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)10.12.128.0/17
network10.12.128.0/17
broadcast10.12.255.255
first host10.12.128.1
last host10.12.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.12.128.0/17
address00001010.00001100.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00001100.10000000.00000000
broadcast00001010.00001100.11111111.11111111
green = network part, grey = host part
hex0x0a0c8000
decimal168591360
reverse dns0.128.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:8000

/17 split into /24 · 128 subnets

close ×
#networkhost rangebroadcast
110.12.128.0/2410.12.128.1 – 10.12.128.25410.12.128.255
210.12.129.0/2410.12.129.1 – 10.12.129.25410.12.129.255
310.12.130.0/2410.12.130.1 – 10.12.130.25410.12.130.255
410.12.131.0/2410.12.131.1 – 10.12.131.25410.12.131.255
510.12.132.0/2410.12.132.1 – 10.12.132.25410.12.132.255
610.12.133.0/2410.12.133.1 – 10.12.133.25410.12.133.255
710.12.134.0/2410.12.134.1 – 10.12.134.25410.12.134.255
810.12.135.0/2410.12.135.1 – 10.12.135.25410.12.135.255
910.12.136.0/2410.12.136.1 – 10.12.136.25410.12.136.255
1010.12.137.0/2410.12.137.1 – 10.12.137.25410.12.137.255
1110.12.138.0/2410.12.138.1 – 10.12.138.25410.12.138.255
1210.12.139.0/2410.12.139.1 – 10.12.139.25410.12.139.255
1310.12.140.0/2410.12.140.1 – 10.12.140.25410.12.140.255
1410.12.141.0/2410.12.141.1 – 10.12.141.25410.12.141.255
1510.12.142.0/2410.12.142.1 – 10.12.142.25410.12.142.255
1610.12.143.0/2410.12.143.1 – 10.12.143.25410.12.143.255
1710.12.144.0/2410.12.144.1 – 10.12.144.25410.12.144.255
1810.12.145.0/2410.12.145.1 – 10.12.145.25410.12.145.255
1910.12.146.0/2410.12.146.1 – 10.12.146.25410.12.146.255
2010.12.147.0/2410.12.147.1 – 10.12.147.25410.12.147.255
2110.12.148.0/2410.12.148.1 – 10.12.148.25410.12.148.255
2210.12.149.0/2410.12.149.1 – 10.12.149.25410.12.149.255
2310.12.150.0/2410.12.150.1 – 10.12.150.25410.12.150.255
2410.12.151.0/2410.12.151.1 – 10.12.151.25410.12.151.255
2510.12.152.0/2410.12.152.1 – 10.12.152.25410.12.152.255
2610.12.153.0/2410.12.153.1 – 10.12.153.25410.12.153.255
2710.12.154.0/2410.12.154.1 – 10.12.154.25410.12.154.255
2810.12.155.0/2410.12.155.1 – 10.12.155.25410.12.155.255
2910.12.156.0/2410.12.156.1 – 10.12.156.25410.12.156.255
3010.12.157.0/2410.12.157.1 – 10.12.157.25410.12.157.255
3110.12.158.0/2410.12.158.1 – 10.12.158.25410.12.158.255
3210.12.159.0/2410.12.159.1 – 10.12.159.25410.12.159.255
3310.12.160.0/2410.12.160.1 – 10.12.160.25410.12.160.255
3410.12.161.0/2410.12.161.1 – 10.12.161.25410.12.161.255
3510.12.162.0/2410.12.162.1 – 10.12.162.25410.12.162.255
3610.12.163.0/2410.12.163.1 – 10.12.163.25410.12.163.255
3710.12.164.0/2410.12.164.1 – 10.12.164.25410.12.164.255
3810.12.165.0/2410.12.165.1 – 10.12.165.25410.12.165.255
3910.12.166.0/2410.12.166.1 – 10.12.166.25410.12.166.255
4010.12.167.0/2410.12.167.1 – 10.12.167.25410.12.167.255
