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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)10.38.0.0/15
network10.38.0.0/15
broadcast10.39.255.255
first host10.38.0.1
last host10.39.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.38.0.0/15
address00001010.00100110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00100110.00000000.00000000
broadcast00001010.00100111.11111111.11111111
green = network part, grey = host part
hex0x0a260000
decimal170262528
reverse dns0.0.38.10.in-addr.arpa
ipv4-mapped::ffff:a26:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.38.0.0/2110.38.0.1 – 10.38.7.25410.38.7.255
210.38.8.0/2110.38.8.1 – 10.38.15.25410.38.15.255
310.38.16.0/2110.38.16.1 – 10.38.23.25410.38.23.255
410.38.24.0/2110.38.24.1 – 10.38.31.25410.38.31.255
510.38.32.0/2110.38.32.1 – 10.38.39.25410.38.39.255
610.38.40.0/2110.38.40.1 – 10.38.47.25410.38.47.255
710.38.48.0/2110.38.48.1 – 10.38.55.25410.38.55.255
810.38.56.0/2110.38.56.1 – 10.38.63.25410.38.63.255
910.38.64.0/2110.38.64.1 – 10.38.71.25410.38.71.255
1010.38.72.0/2110.38.72.1 – 10.38.79.25410.38.79.255
1110.38.80.0/2110.38.80.1 – 10.38.87.25410.38.87.255
1210.38.88.0/2110.38.88.1 – 10.38.95.25410.38.95.255
1310.38.96.0/2110.38.96.1 – 10.38.103.25410.38.103.255
1410.38.104.0/2110.38.104.1 – 10.38.111.25410.38.111.255
1510.38.112.0/2110.38.112.1 – 10.38.119.25410.38.119.255
1610.38.120.0/2110.38.120.1 – 10.38.127.25410.38.127.255
1710.38.128.0/2110.38.128.1 – 10.38.135.25410.38.135.255
1810.38.136.0/2110.38.136.1 – 10.38.143.25410.38.143.255
1910.38.144.0/2110.38.144.1 – 10.38.151.25410.38.151.255
2010.38.152.0/2110.38.152.1 – 10.38.159.25410.38.159.255
2110.38.160.0/2110.38.160.1 – 10.38.167.25410.38.167.255
2210.38.168.0/2110.38.168.1 – 10.38.175.25410.38.175.255
2310.38.176.0/2110.38.176.1 – 10.38.183.25410.38.183.255
2410.38.184.0/2110.38.184.1 – 10.38.191.25410.38.191.255
2510.38.192.0/2110.38.192.1 – 10.38.199.25410.38.199.255
2610.38.200.0/2110.38.200.1 – 10.38.207.25410.38.207.255
2710.38.208.0/2110.38.208.1 – 10.38.215.25410.38.215.255
2810.38.216.0/2110.38.216.1 – 10.38.223.25410.38.223.255
2910.38.224.0/2110.38.224.1 – 10.38.231.25410.38.231.255
3010.38.232.0/2110.38.232.1 – 10.38.239.25410.38.239.255
3110.38.240.0/2110.38.240.1 – 10.38.247.25410.38.247.255
3210.38.248.0/2110.38.248.1 – 10.38.255.25410.38.255.255
3310.39.0.0/2110.39.0.1 – 10.39.7.25410.39.7.255
3410.39.8.0/2110.39.8.1 – 10.39.15.25410.39.15.255
3510.39.16.0/2110.39.16.1 – 10.39.23.25410.39.23.255
3610.39.24.0/2110.39.24.1 – 10.39.31.25410.39.31.255
3710.39.32.0/2110.39.32.1 – 10.39.39.25410.39.39.255
3810.39.40.0/2110.39.40.1 – 10.39.47.25410.39.47.255
3910.39.48.0/2110.39.48.1 – 10.39.55.25410.39.55.255
4010.39.56.0/2110.39.56.1 – 10.39.63.25410.39.63.255
4110.39.64.0/2110.39.64.1 – 10.39.71.25410.39.71.255
4210.39.72.0/2110.39.72.1 – 10.39.79.25410.39.79.255
4310.39.80.0/2110.39.80.1 – 10.39.87.25410.39.87.255
4410.39.88.0/2110.39.88.1 – 10.39.95.25410.39.95.255
4510.39.96.0/2110.39.96.1 – 10.39.103.25410.39.103.255
4610.39.104.0/2110.39.104.1 – 10.39.111.25410.39.111.255
4710.39.112.0/2110.39.112.1 – 10.39.119.25410.39.119.255
4810.39.120.0/2110.39.120.1 – 10.39.127.25410.39.127.255
4910.39.128.0/2110.39.128.1 – 10.39.135.25410.39.135.255
5010.39.136.0/2110.39.136.1 – 10.39.143.25410.39.143.255
5110.39.144.0/2110.39.144.1 – 10.39.151.25410.39.151.255
5210.39.152.0/2110.39.152.1 – 10.39.159.25410.39.159.255
5310.39.160.0/2110.39.160.1 – 10.39.167.25410.39.167.255
5410.39.168.0/2110.39.168.1 – 10.39.175.25410.39.175.255
5510.39.176.0/2110.39.176.1 – 10.39.183.25410.39.183.255
5610.39.184.0/2110.39.184.1 – 10.39.191.25410.39.191.255
5710.39.192.0/2110.39.192.1 – 10.39.199.25410.39.199.255
5810.39.200.0/2110.39.200.1 – 10.39.207.25410.39.207.255
5910.39.208.0/2110.39.208.1 – 10.39.215.25410.39.215.255
6010.39.216.0/2110.39.216.1 – 10.39.223.25410.39.223.255
6110.39.224.0/2110.39.224.1 – 10.39.231.25410.39.231.255
6210.39.232.0/2110.39.232.1 – 10.39.239.25410.39.239.255
6310.39.240.0/2110.39.240.1 – 10.39.247.25410.39.247.255
6410.39.248.0/2110.39.248.1 – 10.39.255.25410.39.255.255
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 →