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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)10.114.0.0/15
network10.114.0.0/15
broadcast10.115.255.255
first host10.114.0.1
last host10.115.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.114.0.0/15
address00001010.01110010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01110010.00000000.00000000
broadcast00001010.01110011.11111111.11111111
green = network part, grey = host part
hex0x0a720000
decimal175243264
reverse dns0.0.114.10.in-addr.arpa
ipv4-mapped::ffff:a72:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.114.0.0/2110.114.0.1 – 10.114.7.25410.114.7.255
210.114.8.0/2110.114.8.1 – 10.114.15.25410.114.15.255
310.114.16.0/2110.114.16.1 – 10.114.23.25410.114.23.255
410.114.24.0/2110.114.24.1 – 10.114.31.25410.114.31.255
510.114.32.0/2110.114.32.1 – 10.114.39.25410.114.39.255
610.114.40.0/2110.114.40.1 – 10.114.47.25410.114.47.255
710.114.48.0/2110.114.48.1 – 10.114.55.25410.114.55.255
810.114.56.0/2110.114.56.1 – 10.114.63.25410.114.63.255
910.114.64.0/2110.114.64.1 – 10.114.71.25410.114.71.255
1010.114.72.0/2110.114.72.1 – 10.114.79.25410.114.79.255
1110.114.80.0/2110.114.80.1 – 10.114.87.25410.114.87.255
1210.114.88.0/2110.114.88.1 – 10.114.95.25410.114.95.255
1310.114.96.0/2110.114.96.1 – 10.114.103.25410.114.103.255
1410.114.104.0/2110.114.104.1 – 10.114.111.25410.114.111.255
1510.114.112.0/2110.114.112.1 – 10.114.119.25410.114.119.255
1610.114.120.0/2110.114.120.1 – 10.114.127.25410.114.127.255
1710.114.128.0/2110.114.128.1 – 10.114.135.25410.114.135.255
1810.114.136.0/2110.114.136.1 – 10.114.143.25410.114.143.255
1910.114.144.0/2110.114.144.1 – 10.114.151.25410.114.151.255
2010.114.152.0/2110.114.152.1 – 10.114.159.25410.114.159.255
2110.114.160.0/2110.114.160.1 – 10.114.167.25410.114.167.255
2210.114.168.0/2110.114.168.1 – 10.114.175.25410.114.175.255
2310.114.176.0/2110.114.176.1 – 10.114.183.25410.114.183.255
2410.114.184.0/2110.114.184.1 – 10.114.191.25410.114.191.255
2510.114.192.0/2110.114.192.1 – 10.114.199.25410.114.199.255
2610.114.200.0/2110.114.200.1 – 10.114.207.25410.114.207.255
2710.114.208.0/2110.114.208.1 – 10.114.215.25410.114.215.255
2810.114.216.0/2110.114.216.1 – 10.114.223.25410.114.223.255
2910.114.224.0/2110.114.224.1 – 10.114.231.25410.114.231.255
3010.114.232.0/2110.114.232.1 – 10.114.239.25410.114.239.255
3110.114.240.0/2110.114.240.1 – 10.114.247.25410.114.247.255
3210.114.248.0/2110.114.248.1 – 10.114.255.25410.114.255.255
3310.115.0.0/2110.115.0.1 – 10.115.7.25410.115.7.255
3410.115.8.0/2110.115.8.1 – 10.115.15.25410.115.15.255
3510.115.16.0/2110.115.16.1 – 10.115.23.25410.115.23.255
3610.115.24.0/2110.115.24.1 – 10.115.31.25410.115.31.255
3710.115.32.0/2110.115.32.1 – 10.115.39.25410.115.39.255
3810.115.40.0/2110.115.40.1 – 10.115.47.25410.115.47.255
3910.115.48.0/2110.115.48.1 – 10.115.55.25410.115.55.255
4010.115.56.0/2110.115.56.1 – 10.115.63.25410.115.63.255
4110.115.64.0/2110.115.64.1 – 10.115.71.25410.115.71.255
4210.115.72.0/2110.115.72.1 – 10.115.79.25410.115.79.255
4310.115.80.0/2110.115.80.1 – 10.115.87.25410.115.87.255
4410.115.88.0/2110.115.88.1 – 10.115.95.25410.115.95.255
4510.115.96.0/2110.115.96.1 – 10.115.103.25410.115.103.255
4610.115.104.0/2110.115.104.1 – 10.115.111.25410.115.111.255
4710.115.112.0/2110.115.112.1 – 10.115.119.25410.115.119.255
4810.115.120.0/2110.115.120.1 – 10.115.127.25410.115.127.255
4910.115.128.0/2110.115.128.1 – 10.115.135.25410.115.135.255
5010.115.136.0/2110.115.136.1 – 10.115.143.25410.115.143.255
5110.115.144.0/2110.115.144.1 – 10.115.151.25410.115.151.255
5210.115.152.0/2110.115.152.1 – 10.115.159.25410.115.159.255
5310.115.160.0/2110.115.160.1 – 10.115.167.25410.115.167.255
5410.115.168.0/2110.115.168.1 – 10.115.175.25410.115.175.255
5510.115.176.0/2110.115.176.1 – 10.115.183.25410.115.183.255
5610.115.184.0/2110.115.184.1 – 10.115.191.25410.115.191.255
5710.115.192.0/2110.115.192.1 – 10.115.199.25410.115.199.255
5810.115.200.0/2110.115.200.1 – 10.115.207.25410.115.207.255
5910.115.208.0/2110.115.208.1 – 10.115.215.25410.115.215.255
6010.115.216.0/2110.115.216.1 – 10.115.223.25410.115.223.255
6110.115.224.0/2110.115.224.1 – 10.115.231.25410.115.231.255
6210.115.232.0/2110.115.232.1 – 10.115.239.25410.115.239.255
6310.115.240.0/2110.115.240.1 – 10.115.247.25410.115.247.255
6410.115.248.0/2110.115.248.1 – 10.115.255.25410.115.255.255
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 →