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)10.21.192.0/19
network10.21.192.0/19
broadcast10.21.223.255
first host10.21.192.1
last host10.21.223.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.21.192.0/19
address00001010.00010101.11000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010101.11000000.00000000
broadcast00001010.00010101.11011111.11111111
green = network part, grey = host part
hex0x0a15c000
decimal169197568
reverse dns0.192.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:c000

/19 split into /26 · 128 subnets

close ×
#networkhost rangebroadcast
110.21.192.0/2610.21.192.1 – 10.21.192.6210.21.192.63
210.21.192.64/2610.21.192.65 – 10.21.192.12610.21.192.127
310.21.192.128/2610.21.192.129 – 10.21.192.19010.21.192.191
410.21.192.192/2610.21.192.193 – 10.21.192.25410.21.192.255
510.21.193.0/2610.21.193.1 – 10.21.193.6210.21.193.63
610.21.193.64/2610.21.193.65 – 10.21.193.12610.21.193.127
710.21.193.128/2610.21.193.129 – 10.21.193.19010.21.193.191
810.21.193.192/2610.21.193.193 – 10.21.193.25410.21.193.255
910.21.194.0/2610.21.194.1 – 10.21.194.6210.21.194.63
1010.21.194.64/2610.21.194.65 – 10.21.194.12610.21.194.127
1110.21.194.128/2610.21.194.129 – 10.21.194.19010.21.194.191
1210.21.194.192/2610.21.194.193 – 10.21.194.25410.21.194.255
1310.21.195.0/2610.21.195.1 – 10.21.195.6210.21.195.63
1410.21.195.64/2610.21.195.65 – 10.21.195.12610.21.195.127
1510.21.195.128/2610.21.195.129 – 10.21.195.19010.21.195.191
1610.21.195.192/2610.21.195.193 – 10.21.195.25410.21.195.255
1710.21.196.0/2610.21.196.1 – 10.21.196.6210.21.196.63
1810.21.196.64/2610.21.196.65 – 10.21.196.12610.21.196.127
1910.21.196.128/2610.21.196.129 – 10.21.196.19010.21.196.191
2010.21.196.192/2610.21.196.193 – 10.21.196.25410.21.196.255
2110.21.197.0/2610.21.197.1 – 10.21.197.6210.21.197.63
2210.21.197.64/2610.21.197.65 – 10.21.197.12610.21.197.127
2310.21.197.128/2610.21.197.129 – 10.21.197.19010.21.197.191
2410.21.197.192/2610.21.197.193 – 10.21.197.25410.21.197.255
2510.21.198.0/2610.21.198.1 – 10.21.198.6210.21.198.63
2610.21.198.64/2610.21.198.65 – 10.21.198.12610.21.198.127
2710.21.198.128/2610.21.198.129 – 10.21.198.19010.21.198.191
2810.21.198.192/2610.21.198.193 – 10.21.198.25410.21.198.255
2910.21.199.0/2610.21.199.1 – 10.21.199.6210.21.199.63
3010.21.199.64/2610.21.199.65 – 10.21.199.12610.21.199.127
3110.21.199.128/2610.21.199.129 – 10.21.199.19010.21.199.191
3210.21.199.192/2610.21.199.193 – 10.21.199.25410.21.199.255
3310.21.200.0/2610.21.200.1 – 10.21.200.6210.21.200.63
3410.21.200.64/2610.21.200.65 – 10.21.200.12610.21.200.127
3510.21.200.128/2610.21.200.129 – 10.21.200.19010.21.200.191
3610.21.200.192/2610.21.200.193 – 10.21.200.25410.21.200.255
3710.21.201.0/2610.21.201.1 – 10.21.201.6210.21.201.63
3810.21.201.64/2610.21.201.65 – 10.21.201.12610.21.201.127
