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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)10.94.0.0/15
network10.94.0.0/15
broadcast10.95.255.255
first host10.94.0.1
last host10.95.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.94.0.0/15
address00001010.01011110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01011110.00000000.00000000
broadcast00001010.01011111.11111111.11111111
green = network part, grey = host part
hex0x0a5e0000
decimal173932544
reverse dns0.0.94.10.in-addr.arpa
ipv4-mapped::ffff:a5e:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.94.0.0/2110.94.0.1 – 10.94.7.25410.94.7.255
210.94.8.0/2110.94.8.1 – 10.94.15.25410.94.15.255
310.94.16.0/2110.94.16.1 – 10.94.23.25410.94.23.255
410.94.24.0/2110.94.24.1 – 10.94.31.25410.94.31.255
510.94.32.0/2110.94.32.1 – 10.94.39.25410.94.39.255
610.94.40.0/2110.94.40.1 – 10.94.47.25410.94.47.255
710.94.48.0/2110.94.48.1 – 10.94.55.25410.94.55.255
810.94.56.0/2110.94.56.1 – 10.94.63.25410.94.63.255
910.94.64.0/2110.94.64.1 – 10.94.71.25410.94.71.255
1010.94.72.0/2110.94.72.1 – 10.94.79.25410.94.79.255
1110.94.80.0/2110.94.80.1 – 10.94.87.25410.94.87.255
1210.94.88.0/2110.94.88.1 – 10.94.95.25410.94.95.255
1310.94.96.0/2110.94.96.1 – 10.94.103.25410.94.103.255
1410.94.104.0/2110.94.104.1 – 10.94.111.25410.94.111.255
1510.94.112.0/2110.94.112.1 – 10.94.119.25410.94.119.255
1610.94.120.0/2110.94.120.1 – 10.94.127.25410.94.127.255
1710.94.128.0/2110.94.128.1 – 10.94.135.25410.94.135.255
1810.94.136.0/2110.94.136.1 – 10.94.143.25410.94.143.255
1910.94.144.0/2110.94.144.1 – 10.94.151.25410.94.151.255
2010.94.152.0/2110.94.152.1 – 10.94.159.25410.94.159.255
2110.94.160.0/2110.94.160.1 – 10.94.167.25410.94.167.255
2210.94.168.0/2110.94.168.1 – 10.94.175.25410.94.175.255
2310.94.176.0/2110.94.176.1 – 10.94.183.25410.94.183.255
2410.94.184.0/2110.94.184.1 – 10.94.191.25410.94.191.255
2510.94.192.0/2110.94.192.1 – 10.94.199.25410.94.199.255
2610.94.200.0/2110.94.200.1 – 10.94.207.25410.94.207.255
2710.94.208.0/2110.94.208.1 – 10.94.215.25410.94.215.255
2810.94.216.0/2110.94.216.1 – 10.94.223.25410.94.223.255
2910.94.224.0/2110.94.224.1 – 10.94.231.25410.94.231.255
3010.94.232.0/2110.94.232.1 – 10.94.239.25410.94.239.255
3110.94.240.0/2110.94.240.1 – 10.94.247.25410.94.247.255
3210.94.248.0/2110.94.248.1 – 10.94.255.25410.94.255.255
3310.95.0.0/2110.95.0.1 – 10.95.7.25410.95.7.255
3410.95.8.0/2110.95.8.1 – 10.95.15.25410.95.15.255
3510.95.16.0/2110.95.16.1 – 10.95.23.25410.95.23.255
3610.95.24.0/2110.95.24.1 – 10.95.31.25410.95.31.255
3710.95.32.0/2110.95.32.1 – 10.95.39.25410.95.39.255
3810.95.40.0/2110.95.40.1 – 10.95.47.25410.95.47.255
3910.95.48.0/2110.95.48.1 – 10.95.55.25410.95.55.255
4010.95.56.0/2110.95.56.1 – 10.95.63.25410.95.63.255
4110.95.64.0/2110.95.64.1 – 10.95.71.25410.95.71.255
4210.95.72.0/2110.95.72.1 – 10.95.79.25410.95.79.255
4310.95.80.0/2110.95.80.1 – 10.95.87.25410.95.87.255
4410.95.88.0/2110.95.88.1 – 10.95.95.25410.95.95.255
4510.95.96.0/2110.95.96.1 – 10.95.103.25410.95.103.255
4610.95.104.0/2110.95.104.1 – 10.95.111.25410.95.111.255
4710.95.112.0/2110.95.112.1 – 10.95.119.25410.95.119.255
4810.95.120.0/2110.95.120.1 – 10.95.127.25410.95.127.255
4910.95.128.0/2110.95.128.1 – 10.95.135.25410.95.135.255
5010.95.136.0/2110.95.136.1 – 10.95.143.25410.95.143.255
5110.95.144.0/2110.95.144.1 – 10.95.151.25410.95.151.255
5210.95.152.0/2110.95.152.1 – 10.95.159.25410.95.159.255
5310.95.160.0/2110.95.160.1 – 10.95.167.25410.95.167.255
5410.95.168.0/2110.95.168.1 – 10.95.175.25410.95.175.255
5510.95.176.0/2110.95.176.1 – 10.95.183.25410.95.183.255
5610.95.184.0/2110.95.184.1 – 10.95.191.25410.95.191.255
5710.95.192.0/2110.95.192.1 – 10.95.199.25410.95.199.255
5810.95.200.0/2110.95.200.1 – 10.95.207.25410.95.207.255
5910.95.208.0/2110.95.208.1 – 10.95.215.25410.95.215.255
6010.95.216.0/2110.95.216.1 – 10.95.223.25410.95.223.255
6110.95.224.0/2110.95.224.1 – 10.95.231.25410.95.231.255
6210.95.232.0/2110.95.232.1 – 10.95.239.25410.95.239.255
6310.95.240.0/2110.95.240.1 – 10.95.247.25410.95.247.255
6410.95.248.0/2110.95.248.1 – 10.95.255.25410.95.255.255
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 →