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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)10.146.0.0/15
network10.146.0.0/15
broadcast10.147.255.255
first host10.146.0.1
last host10.147.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.146.0.0/15
address00001010.10010010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10010010.00000000.00000000
broadcast00001010.10010011.11111111.11111111
green = network part, grey = host part
hex0x0a920000
decimal177340416
reverse dns0.0.146.10.in-addr.arpa
ipv4-mapped::ffff:a92:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.146.0.0/2110.146.0.1 – 10.146.7.25410.146.7.255
210.146.8.0/2110.146.8.1 – 10.146.15.25410.146.15.255
310.146.16.0/2110.146.16.1 – 10.146.23.25410.146.23.255
410.146.24.0/2110.146.24.1 – 10.146.31.25410.146.31.255
510.146.32.0/2110.146.32.1 – 10.146.39.25410.146.39.255
610.146.40.0/2110.146.40.1 – 10.146.47.25410.146.47.255
710.146.48.0/2110.146.48.1 – 10.146.55.25410.146.55.255
810.146.56.0/2110.146.56.1 – 10.146.63.25410.146.63.255
910.146.64.0/2110.146.64.1 – 10.146.71.25410.146.71.255
1010.146.72.0/2110.146.72.1 – 10.146.79.25410.146.79.255
1110.146.80.0/2110.146.80.1 – 10.146.87.25410.146.87.255
1210.146.88.0/2110.146.88.1 – 10.146.95.25410.146.95.255
1310.146.96.0/2110.146.96.1 – 10.146.103.25410.146.103.255
1410.146.104.0/2110.146.104.1 – 10.146.111.25410.146.111.255
1510.146.112.0/2110.146.112.1 – 10.146.119.25410.146.119.255
1610.146.120.0/2110.146.120.1 – 10.146.127.25410.146.127.255
1710.146.128.0/2110.146.128.1 – 10.146.135.25410.146.135.255
1810.146.136.0/2110.146.136.1 – 10.146.143.25410.146.143.255
1910.146.144.0/2110.146.144.1 – 10.146.151.25410.146.151.255
2010.146.152.0/2110.146.152.1 – 10.146.159.25410.146.159.255
2110.146.160.0/2110.146.160.1 – 10.146.167.25410.146.167.255
2210.146.168.0/2110.146.168.1 – 10.146.175.25410.146.175.255
2310.146.176.0/2110.146.176.1 – 10.146.183.25410.146.183.255
2410.146.184.0/2110.146.184.1 – 10.146.191.25410.146.191.255
2510.146.192.0/2110.146.192.1 – 10.146.199.25410.146.199.255
2610.146.200.0/2110.146.200.1 – 10.146.207.25410.146.207.255
2710.146.208.0/2110.146.208.1 – 10.146.215.25410.146.215.255
2810.146.216.0/2110.146.216.1 – 10.146.223.25410.146.223.255
2910.146.224.0/2110.146.224.1 – 10.146.231.25410.146.231.255
3010.146.232.0/2110.146.232.1 – 10.146.239.25410.146.239.255
3110.146.240.0/2110.146.240.1 – 10.146.247.25410.146.247.255
3210.146.248.0/2110.146.248.1 – 10.146.255.25410.146.255.255
3310.147.0.0/2110.147.0.1 – 10.147.7.25410.147.7.255
3410.147.8.0/2110.147.8.1 – 10.147.15.25410.147.15.255
3510.147.16.0/2110.147.16.1 – 10.147.23.25410.147.23.255
3610.147.24.0/2110.147.24.1 – 10.147.31.25410.147.31.255
3710.147.32.0/2110.147.32.1 – 10.147.39.25410.147.39.255
3810.147.40.0/2110.147.40.1 – 10.147.47.25410.147.47.255
3910.147.48.0/2110.147.48.1 – 10.147.55.25410.147.55.255
4010.147.56.0/2110.147.56.1 – 10.147.63.25410.147.63.255
4110.147.64.0/2110.147.64.1 – 10.147.71.25410.147.71.255
4210.147.72.0/2110.147.72.1 – 10.147.79.25410.147.79.255
4310.147.80.0/2110.147.80.1 – 10.147.87.25410.147.87.255
4410.147.88.0/2110.147.88.1 – 10.147.95.25410.147.95.255
4510.147.96.0/2110.147.96.1 – 10.147.103.25410.147.103.255
4610.147.104.0/2110.147.104.1 – 10.147.111.25410.147.111.255
4710.147.112.0/2110.147.112.1 – 10.147.119.25410.147.119.255
4810.147.120.0/2110.147.120.1 – 10.147.127.25410.147.127.255
4910.147.128.0/2110.147.128.1 – 10.147.135.25410.147.135.255
5010.147.136.0/2110.147.136.1 – 10.147.143.25410.147.143.255
5110.147.144.0/2110.147.144.1 – 10.147.151.25410.147.151.255
5210.147.152.0/2110.147.152.1 – 10.147.159.25410.147.159.255
5310.147.160.0/2110.147.160.1 – 10.147.167.25410.147.167.255
5410.147.168.0/2110.147.168.1 – 10.147.175.25410.147.175.255
5510.147.176.0/2110.147.176.1 – 10.147.183.25410.147.183.255
5610.147.184.0/2110.147.184.1 – 10.147.191.25410.147.191.255
5710.147.192.0/2110.147.192.1 – 10.147.199.25410.147.199.255
5810.147.200.0/2110.147.200.1 – 10.147.207.25410.147.207.255
5910.147.208.0/2110.147.208.1 – 10.147.215.25410.147.215.255
6010.147.216.0/2110.147.216.1 – 10.147.223.25410.147.223.255
6110.147.224.0/2110.147.224.1 – 10.147.231.25410.147.231.255
6210.147.232.0/2110.147.232.1 – 10.147.239.25410.147.239.255
6310.147.240.0/2110.147.240.1 – 10.147.247.25410.147.247.255
6410.147.248.0/2110.147.248.1 – 10.147.255.25410.147.255.255
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 →