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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)10.148.0.0/15
network10.148.0.0/15
broadcast10.149.255.255
first host10.148.0.1
last host10.149.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.148.0.0/15
address00001010.10010100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10010100.00000000.00000000
broadcast00001010.10010101.11111111.11111111
green = network part, grey = host part
hex0x0a940000
decimal177471488
reverse dns0.0.148.10.in-addr.arpa
ipv4-mapped::ffff:a94:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.148.0.0/2110.148.0.1 – 10.148.7.25410.148.7.255
210.148.8.0/2110.148.8.1 – 10.148.15.25410.148.15.255
310.148.16.0/2110.148.16.1 – 10.148.23.25410.148.23.255
410.148.24.0/2110.148.24.1 – 10.148.31.25410.148.31.255
510.148.32.0/2110.148.32.1 – 10.148.39.25410.148.39.255
610.148.40.0/2110.148.40.1 – 10.148.47.25410.148.47.255
710.148.48.0/2110.148.48.1 – 10.148.55.25410.148.55.255
810.148.56.0/2110.148.56.1 – 10.148.63.25410.148.63.255
910.148.64.0/2110.148.64.1 – 10.148.71.25410.148.71.255
1010.148.72.0/2110.148.72.1 – 10.148.79.25410.148.79.255
1110.148.80.0/2110.148.80.1 – 10.148.87.25410.148.87.255
1210.148.88.0/2110.148.88.1 – 10.148.95.25410.148.95.255
1310.148.96.0/2110.148.96.1 – 10.148.103.25410.148.103.255
1410.148.104.0/2110.148.104.1 – 10.148.111.25410.148.111.255
1510.148.112.0/2110.148.112.1 – 10.148.119.25410.148.119.255
1610.148.120.0/2110.148.120.1 – 10.148.127.25410.148.127.255
1710.148.128.0/2110.148.128.1 – 10.148.135.25410.148.135.255
1810.148.136.0/2110.148.136.1 – 10.148.143.25410.148.143.255
1910.148.144.0/2110.148.144.1 – 10.148.151.25410.148.151.255
2010.148.152.0/2110.148.152.1 – 10.148.159.25410.148.159.255
2110.148.160.0/2110.148.160.1 – 10.148.167.25410.148.167.255
2210.148.168.0/2110.148.168.1 – 10.148.175.25410.148.175.255
2310.148.176.0/2110.148.176.1 – 10.148.183.25410.148.183.255
2410.148.184.0/2110.148.184.1 – 10.148.191.25410.148.191.255
2510.148.192.0/2110.148.192.1 – 10.148.199.25410.148.199.255
2610.148.200.0/2110.148.200.1 – 10.148.207.25410.148.207.255
2710.148.208.0/2110.148.208.1 – 10.148.215.25410.148.215.255
2810.148.216.0/2110.148.216.1 – 10.148.223.25410.148.223.255
2910.148.224.0/2110.148.224.1 – 10.148.231.25410.148.231.255
3010.148.232.0/2110.148.232.1 – 10.148.239.25410.148.239.255
3110.148.240.0/2110.148.240.1 – 10.148.247.25410.148.247.255
3210.148.248.0/2110.148.248.1 – 10.148.255.25410.148.255.255
3310.149.0.0/2110.149.0.1 – 10.149.7.25410.149.7.255
3410.149.8.0/2110.149.8.1 – 10.149.15.25410.149.15.255
3510.149.16.0/2110.149.16.1 – 10.149.23.25410.149.23.255
3610.149.24.0/2110.149.24.1 – 10.149.31.25410.149.31.255
3710.149.32.0/2110.149.32.1 – 10.149.39.25410.149.39.255
3810.149.40.0/2110.149.40.1 – 10.149.47.25410.149.47.255
3910.149.48.0/2110.149.48.1 – 10.149.55.25410.149.55.255
4010.149.56.0/2110.149.56.1 – 10.149.63.25410.149.63.255
4110.149.64.0/2110.149.64.1 – 10.149.71.25410.149.71.255
4210.149.72.0/2110.149.72.1 – 10.149.79.25410.149.79.255
4310.149.80.0/2110.149.80.1 – 10.149.87.25410.149.87.255
4410.149.88.0/2110.149.88.1 – 10.149.95.25410.149.95.255
4510.149.96.0/2110.149.96.1 – 10.149.103.25410.149.103.255
4610.149.104.0/2110.149.104.1 – 10.149.111.25410.149.111.255
4710.149.112.0/2110.149.112.1 – 10.149.119.25410.149.119.255
4810.149.120.0/2110.149.120.1 – 10.149.127.25410.149.127.255
4910.149.128.0/2110.149.128.1 – 10.149.135.25410.149.135.255
5010.149.136.0/2110.149.136.1 – 10.149.143.25410.149.143.255
5110.149.144.0/2110.149.144.1 – 10.149.151.25410.149.151.255
5210.149.152.0/2110.149.152.1 – 10.149.159.25410.149.159.255
5310.149.160.0/2110.149.160.1 – 10.149.167.25410.149.167.255
5410.149.168.0/2110.149.168.1 – 10.149.175.25410.149.175.255
5510.149.176.0/2110.149.176.1 – 10.149.183.25410.149.183.255
5610.149.184.0/2110.149.184.1 – 10.149.191.25410.149.191.255
5710.149.192.0/2110.149.192.1 – 10.149.199.25410.149.199.255
5810.149.200.0/2110.149.200.1 – 10.149.207.25410.149.207.255
5910.149.208.0/2110.149.208.1 – 10.149.215.25410.149.215.255
6010.149.216.0/2110.149.216.1 – 10.149.223.25410.149.223.255
6110.149.224.0/2110.149.224.1 – 10.149.231.25410.149.231.255
6210.149.232.0/2110.149.232.1 – 10.149.239.25410.149.239.255
6310.149.240.0/2110.149.240.1 – 10.149.247.25410.149.247.255
6410.149.248.0/2110.149.248.1 – 10.149.255.25410.149.255.255
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 →