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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)10.242.0.0/15
network10.242.0.0/15
broadcast10.243.255.255
first host10.242.0.1
last host10.243.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.242.0.0/15
address00001010.11110010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11110010.00000000.00000000
broadcast00001010.11110011.11111111.11111111
green = network part, grey = host part
hex0x0af20000
decimal183631872
reverse dns0.0.242.10.in-addr.arpa
ipv4-mapped::ffff:af2:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.242.0.0/2110.242.0.1 – 10.242.7.25410.242.7.255
210.242.8.0/2110.242.8.1 – 10.242.15.25410.242.15.255
310.242.16.0/2110.242.16.1 – 10.242.23.25410.242.23.255
410.242.24.0/2110.242.24.1 – 10.242.31.25410.242.31.255
510.242.32.0/2110.242.32.1 – 10.242.39.25410.242.39.255
610.242.40.0/2110.242.40.1 – 10.242.47.25410.242.47.255
710.242.48.0/2110.242.48.1 – 10.242.55.25410.242.55.255
810.242.56.0/2110.242.56.1 – 10.242.63.25410.242.63.255
910.242.64.0/2110.242.64.1 – 10.242.71.25410.242.71.255
1010.242.72.0/2110.242.72.1 – 10.242.79.25410.242.79.255
1110.242.80.0/2110.242.80.1 – 10.242.87.25410.242.87.255
1210.242.88.0/2110.242.88.1 – 10.242.95.25410.242.95.255
1310.242.96.0/2110.242.96.1 – 10.242.103.25410.242.103.255
1410.242.104.0/2110.242.104.1 – 10.242.111.25410.242.111.255
1510.242.112.0/2110.242.112.1 – 10.242.119.25410.242.119.255
1610.242.120.0/2110.242.120.1 – 10.242.127.25410.242.127.255
1710.242.128.0/2110.242.128.1 – 10.242.135.25410.242.135.255
1810.242.136.0/2110.242.136.1 – 10.242.143.25410.242.143.255
1910.242.144.0/2110.242.144.1 – 10.242.151.25410.242.151.255
2010.242.152.0/2110.242.152.1 – 10.242.159.25410.242.159.255
2110.242.160.0/2110.242.160.1 – 10.242.167.25410.242.167.255
2210.242.168.0/2110.242.168.1 – 10.242.175.25410.242.175.255
2310.242.176.0/2110.242.176.1 – 10.242.183.25410.242.183.255
2410.242.184.0/2110.242.184.1 – 10.242.191.25410.242.191.255
2510.242.192.0/2110.242.192.1 – 10.242.199.25410.242.199.255
2610.242.200.0/2110.242.200.1 – 10.242.207.25410.242.207.255
2710.242.208.0/2110.242.208.1 – 10.242.215.25410.242.215.255
2810.242.216.0/2110.242.216.1 – 10.242.223.25410.242.223.255
2910.242.224.0/2110.242.224.1 – 10.242.231.25410.242.231.255
3010.242.232.0/2110.242.232.1 – 10.242.239.25410.242.239.255
3110.242.240.0/2110.242.240.1 – 10.242.247.25410.242.247.255
3210.242.248.0/2110.242.248.1 – 10.242.255.25410.242.255.255
3310.243.0.0/2110.243.0.1 – 10.243.7.25410.243.7.255
3410.243.8.0/2110.243.8.1 – 10.243.15.25410.243.15.255
3510.243.16.0/2110.243.16.1 – 10.243.23.25410.243.23.255
3610.243.24.0/2110.243.24.1 – 10.243.31.25410.243.31.255
3710.243.32.0/2110.243.32.1 – 10.243.39.25410.243.39.255
3810.243.40.0/2110.243.40.1 – 10.243.47.25410.243.47.255
3910.243.48.0/2110.243.48.1 – 10.243.55.25410.243.55.255
4010.243.56.0/2110.243.56.1 – 10.243.63.25410.243.63.255
4110.243.64.0/2110.243.64.1 – 10.243.71.25410.243.71.255
4210.243.72.0/2110.243.72.1 – 10.243.79.25410.243.79.255
4310.243.80.0/2110.243.80.1 – 10.243.87.25410.243.87.255
4410.243.88.0/2110.243.88.1 – 10.243.95.25410.243.95.255
4510.243.96.0/2110.243.96.1 – 10.243.103.25410.243.103.255
4610.243.104.0/2110.243.104.1 – 10.243.111.25410.243.111.255
4710.243.112.0/2110.243.112.1 – 10.243.119.25410.243.119.255
4810.243.120.0/2110.243.120.1 – 10.243.127.25410.243.127.255
4910.243.128.0/2110.243.128.1 – 10.243.135.25410.243.135.255
5010.243.136.0/2110.243.136.1 – 10.243.143.25410.243.143.255
5110.243.144.0/2110.243.144.1 – 10.243.151.25410.243.151.255
5210.243.152.0/2110.243.152.1 – 10.243.159.25410.243.159.255
5310.243.160.0/2110.243.160.1 – 10.243.167.25410.243.167.255
5410.243.168.0/2110.243.168.1 – 10.243.175.25410.243.175.255
5510.243.176.0/2110.243.176.1 – 10.243.183.25410.243.183.255
5610.243.184.0/2110.243.184.1 – 10.243.191.25410.243.191.255
5710.243.192.0/2110.243.192.1 – 10.243.199.25410.243.199.255
5810.243.200.0/2110.243.200.1 – 10.243.207.25410.243.207.255
5910.243.208.0/2110.243.208.1 – 10.243.215.25410.243.215.255
6010.243.216.0/2110.243.216.1 – 10.243.223.25410.243.223.255
6110.243.224.0/2110.243.224.1 – 10.243.231.25410.243.231.255
6210.243.232.0/2110.243.232.1 – 10.243.239.25410.243.239.255
6310.243.240.0/2110.243.240.1 – 10.243.247.25410.243.247.255
6410.243.248.0/2110.243.248.1 – 10.243.255.25410.243.255.255
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 →