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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)10.180.0.0/15
network10.180.0.0/15
broadcast10.181.255.255
first host10.180.0.1
last host10.181.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.180.0.0/15
address00001010.10110100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10110100.00000000.00000000
broadcast00001010.10110101.11111111.11111111
green = network part, grey = host part
hex0x0ab40000
decimal179568640
reverse dns0.0.180.10.in-addr.arpa
ipv4-mapped::ffff:ab4:0

/15 split into /20 · 32 subnets

close ×
#networkhost rangebroadcast
110.180.0.0/2010.180.0.1 – 10.180.15.25410.180.15.255
210.180.16.0/2010.180.16.1 – 10.180.31.25410.180.31.255
310.180.32.0/2010.180.32.1 – 10.180.47.25410.180.47.255
410.180.48.0/2010.180.48.1 – 10.180.63.25410.180.63.255
510.180.64.0/2010.180.64.1 – 10.180.79.25410.180.79.255
610.180.80.0/2010.180.80.1 – 10.180.95.25410.180.95.255
710.180.96.0/2010.180.96.1 – 10.180.111.25410.180.111.255
810.180.112.0/2010.180.112.1 – 10.180.127.25410.180.127.255
910.180.128.0/2010.180.128.1 – 10.180.143.25410.180.143.255
1010.180.144.0/2010.180.144.1 – 10.180.159.25410.180.159.255
1110.180.160.0/2010.180.160.1 – 10.180.175.25410.180.175.255
1210.180.176.0/2010.180.176.1 – 10.180.191.25410.180.191.255
1310.180.192.0/2010.180.192.1 – 10.180.207.25410.180.207.255
1410.180.208.0/2010.180.208.1 – 10.180.223.25410.180.223.255
1510.180.224.0/2010.180.224.1 – 10.180.239.25410.180.239.255
1610.180.240.0/2010.180.240.1 – 10.180.255.25410.180.255.255
1710.181.0.0/2010.181.0.1 – 10.181.15.25410.181.15.255
1810.181.16.0/2010.181.16.1 – 10.181.31.25410.181.31.255
1910.181.32.0/2010.181.32.1 – 10.181.47.25410.181.47.255
2010.181.48.0/2010.181.48.1 – 10.181.63.25410.181.63.255
2110.181.64.0/2010.181.64.1 – 10.181.79.25410.181.79.255
2210.181.80.0/2010.181.80.1 – 10.181.95.25410.181.95.255
2310.181.96.0/2010.181.96.1 – 10.181.111.25410.181.111.255
2410.181.112.0/2010.181.112.1 – 10.181.127.25410.181.127.255
2510.181.128.0/2010.181.128.1 – 10.181.143.25410.181.143.255
2610.181.144.0/2010.181.144.1 – 10.181.159.25410.181.159.255
2710.181.160.0/2010.181.160.1 – 10.181.175.25410.181.175.255
2810.181.176.0/2010.181.176.1 – 10.181.191.25410.181.191.255
2910.181.192.0/2010.181.192.1 – 10.181.207.25410.181.207.255
3010.181.208.0/2010.181.208.1 – 10.181.223.25410.181.223.255
3110.181.224.0/2010.181.224.1 – 10.181.239.25410.181.239.255
3210.181.240.0/2010.181.240.1 – 10.181.255.25410.181.255.255
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 →