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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)10.100.0.0/15
network10.100.0.0/15
broadcast10.101.255.255
first host10.100.0.1
last host10.101.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.100.0.0/15
address00001010.01100100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01100100.00000000.00000000
broadcast00001010.01100101.11111111.11111111
green = network part, grey = host part
hex0x0a640000
decimal174325760
reverse dns0.0.100.10.in-addr.arpa
ipv4-mapped::ffff:a64:0

/15 split into /20 · 32 subnets

close ×
#networkhost rangebroadcast
110.100.0.0/2010.100.0.1 – 10.100.15.25410.100.15.255
210.100.16.0/2010.100.16.1 – 10.100.31.25410.100.31.255
310.100.32.0/2010.100.32.1 – 10.100.47.25410.100.47.255
410.100.48.0/2010.100.48.1 – 10.100.63.25410.100.63.255
510.100.64.0/2010.100.64.1 – 10.100.79.25410.100.79.255
610.100.80.0/2010.100.80.1 – 10.100.95.25410.100.95.255
710.100.96.0/2010.100.96.1 – 10.100.111.25410.100.111.255
810.100.112.0/2010.100.112.1 – 10.100.127.25410.100.127.255
910.100.128.0/2010.100.128.1 – 10.100.143.25410.100.143.255
1010.100.144.0/2010.100.144.1 – 10.100.159.25410.100.159.255
1110.100.160.0/2010.100.160.1 – 10.100.175.25410.100.175.255
1210.100.176.0/2010.100.176.1 – 10.100.191.25410.100.191.255
1310.100.192.0/2010.100.192.1 – 10.100.207.25410.100.207.255
1410.100.208.0/2010.100.208.1 – 10.100.223.25410.100.223.255
1510.100.224.0/2010.100.224.1 – 10.100.239.25410.100.239.255
1610.100.240.0/2010.100.240.1 – 10.100.255.25410.100.255.255
1710.101.0.0/2010.101.0.1 – 10.101.15.25410.101.15.255
1810.101.16.0/2010.101.16.1 – 10.101.31.25410.101.31.255
1910.101.32.0/2010.101.32.1 – 10.101.47.25410.101.47.255
2010.101.48.0/2010.101.48.1 – 10.101.63.25410.101.63.255
2110.101.64.0/2010.101.64.1 – 10.101.79.25410.101.79.255
2210.101.80.0/2010.101.80.1 – 10.101.95.25410.101.95.255
2310.101.96.0/2010.101.96.1 – 10.101.111.25410.101.111.255
2410.101.112.0/2010.101.112.1 – 10.101.127.25410.101.127.255
2510.101.128.0/2010.101.128.1 – 10.101.143.25410.101.143.255
2610.101.144.0/2010.101.144.1 – 10.101.159.25410.101.159.255
2710.101.160.0/2010.101.160.1 – 10.101.175.25410.101.175.255
2810.101.176.0/2010.101.176.1 – 10.101.191.25410.101.191.255
2910.101.192.0/2010.101.192.1 – 10.101.207.25410.101.207.255
3010.101.208.0/2010.101.208.1 – 10.101.223.25410.101.223.255
3110.101.224.0/2010.101.224.1 – 10.101.239.25410.101.239.255
3210.101.240.0/2010.101.240.1 – 10.101.255.25410.101.255.255
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 →