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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)10.152.0.0/15
network10.152.0.0/15
broadcast10.153.255.255
first host10.152.0.1
last host10.153.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.152.0.0/15
address00001010.10011000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10011000.00000000.00000000
broadcast00001010.10011001.11111111.11111111
green = network part, grey = host part
hex0x0a980000
decimal177733632
reverse dns0.0.152.10.in-addr.arpa
ipv4-mapped::ffff:a98:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.152.0.0/2110.152.0.1 – 10.152.7.25410.152.7.255
210.152.8.0/2110.152.8.1 – 10.152.15.25410.152.15.255
310.152.16.0/2110.152.16.1 – 10.152.23.25410.152.23.255
410.152.24.0/2110.152.24.1 – 10.152.31.25410.152.31.255
510.152.32.0/2110.152.32.1 – 10.152.39.25410.152.39.255
610.152.40.0/2110.152.40.1 – 10.152.47.25410.152.47.255
710.152.48.0/2110.152.48.1 – 10.152.55.25410.152.55.255
810.152.56.0/2110.152.56.1 – 10.152.63.25410.152.63.255
910.152.64.0/2110.152.64.1 – 10.152.71.25410.152.71.255
1010.152.72.0/2110.152.72.1 – 10.152.79.25410.152.79.255
1110.152.80.0/2110.152.80.1 – 10.152.87.25410.152.87.255
1210.152.88.0/2110.152.88.1 – 10.152.95.25410.152.95.255
1310.152.96.0/2110.152.96.1 – 10.152.103.25410.152.103.255
1410.152.104.0/2110.152.104.1 – 10.152.111.25410.152.111.255
1510.152.112.0/2110.152.112.1 – 10.152.119.25410.152.119.255
1610.152.120.0/2110.152.120.1 – 10.152.127.25410.152.127.255
1710.152.128.0/2110.152.128.1 – 10.152.135.25410.152.135.255
1810.152.136.0/2110.152.136.1 – 10.152.143.25410.152.143.255
1910.152.144.0/2110.152.144.1 – 10.152.151.25410.152.151.255
2010.152.152.0/2110.152.152.1 – 10.152.159.25410.152.159.255
2110.152.160.0/2110.152.160.1 – 10.152.167.25410.152.167.255
2210.152.168.0/2110.152.168.1 – 10.152.175.25410.152.175.255
2310.152.176.0/2110.152.176.1 – 10.152.183.25410.152.183.255
2410.152.184.0/2110.152.184.1 – 10.152.191.25410.152.191.255
2510.152.192.0/2110.152.192.1 – 10.152.199.25410.152.199.255
2610.152.200.0/2110.152.200.1 – 10.152.207.25410.152.207.255
2710.152.208.0/2110.152.208.1 – 10.152.215.25410.152.215.255
2810.152.216.0/2110.152.216.1 – 10.152.223.25410.152.223.255
2910.152.224.0/2110.152.224.1 – 10.152.231.25410.152.231.255
3010.152.232.0/2110.152.232.1 – 10.152.239.25410.152.239.255
3110.152.240.0/2110.152.240.1 – 10.152.247.25410.152.247.255
3210.152.248.0/2110.152.248.1 – 10.152.255.25410.152.255.255
3310.153.0.0/2110.153.0.1 – 10.153.7.25410.153.7.255
3410.153.8.0/2110.153.8.1 – 10.153.15.25410.153.15.255
3510.153.16.0/2110.153.16.1 – 10.153.23.25410.153.23.255
3610.153.24.0/2110.153.24.1 – 10.153.31.25410.153.31.255
3710.153.32.0/2110.153.32.1 – 10.153.39.25410.153.39.255
3810.153.40.0/2110.153.40.1 – 10.153.47.25410.153.47.255
3910.153.48.0/2110.153.48.1 – 10.153.55.25410.153.55.255
4010.153.56.0/2110.153.56.1 – 10.153.63.25410.153.63.255
4110.153.64.0/2110.153.64.1 – 10.153.71.25410.153.71.255
4210.153.72.0/2110.153.72.1 – 10.153.79.25410.153.79.255
4310.153.80.0/2110.153.80.1 – 10.153.87.25410.153.87.255
4410.153.88.0/2110.153.88.1 – 10.153.95.25410.153.95.255
4510.153.96.0/2110.153.96.1 – 10.153.103.25410.153.103.255
4610.153.104.0/2110.153.104.1 – 10.153.111.25410.153.111.255
4710.153.112.0/2110.153.112.1 – 10.153.119.25410.153.119.255
4810.153.120.0/2110.153.120.1 – 10.153.127.25410.153.127.255
4910.153.128.0/2110.153.128.1 – 10.153.135.25410.153.135.255
5010.153.136.0/2110.153.136.1 – 10.153.143.25410.153.143.255
5110.153.144.0/2110.153.144.1 – 10.153.151.25410.153.151.255
5210.153.152.0/2110.153.152.1 – 10.153.159.25410.153.159.255
5310.153.160.0/2110.153.160.1 – 10.153.167.25410.153.167.255
5410.153.168.0/2110.153.168.1 – 10.153.175.25410.153.175.255
5510.153.176.0/2110.153.176.1 – 10.153.183.25410.153.183.255
5610.153.184.0/2110.153.184.1 – 10.153.191.25410.153.191.255
5710.153.192.0/2110.153.192.1 – 10.153.199.25410.153.199.255
5810.153.200.0/2110.153.200.1 – 10.153.207.25410.153.207.255
5910.153.208.0/2110.153.208.1 – 10.153.215.25410.153.215.255
6010.153.216.0/2110.153.216.1 – 10.153.223.25410.153.223.255
6110.153.224.0/2110.153.224.1 – 10.153.231.25410.153.231.255
6210.153.232.0/2110.153.232.1 – 10.153.239.25410.153.239.255
6310.153.240.0/2110.153.240.1 – 10.153.247.25410.153.247.255
6410.153.248.0/2110.153.248.1 – 10.153.255.25410.153.255.255
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 →