3910.21.201.128/2610.21.201.129 – 10.21.201.19010.21.201.191
4010.21.201.192/2610.21.201.193 – 10.21.201.25410.21.201.255
4110.21.202.0/2610.21.202.1 – 10.21.202.6210.21.202.63
4210.21.202.64/2610.21.202.65 – 10.21.202.12610.21.202.127
4310.21.202.128/2610.21.202.129 – 10.21.202.19010.21.202.191
4410.21.202.192/2610.21.202.193 – 10.21.202.25410.21.202.255
4510.21.203.0/2610.21.203.1 – 10.21.203.6210.21.203.63
4610.21.203.64/2610.21.203.65 – 10.21.203.12610.21.203.127
4710.21.203.128/2610.21.203.129 – 10.21.203.19010.21.203.191
4810.21.203.192/2610.21.203.193 – 10.21.203.25410.21.203.255
4910.21.204.0/2610.21.204.1 – 10.21.204.6210.21.204.63
5010.21.204.64/2610.21.204.65 – 10.21.204.12610.21.204.127
5110.21.204.128/2610.21.204.129 – 10.21.204.19010.21.204.191
5210.21.204.192/2610.21.204.193 – 10.21.204.25410.21.204.255
5310.21.205.0/2610.21.205.1 – 10.21.205.6210.21.205.63
5410.21.205.64/2610.21.205.65 – 10.21.205.12610.21.205.127
5510.21.205.128/2610.21.205.129 – 10.21.205.19010.21.205.191
5610.21.205.192/2610.21.205.193 – 10.21.205.25410.21.205.255
5710.21.206.0/2610.21.206.1 – 10.21.206.6210.21.206.63
5810.21.206.64/2610.21.206.65 – 10.21.206.12610.21.206.127
5910.21.206.128/2610.21.206.129 – 10.21.206.19010.21.206.191
6010.21.206.192/2610.21.206.193 – 10.21.206.25410.21.206.255
6110.21.207.0/2610.21.207.1 – 10.21.207.6210.21.207.63
6210.21.207.64/2610.21.207.65 – 10.21.207.12610.21.207.127
6310.21.207.128/2610.21.207.129 – 10.21.207.19010.21.207.191
6410.21.207.192/2610.21.207.193 – 10.21.207.25410.21.207.255
6510.21.208.0/2610.21.208.1 – 10.21.208.6210.21.208.63
6610.21.208.64/2610.21.208.65 – 10.21.208.12610.21.208.127
6710.21.208.128/2610.21.208.129 – 10.21.208.19010.21.208.191
6810.21.208.192/2610.21.208.193 – 10.21.208.25410.21.208.255
6910.21.209.0/2610.21.209.1 – 10.21.209.6210.21.209.63
7010.21.209.64/2610.21.209.65 – 10.21.209.12610.21.209.127
7110.21.209.128/2610.21.209.129 – 10.21.209.19010.21.209.191
7210.21.209.192/2610.21.209.193 – 10.21.209.25410.21.209.255
7310.21.210.0/2610.21.210.1 – 10.21.210.6210.21.210.63
7410.21.210.64/2610.21.210.65 – 10.21.210.12610.21.210.127
7510.21.210.128/2610.21.210.129 – 10.21.210.19010.21.210.191
7610.21.210.192/2610.21.210.193 – 10.21.210.25410.21.210.255
7710.21.211.0/2610.21.211.1 – 10.21.211.6210.21.211.63
7810.21.211.64/2610.21.211.65 – 10.21.211.12610.21.211.127
7910.21.211.128/2610.21.211.129 – 10.21.211.19010.21.211.191
8010.21.211.192/2610.21.211.193 – 10.21.211.25410.21.211.255
8110.21.212.0/2610.21.212.1 – 10.21.212.6210.21.212.63
8210.21.212.64/2610.21.212.65 – 10.21.212.12610.21.212.127
8310.21.212.128/2610.21.212.129 – 10.21.212.19010.21.212.191
8410.21.212.192/2610.21.212.193 – 10.21.212.25410.21.212.255
8510.21.213.0/2610.21.213.1 – 10.21.213.6210.21.213.63
