ip
ipku.in

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)10.202.0.0/15
network10.202.0.0/15
broadcast10.203.255.255
first host10.202.0.1
last host10.203.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.202.0.0/15
address00001010.11001010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11001010.00000000.00000000
broadcast00001010.11001011.11111111.11111111
green = network part, grey = host part
hex0x0aca0000
decimal181010432
reverse dns0.0.202.10.in-addr.arpa
ipv4-mapped::ffff:aca:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.202.0.0/2110.202.0.1 – 10.202.7.25410.202.7.255
210.202.8.0/2110.202.8.1 – 10.202.15.25410.202.15.255
310.202.16.0/2110.202.16.1 – 10.202.23.25410.202.23.255
410.202.24.0/2110.202.24.1 – 10.202.31.25410.202.31.255
510.202.32.0/2110.202.32.1 – 10.202.39.25410.202.39.255
610.202.40.0/2110.202.40.1 – 10.202.47.25410.202.47.255
710.202.48.0/2110.202.48.1 – 10.202.55.25410.202.55.255
810.202.56.0/2110.202.56.1 – 10.202.63.25410.202.63.255
910.202.64.0/2110.202.64.1 – 10.202.71.25410.202.71.255
1010.202.72.0/2110.202.72.1 – 10.202.79.25410.202.79.255
1110.202.80.0/2110.202.80.1 – 10.202.87.25410.202.87.255
1210.202.88.0/2110.202.88.1 – 10.202.95.25410.202.95.255
1310.202.96.0/2110.202.96.1 – 10.202.103.25410.202.103.255
1410.202.104.0/2110.202.104.1 – 10.202.111.25410.202.111.255
1510.202.112.0/2110.202.112.1 – 10.202.119.25410.202.119.255
1610.202.120.0/2110.202.120.1 – 10.202.127.25410.202.127.255
1710.202.128.0/2110.202.128.1 – 10.202.135.25410.202.135.255
1810.202.136.0/2110.202.136.1 – 10.202.143.25410.202.143.255
1910.202.144.0/2110.202.144.1 – 10.202.151.25410.202.151.255
2010.202.152.0/2110.202.152.1 – 10.202.159.25410.202.159.255
2110.202.160.0/2110.202.160.1 – 10.202.167.25410.202.167.255
2210.202.168.0/2110.202.168.1 – 10.202.175.25410.202.175.255
2310.202.176.0/2110.202.176.1 – 10.202.183.25410.202.183.255
2410.202.184.0/2110.202.184.1 – 10.202.191.25410.202.191.255
2510.202.192.0/2110.202.192.1 – 10.202.199.25410.202.199.255
2610.202.200.0/2110.202.200.1 – 10.202.207.25410.202.207.255
2710.202.208.0/2110.202.208.1 – 10.202.215.25410.202.215.255
2810.202.216.0/2110.202.216.1 – 10.202.223.25410.202.223.255
2910.202.224.0/2110.202.224.1 – 10.202.231.25410.202.231.255
3010.202.232.0/2110.202.232.1 – 10.202.239.25410.202.239.255
3110.202.240.0/2110.202.240.1 – 10.202.247.25410.202.247.255
3210.202.248.0/2110.202.248.1 – 10.202.255.25410.202.255.255
3310.203.0.0/2110.203.0.1 – 10.203.7.25410.203.7.255
3410.203.8.0/2110.203.8.1 – 10.203.15.25410.203.15.255
3510.203.16.0/2110.203.16.1 – 10.203.23.25410.203.23.255
3610.203.24.0/2110.203.24.1 – 10.203.31.25410.203.31.255
3710.203.32.0/2110.203.32.1 – 10.203.39.25410.203.39.255
3810.203.40.0/2110.203.40.1 – 10.203.47.25410.203.47.255
3910.203.48.0/2110.203.48.1 – 10.203.55.25410.203.55.255
4010.203.56.0/2110.203.56.1 – 10.203.63.25410.203.63.255
4110.203.64.0/2110.203.64.1 – 10.203.71.25410.203.71.255
4210.203.72.0/2110.203.72.1 – 10.203.79.25410.203.79.255
4310.203.80.0/2110.203.80.1 – 10.203.87.25410.203.87.255
4410.203.88.0/2110.203.88.1 – 10.203.95.25410.203.95.255
4510.203.96.0/2110.203.96.1 – 10.203.103.25410.203.103.255
4610.203.104.0/2110.203.104.1 – 10.203.111.25410.203.111.255
4710.203.112.0/2110.203.112.1 – 10.203.119.25410.203.119.255
4810.203.120.0/2110.203.120.1 – 10.203.127.25410.203.127.255
4910.203.128.0/2110.203.128.1 – 10.203.135.25410.203.135.255
5010.203.136.0/2110.203.136.1 – 10.203.143.25410.203.143.255
5110.203.144.0/2110.203.144.1 – 10.203.151.25410.203.151.255
5210.203.152.0/2110.203.152.1 – 10.203.159.25410.203.159.255
5310.203.160.0/2110.203.160.1 – 10.203.167.25410.203.167.255
5410.203.168.0/2110.203.168.1 – 10.203.175.25410.203.175.255
5510.203.176.0/2110.203.176.1 – 10.203.183.25410.203.183.255
5610.203.184.0/2110.203.184.1 – 10.203.191.25410.203.191.255
5710.203.192.0/2110.203.192.1 – 10.203.199.25410.203.199.255
5810.203.200.0/2110.203.200.1 – 10.203.207.25410.203.207.255
5910.203.208.0/2110.203.208.1 – 10.203.215.25410.203.215.255
6010.203.216.0/2110.203.216.1 – 10.203.223.25410.203.223.255
6110.203.224.0/2110.203.224.1 – 10.203.231.25410.203.231.255
6210.203.232.0/2110.203.232.1 – 10.203.239.25410.203.239.255
6310.203.240.0/2110.203.240.1 – 10.203.247.25410.203.247.255
6410.203.248.0/2110.203.248.1 – 10.203.255.25410.203.255.255
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 →