4110.12.168.0/2410.12.168.1 – 10.12.168.25410.12.168.255
4210.12.169.0/2410.12.169.1 – 10.12.169.25410.12.169.255
4310.12.170.0/2410.12.170.1 – 10.12.170.25410.12.170.255
4410.12.171.0/2410.12.171.1 – 10.12.171.25410.12.171.255
4510.12.172.0/2410.12.172.1 – 10.12.172.25410.12.172.255
4610.12.173.0/2410.12.173.1 – 10.12.173.25410.12.173.255
4710.12.174.0/2410.12.174.1 – 10.12.174.25410.12.174.255
4810.12.175.0/2410.12.175.1 – 10.12.175.25410.12.175.255
4910.12.176.0/2410.12.176.1 – 10.12.176.25410.12.176.255
5010.12.177.0/2410.12.177.1 – 10.12.177.25410.12.177.255
5110.12.178.0/2410.12.178.1 – 10.12.178.25410.12.178.255
5210.12.179.0/2410.12.179.1 – 10.12.179.25410.12.179.255
5310.12.180.0/2410.12.180.1 – 10.12.180.25410.12.180.255
5410.12.181.0/2410.12.181.1 – 10.12.181.25410.12.181.255
5510.12.182.0/2410.12.182.1 – 10.12.182.25410.12.182.255
5610.12.183.0/2410.12.183.1 – 10.12.183.25410.12.183.255
5710.12.184.0/2410.12.184.1 – 10.12.184.25410.12.184.255
5810.12.185.0/2410.12.185.1 – 10.12.185.25410.12.185.255
5910.12.186.0/2410.12.186.1 – 10.12.186.25410.12.186.255
6010.12.187.0/2410.12.187.1 – 10.12.187.25410.12.187.255
6110.12.188.0/2410.12.188.1 – 10.12.188.25410.12.188.255
6210.12.189.0/2410.12.189.1 – 10.12.189.25410.12.189.255
6310.12.190.0/2410.12.190.1 – 10.12.190.25410.12.190.255
6410.12.191.0/2410.12.191.1 – 10.12.191.25410.12.191.255
6510.12.192.0/2410.12.192.1 – 10.12.192.25410.12.192.255
6610.12.193.0/2410.12.193.1 – 10.12.193.25410.12.193.255
6710.12.194.0/2410.12.194.1 – 10.12.194.25410.12.194.255
6810.12.195.0/2410.12.195.1 – 10.12.195.25410.12.195.255
6910.12.196.0/2410.12.196.1 – 10.12.196.25410.12.196.255
7010.12.197.0/2410.12.197.1 – 10.12.197.25410.12.197.255
7110.12.198.0/2410.12.198.1 – 10.12.198.25410.12.198.255
7210.12.199.0/2410.12.199.1 – 10.12.199.25410.12.199.255
7310.12.200.0/2410.12.200.1 – 10.12.200.25410.12.200.255
7410.12.201.0/2410.12.201.1 – 10.12.201.25410.12.201.255
7510.12.202.0/2410.12.202.1 – 10.12.202.25410.12.202.255
7610.12.203.0/2410.12.203.1 – 10.12.203.25410.12.203.255
7710.12.204.0/2410.12.204.1 – 10.12.204.25410.12.204.255
7810.12.205.0/2410.12.205.1 – 10.12.205.25410.12.205.255
7910.12.206.0/2410.12.206.1 – 10.12.206.25410.12.206.255
8010.12.207.0/2410.12.207.1 – 10.12.207.25410.12.207.255
8110.12.208.0/2410.12.208.1 – 10.12.208.25410.12.208.255
8210.12.209.0/2410.12.209.1 – 10.12.209.25410.12.209.255
8310.12.210.0/2410.12.210.1 – 10.12.210.25410.12.210.255
8410.12.211.0/2410.12.211.1 – 10.12.211.25410.12.211.255
8510.12.212.0/2410.12.212.1 – 10.12.212.25410.12.212.255
8610.12.213.0/2410.12.213.1 – 10.12.213.25410.12.213.255
8710.12.214.0/2410.12.214.1 – 10.12.214.25410.12.214.255
8810.12.215.0/2410.12.215.1 – 10.12.215.25410.12.215.255
8910.12.216.0/2410.12.216.1 – 10.12.216.25410.12.216.255
9010.12.217.0/2410.12.217.1 – 10.12.217.25410.12.217.255
9110.12.218.0/2410.12.218.1 – 10.12.218.25410.12.218.255
