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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)10.74.0.0/15
network10.74.0.0/15
broadcast10.75.255.255
first host10.74.0.1
last host10.75.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.74.0.0/15
address00001010.01001010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01001010.00000000.00000000
broadcast00001010.01001011.11111111.11111111
green = network part, grey = host part
hex0x0a4a0000
decimal172621824
reverse dns0.0.74.10.in-addr.arpa
ipv4-mapped::ffff:a4a:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.74.0.0/2110.74.0.1 – 10.74.7.25410.74.7.255
210.74.8.0/2110.74.8.1 – 10.74.15.25410.74.15.255
310.74.16.0/2110.74.16.1 – 10.74.23.25410.74.23.255
410.74.24.0/2110.74.24.1 – 10.74.31.25410.74.31.255
510.74.32.0/2110.74.32.1 – 10.74.39.25410.74.39.255
610.74.40.0/2110.74.40.1 – 10.74.47.25410.74.47.255
710.74.48.0/2110.74.48.1 – 10.74.55.25410.74.55.255
810.74.56.0/2110.74.56.1 – 10.74.63.25410.74.63.255
910.74.64.0/2110.74.64.1 – 10.74.71.25410.74.71.255
1010.74.72.0/2110.74.72.1 – 10.74.79.25410.74.79.255
1110.74.80.0/2110.74.80.1 – 10.74.87.25410.74.87.255
1210.74.88.0/2110.74.88.1 – 10.74.95.25410.74.95.255
1310.74.96.0/2110.74.96.1 – 10.74.103.25410.74.103.255
1410.74.104.0/2110.74.104.1 – 10.74.111.25410.74.111.255
1510.74.112.0/2110.74.112.1 – 10.74.119.25410.74.119.255
1610.74.120.0/2110.74.120.1 – 10.74.127.25410.74.127.255
1710.74.128.0/2110.74.128.1 – 10.74.135.25410.74.135.255
1810.74.136.0/2110.74.136.1 – 10.74.143.25410.74.143.255
1910.74.144.0/2110.74.144.1 – 10.74.151.25410.74.151.255
2010.74.152.0/2110.74.152.1 – 10.74.159.25410.74.159.255
2110.74.160.0/2110.74.160.1 – 10.74.167.25410.74.167.255
2210.74.168.0/2110.74.168.1 – 10.74.175.25410.74.175.255
2310.74.176.0/2110.74.176.1 – 10.74.183.25410.74.183.255
2410.74.184.0/2110.74.184.1 – 10.74.191.25410.74.191.255
2510.74.192.0/2110.74.192.1 – 10.74.199.25410.74.199.255
2610.74.200.0/2110.74.200.1 – 10.74.207.25410.74.207.255
2710.74.208.0/2110.74.208.1 – 10.74.215.25410.74.215.255
2810.74.216.0/2110.74.216.1 – 10.74.223.25410.74.223.255
2910.74.224.0/2110.74.224.1 – 10.74.231.25410.74.231.255
3010.74.232.0/2110.74.232.1 – 10.74.239.25410.74.239.255
3110.74.240.0/2110.74.240.1 – 10.74.247.25410.74.247.255
3210.74.248.0/2110.74.248.1 – 10.74.255.25410.74.255.255
3310.75.0.0/2110.75.0.1 – 10.75.7.25410.75.7.255
3410.75.8.0/2110.75.8.1 – 10.75.15.25410.75.15.255
3510.75.16.0/2110.75.16.1 – 10.75.23.25410.75.23.255
3610.75.24.0/2110.75.24.1 – 10.75.31.25410.75.31.255
3710.75.32.0/2110.75.32.1 – 10.75.39.25410.75.39.255
3810.75.40.0/2110.75.40.1 – 10.75.47.25410.75.47.255
3910.75.48.0/2110.75.48.1 – 10.75.55.25410.75.55.255
4010.75.56.0/2110.75.56.1 – 10.75.63.25410.75.63.255
4110.75.64.0/2110.75.64.1 – 10.75.71.25410.75.71.255
4210.75.72.0/2110.75.72.1 – 10.75.79.25410.75.79.255
4310.75.80.0/2110.75.80.1 – 10.75.87.25410.75.87.255
4410.75.88.0/2110.75.88.1 – 10.75.95.25410.75.95.255
4510.75.96.0/2110.75.96.1 – 10.75.103.25410.75.103.255
4610.75.104.0/2110.75.104.1 – 10.75.111.25410.75.111.255
4710.75.112.0/2110.75.112.1 – 10.75.119.25410.75.119.255
4810.75.120.0/2110.75.120.1 – 10.75.127.25410.75.127.255
4910.75.128.0/2110.75.128.1 – 10.75.135.25410.75.135.255
5010.75.136.0/2110.75.136.1 – 10.75.143.25410.75.143.255
5110.75.144.0/2110.75.144.1 – 10.75.151.25410.75.151.255
5210.75.152.0/2110.75.152.1 – 10.75.159.25410.75.159.255
5310.75.160.0/2110.75.160.1 – 10.75.167.25410.75.167.255
5410.75.168.0/2110.75.168.1 – 10.75.175.25410.75.175.255
5510.75.176.0/2110.75.176.1 – 10.75.183.25410.75.183.255
5610.75.184.0/2110.75.184.1 – 10.75.191.25410.75.191.255
5710.75.192.0/2110.75.192.1 – 10.75.199.25410.75.199.255
5810.75.200.0/2110.75.200.1 – 10.75.207.25410.75.207.255
5910.75.208.0/2110.75.208.1 – 10.75.215.25410.75.215.255
6010.75.216.0/2110.75.216.1 – 10.75.223.25410.75.223.255
6110.75.224.0/2110.75.224.1 – 10.75.231.25410.75.231.255
6210.75.232.0/2110.75.232.1 – 10.75.239.25410.75.239.255
6310.75.240.0/2110.75.240.1 – 10.75.247.25410.75.247.255
6410.75.248.0/2110.75.248.1 – 10.75.255.25410.75.255.255
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 →