255
5110.87.144.0/2110.87.144.1 – 10.87.151.25410.87.151.255
5210.87.152.0/2110.87.152.1 – 10.87.159.25410.87.159.255
5310.87.160.0/2110.87.160.1 – 10.87.167.25410.87.167.255
5410.87.168.0/2110.87.168.1 – 10.87.175.25410.87.175.255
5510.87.176.0/2110.87.176.1 – 10.87.183.25410.87.183.255
5610.87.184.0/2110.87.184.1 – 10.87.191.25410.87.191.255
5710.87.192.0/2110.87.192.1 – 10.87.199.25410.87.199.255
5810.87.200.0/2110.87.200.1 – 10.87.207.25410.87.207.255
5910.87.208.0/2110.87.208.1 – 10.87.215.25410.87.215.255
6010.87.216.0/2110.87.216.1 – 10.87.223.25410.87.223.255
6110.87.224.0/2110.87.224.1 – 10.87.231.25410.87.231.255
6210.87.232.0/2110.87.232.1 – 10.87.239.25410.87.239.255
6310.87.240.0/2110.87.240.1 – 10.87.247.25410.87.247.255
6410.87.248.0/2110.87.248.1 – 10.87.255.25410.87.255.255
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 →