9210.12.219.0/2410.12.219.1 – 10.12.219.25410.12.219.255
9310.12.220.0/2410.12.220.1 – 10.12.220.25410.12.220.255
9410.12.221.0/2410.12.221.1 – 10.12.221.25410.12.221.255
9510.12.222.0/2410.12.222.1 – 10.12.222.25410.12.222.255
9610.12.223.0/2410.12.223.1 – 10.12.223.25410.12.223.255
9710.12.224.0/2410.12.224.1 – 10.12.224.25410.12.224.255
9810.12.225.0/2410.12.225.1 – 10.12.225.25410.12.225.255
9910.12.226.0/2410.12.226.1 – 10.12.226.25410.12.226.255
10010.12.227.0/2410.12.227.1 – 10.12.227.25410.12.227.255
10110.12.228.0/2410.12.228.1 – 10.12.228.25410.12.228.255
10210.12.229.0/2410.12.229.1 – 10.12.229.25410.12.229.255
10310.12.230.0/2410.12.230.1 – 10.12.230.25410.12.230.255
10410.12.231.0/2410.12.231.1 – 10.12.231.25410.12.231.255
10510.12.232.0/2410.12.232.1 – 10.12.232.25410.12.232.255
10610.12.233.0/2410.12.233.1 – 10.12.233.25410.12.233.255
10710.12.234.0/2410.12.234.1 – 10.12.234.25410.12.234.255
10810.12.235.0/2410.12.235.1 – 10.12.235.25410.12.235.255
10910.12.236.0/2410.12.236.1 – 10.12.236.25410.12.236.255
11010.12.237.0/2410.12.237.1 – 10.12.237.25410.12.237.255
11110.12.238.0/2410.12.238.1 – 10.12.238.25410.12.238.255
11210.12.239.0/2410.12.239.1 – 10.12.239.25410.12.239.255
11310.12.240.0/2410.12.240.1 – 10.12.240.25410.12.240.255
11410.12.241.0/2410.12.241.1 – 10.12.241.25410.12.241.255
11510.12.242.0/2410.12.242.1 – 10.12.242.25410.12.242.255
11610.12.243.0/2410.12.243.1 – 10.12.243.25410.12.243.255
11710.12.244.0/2410.12.244.1 – 10.12.244.25410.12.244.255
11810.12.245.0/2410.12.245.1 – 10.12.245.25410.12.245.255
11910.12.246.0/2410.12.246.1 – 10.12.246.25410.12.246.255
12010.12.247.0/2410.12.247.1 – 10.12.247.25410.12.247.255
12110.12.248.0/2410.12.248.1 – 10.12.248.25410.12.248.255
12210.12.249.0/2410.12.249.1 – 10.12.249.25410.12.249.255
12310.12.250.0/2410.12.250.1 – 10.12.250.25410.12.250.255
12410.12.251.0/2410.12.251.1 – 10.12.251.25410.12.251.255
12510.12.252.0/2410.12.252.1 – 10.12.252.25410.12.252.255
12610.12.253.0/2410.12.253.1 – 10.12.253.25410.12.253.255
12710.12.254.0/2410.12.254.1 – 10.12.254.25410.12.254.255
12810.12.255.0/2410.12.255.1 – 10.12.255.25410.12.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /17
/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-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,7661
/18255.255.192.016,38416,3822 split →
/19255.255.224.08,1928,1904 split →
/20255.255.240.04,0964,0948 split →
/21255.255.248.02,0482,04616 split →
/22255.255.252.01,0241,02232 split →
/23255.255.254.051251064 split →
/24255.255.255.0256254128 split →
/25255.255.255.128128126256 split →
/26255.255.255.1926462512 split →
/27255.255.255.22432301,024 split →
/28255.255.255.24016142,048 split →
/29255.255.255.248864,096 split →
/30255.255.255.252428,192 split →
/31255.255.255.2542216,384 split →
/32255.255.255.2551132,768 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 →