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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)10.184.0.0/15
network10.184.0.0/15
broadcast10.185.255.255
first host10.184.0.1
last host10.185.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.184.0.0/15
address00001010.10111000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10111000.00000000.00000000
broadcast00001010.10111001.11111111.11111111
green = network part, grey = host part
hex0x0ab80000
decimal179830784
reverse dns0.0.184.10.in-addr.arpa
ipv4-mapped::ffff:ab8:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.184.0.0/2110.184.0.1 – 10.184.7.25410.184.7.255
210.184.8.0/2110.184.8.1 – 10.184.15.25410.184.15.255
310.184.16.0/2110.184.16.1 – 10.184.23.25410.184.23.255
410.184.24.0/2110.184.24.1 – 10.184.31.25410.184.31.255
510.184.32.0/2110.184.32.1 – 10.184.39.25410.184.39.255
610.184.40.0/2110.184.40.1 – 10.184.47.25410.184.47.255
710.184.48.0/2110.184.48.1 – 10.184.55.25410.184.55.255
810.184.56.0/2110.184.56.1 – 10.184.63.25410.184.63.255
910.184.64.0/2110.184.64.1 – 10.184.71.25410.184.71.255
1010.184.72.0/2110.184.72.1 – 10.184.79.25410.184.79.255
1110.184.80.0/2110.184.80.1 – 10.184.87.25410.184.87.255
1210.184.88.0/2110.184.88.1 – 10.184.95.25410.184.95.255
1310.184.96.0/2110.184.96.1 – 10.184.103.25410.184.103.255
1410.184.104.0/2110.184.104.1 – 10.184.111.25410.184.111.255
1510.184.112.0/2110.184.112.1 – 10.184.119.25410.184.119.255
1610.184.120.0/2110.184.120.1 – 10.184.127.25410.184.127.255
1710.184.128.0/2110.184.128.1 – 10.184.135.25410.184.135.255
1810.184.136.0/2110.184.136.1 – 10.184.143.25410.184.143.255
1910.184.144.0/2110.184.144.1 – 10.184.151.25410.184.151.255
2010.184.152.0/2110.184.152.1 – 10.184.159.25410.184.159.255
2110.184.160.0/2110.184.160.1 – 10.184.167.25410.184.167.255
2210.184.168.0/2110.184.168.1 – 10.184.175.25410.184.175.255
2310.184.176.0/2110.184.176.1 – 10.184.183.25410.184.183.255
2410.184.184.0/2110.184.184.1 – 10.184.191.25410.184.191.255
2510.184.192.0/2110.184.192.1 – 10.184.199.25410.184.199.255
2610.184.200.0/2110.184.200.1 – 10.184.207.25410.184.207.255
2710.184.208.0/2110.184.208.1 – 10.184.215.25410.184.215.255
2810.184.216.0/2110.184.216.1 – 10.184.223.25410.184.223.255
2910.184.224.0/2110.184.224.1 – 10.184.231.25410.184.231.255
3010.184.232.0/2110.184.232.1 – 10.184.239.25410.184.239.255
3110.184.240.0/2110.184.240.1 – 10.184.247.25410.184.247.255
3210.184.248.0/2110.184.248.1 – 10.184.255.25410.184.255.255
3310.185.0.0/2110.185.0.1 – 10.185.7.25410.185.7.255
3410.185.8.0/2110.185.8.1 – 10.185.15.25410.185.15.255
3510.185.16.0/2110.185.16.1 – 10.185.23.25410.185.23.255
3610.185.24.0/2110.185.24.1 – 10.185.31.25410.185.31.255
3710.185.32.0/2110.185.32.1 – 10.185.39.25410.185.39.255
3810.185.40.0/2110.185.40.1 – 10.185.47.25410.185.47.255
3910.185.48.0/2110.185.48.1 – 10.185.55.25410.185.55.255
4010.185.56.0/2110.185.56.1 – 10.185.63.25410.185.63.255
4110.185.64.0/2110.185.64.1 – 10.185.71.25410.185.71.255
4210.185.72.0/2110.185.72.1 – 10.185.79.25410.185.79.255
4310.185.80.0/2110.185.80.1 – 10.185.87.25410.185.87.255
4410.185.88.0/2110.185.88.1 – 10.185.95.25410.185.95.255
4510.185.96.0/2110.185.96.1 – 10.185.103.25410.185.103.255
4610.185.104.0/2110.185.104.1 – 10.185.111.25410.185.111.255
4710.185.112.0/2110.185.112.1 – 10.185.119.25410.185.119.255
4810.185.120.0/2110.185.120.1 – 10.185.127.25410.185.127.255
4910.185.128.0/2110.185.128.1 – 10.185.135.25410.185.135.255
5010.185.136.0/2110.185.136.1 – 10.185.143.25410.185.143.255
5110.185.144.0/2110.185.144.1 – 10.185.151.25410.185.151.255
5210.185.152.0/2110.185.152.1 – 10.185.159.25410.185.159.255
5310.185.160.0/2110.185.160.1 – 10.185.167.25410.185.167.255
5410.185.168.0/2110.185.168.1 – 10.185.175.25410.185.175.255
5510.185.176.0/2110.185.176.1 – 10.185.183.25410.185.183.255
5610.185.184.0/2110.185.184.1 – 10.185.191.25410.185.191.255
5710.185.192.0/2110.185.192.1 – 10.185.199.25410.185.199.255
5810.185.200.0/2110.185.200.1 – 10.185.207.25410.185.207.255
5910.185.208.0/2110.185.208.1 – 10.185.215.25410.185.215.255
6010.185.216.0/2110.185.216.1 – 10.185.223.25410.185.223.255
6110.185.224.0/2110.185.224.1 – 10.185.231.25410.185.231.255
6210.185.232.0/2110.185.232.1 – 10.185.239.25410.185.239.255
6310.185.240.0/2110.185.240.1 – 10.185.247.25410.185.247.255
6410.185.248.0/2110.185.248.1 – 10.185.255.25410.185.255.255
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 →