ip
ipku.in

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)10.128.0.0/9
network10.128.0.0/9
broadcast10.255.255.255
first host10.128.0.1
last host10.255.255.254
subnet mask255.128.0.0
wildcard0.127.255.255
addresses8,388,608
usable hosts8,388,606
classA
ipcalc 10.128.0.0/9
address00001010.10000000.00000000.00000000
subnet mask11111111.10000000.00000000.00000000
network00001010.10000000.00000000.00000000
broadcast00001010.11111111.11111111.11111111
green = network part, grey = host part
hex0x0a800000
decimal176160768
reverse dns0.0.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:0

/9 split into /15 · 64 subnets

close ×
#networkhost rangebroadcast
110.128.0.0/1510.128.0.1 – 10.129.255.25410.129.255.255
210.130.0.0/1510.130.0.1 – 10.131.255.25410.131.255.255
310.132.0.0/1510.132.0.1 – 10.133.255.25410.133.255.255
410.134.0.0/1510.134.0.1 – 10.135.255.25410.135.255.255
510.136.0.0/1510.136.0.1 – 10.137.255.25410.137.255.255
610.138.0.0/1510.138.0.1 – 10.139.255.25410.139.255.255
710.140.0.0/1510.140.0.1 – 10.141.255.25410.141.255.255
810.142.0.0/1510.142.0.1 – 10.143.255.25410.143.255.255
910.144.0.0/1510.144.0.1 – 10.145.255.25410.145.255.255
1010.146.0.0/1510.146.0.1 – 10.147.255.25410.147.255.255
1110.148.0.0/1510.148.0.1 – 10.149.255.25410.149.255.255
1210.150.0.0/1510.150.0.1 – 10.151.255.25410.151.255.255
1310.152.0.0/1510.152.0.1 – 10.153.255.25410.153.255.255
1410.154.0.0/1510.154.0.1 – 10.155.255.25410.155.255.255
1510.156.0.0/1510.156.0.1 – 10.157.255.25410.157.255.255
1610.158.0.0/1510.158.0.1 – 10.159.255.25410.159.255.255
1710.160.0.0/1510.160.0.1 – 10.161.255.25410.161.255.255
1810.162.0.0/1510.162.0.1 – 10.163.255.25410.163.255.255
1910.164.0.0/1510.164.0.1 – 10.165.255.25410.165.255.255
2010.166.0.0/1510.166.0.1 – 10.167.255.25410.167.255.255
2110.168.0.0/1510.168.0.1 – 10.169.255.25410.169.255.255
2210.170.0.0/1510.170.0.1 – 10.171.255.25410.171.255.255
2310.172.0.0/1510.172.0.1 – 10.173.255.25410.173.255.255
2410.174.0.0/1510.174.0.1 – 10.175.255.25410.175.255.255
2510.176.0.0/1510.176.0.1 – 10.177.255.25410.177.255.255
2610.178.0.0/1510.178.0.1 – 10.179.255.25410.179.255.255
2710.180.0.0/1510.180.0.1 – 10.181.255.25410.181.255.255
2810.182.0.0/1510.182.0.1 – 10.183.255.25410.183.255.255
2910.184.0.0/1510.184.0.1 – 10.185.255.25410.185.255.255
3010.186.0.0/1510.186.0.1 – 10.187.255.25410.187.255.255
3110.188.0.0/1510.188.0.1 – 10.189.255.25410.189.255.255
3210.190.0.0/1510.190.0.1 – 10.191.255.25410.191.255.255
3310.192.0.0/1510.192.0.1 – 10.193.255.25410.193.255.255
3410.194.0.0/1510.194.0.1 – 10.195.255.25410.195.255.255
3510.196.0.0/1510.196.0.1 – 10.197.255.25410.197.255.255
3610.198.0.0/1510.198.0.1 – 10.199.255.25410.199.255.255
3710.200.0.0/1510.200.0.1 – 10.201.255.25410.201.255.255
3810.202.0.0/1510.202.0.1 – 10.203.255.25410.203.255.255
3910.204.0.0/1510.204.0.1 – 10.205.255.25410.205.255.255
4010.206.0.0/1510.206.0.1 – 10.207.255.25410.207.255.255
4110.208.0.0/1510.208.0.1 – 10.209.255.25410.209.255.255
4210.210.0.0/1510.210.0.1 – 10.211.255.25410.211.255.255
4310.212.0.0/1510.212.0.1 – 10.213.255.25410.213.255.255
4410.214.0.0/1510.214.0.1 – 10.215.255.25410.215.255.255
4510.216.0.0/1510.216.0.1 – 10.217.255.25410.217.255.255
4610.218.0.0/1510.218.0.1 – 10.219.255.25410.219.255.255
4710.220.0.0/1510.220.0.1 – 10.221.255.25410.221.255.255
4810.222.0.0/1510.222.0.1 – 10.223.255.25410.223.255.255
4910.224.0.0/1510.224.0.1 – 10.225.255.25410.225.255.255
5010.226.0.0/1510.226.0.1 – 10.227.255.25410.227.255.255
5110.228.0.0/1510.228.0.1 – 10.229.255.25410.229.255.255
5210.230.0.0/1510.230.0.1 – 10.231.255.25410.231.255.255
5310.232.0.0/1510.232.0.1 – 10.233.255.25410.233.255.255
5410.234.0.0/1510.234.0.1 – 10.235.255.25410.235.255.255
5510.236.0.0/1510.236.0.1 – 10.237.255.25410.237.255.255
5610.238.0.0/1510.238.0.1 – 10.239.255.25410.239.255.255
5710.240.0.0/1510.240.0.1 – 10.241.255.25410.241.255.255
5810.242.0.0/1510.242.0.1 – 10.243.255.25410.243.255.255
5910.244.0.0/1510.244.0.1 – 10.245.255.25410.245.255.255
6010.246.0.0/1510.246.0.1 – 10.247.255.25410.247.255.255
6110.248.0.0/1510.248.0.1 – 10.249.255.25410.249.255.255
6210.250.0.0/1510.250.0.1 – 10.251.255.25410.251.255.255
6310.252.0.0/1510.252.0.1 – 10.253.255.25410.253.255.255
6410.254.0.0/1510.254.0.1 – 10.255.255.25410.255.255.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /9
/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-
/9255.128.0.08,388,6088,388,6061
/10255.192.0.04,194,3044,194,3022 split →
/11255.224.0.02,097,1522,097,1504 split →
/12255.240.0.01,048,5761,048,5748 split →
/13255.248.0.0524,288524,28616 split →
/14255.252.0.0262,144262,14232 split →
/15255.254.0.0131,072131,07064 split →
/16255.255.0.065,53665,534128 split →
/17255.255.128.032,76832,766256 split →
/18255.255.192.016,38416,382512 split →
/19255.255.224.08,1928,1901,024 split →
/20255.255.240.04,0964,0942,048 split →
/21255.255.248.02,0482,0464,096 split →
/22255.255.252.01,0241,0228,192 split →
/23255.255.254.051251016,384 split →
/24255.255.255.025625432,768 split →
/25255.255.255.12812812665,536 split →
/26255.255.255.1926462131,072 split →
/27255.255.255.2243230262,144 split →
/28255.255.255.2401614524,288 split →
/29255.255.255.248861,048,576 split →
/30255.255.255.252422,097,152 split →
/31255.255.255.254224,194,304 split →
/32255.255.255.255118,388,608 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 →