8610.21.213.64/2610.21.213.65 – 10.21.213.12610.21.213.127
8710.21.213.128/2610.21.213.129 – 10.21.213.19010.21.213.191
8810.21.213.192/2610.21.213.193 – 10.21.213.25410.21.213.255
8910.21.214.0/2610.21.214.1 – 10.21.214.6210.21.214.63
9010.21.214.64/2610.21.214.65 – 10.21.214.12610.21.214.127
9110.21.214.128/2610.21.214.129 – 10.21.214.19010.21.214.191
9210.21.214.192/2610.21.214.193 – 10.21.214.25410.21.214.255
9310.21.215.0/2610.21.215.1 – 10.21.215.6210.21.215.63
9410.21.215.64/2610.21.215.65 – 10.21.215.12610.21.215.127
9510.21.215.128/2610.21.215.129 – 10.21.215.19010.21.215.191
9610.21.215.192/2610.21.215.193 – 10.21.215.25410.21.215.255
9710.21.216.0/2610.21.216.1 – 10.21.216.6210.21.216.63
9810.21.216.64/2610.21.216.65 – 10.21.216.12610.21.216.127
9910.21.216.128/2610.21.216.129 – 10.21.216.19010.21.216.191
10010.21.216.192/2610.21.216.193 – 10.21.216.25410.21.216.255
10110.21.217.0/2610.21.217.1 – 10.21.217.6210.21.217.63
10210.21.217.64/2610.21.217.65 – 10.21.217.12610.21.217.127
10310.21.217.128/2610.21.217.129 – 10.21.217.19010.21.217.191
10410.21.217.192/2610.21.217.193 – 10.21.217.25410.21.217.255
10510.21.218.0/2610.21.218.1 – 10.21.218.6210.21.218.63
10610.21.218.64/2610.21.218.65 – 10.21.218.12610.21.218.127
10710.21.218.128/2610.21.218.129 – 10.21.218.19010.21.218.191
10810.21.218.192/2610.21.218.193 – 10.21.218.25410.21.218.255
10910.21.219.0/2610.21.219.1 – 10.21.219.6210.21.219.63
11010.21.219.64/2610.21.219.65 – 10.21.219.12610.21.219.127
11110.21.219.128/2610.21.219.129 – 10.21.219.19010.21.219.191
11210.21.219.192/2610.21.219.193 – 10.21.219.25410.21.219.255
11310.21.220.0/2610.21.220.1 – 10.21.220.6210.21.220.63
11410.21.220.64/2610.21.220.65 – 10.21.220.12610.21.220.127
11510.21.220.128/2610.21.220.129 – 10.21.220.19010.21.220.191
11610.21.220.192/2610.21.220.193 – 10.21.220.25410.21.220.255
11710.21.221.0/2610.21.221.1 – 10.21.221.6210.21.221.63
11810.21.221.64/2610.21.221.65 – 10.21.221.12610.21.221.127
11910.21.221.128/2610.21.221.129 – 10.21.221.19010.21.221.191
12010.21.221.192/2610.21.221.193 – 10.21.221.25410.21.221.255
12110.21.222.0/2610.21.222.1 – 10.21.222.6210.21.222.63
12210.21.222.64/2610.21.222.65 – 10.21.222.12610.21.222.127
12310.21.222.128/2610.21.222.129 – 10.21.222.19010.21.222.191
12410.21.222.192/2610.21.222.193 – 10.21.222.25410.21.222.255
12510.21.223.0/2610.21.223.1 – 10.21.223.6210.21.223.63
12610.21.223.64/2610.21.223.65 – 10.21.223.12610.21.223.127
12710.21.223.128/2610.21.223.129 – 10.21.223.19010.21.223.191
12810.21.223.192/2610.21.223.193 – 10.21.223.25410.21.223.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /19
/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-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,1901
/20255.255.240.04,0964,0942 split →
/21255.255.248.02,0482,0464 split →
/22255.255.252.01,0241,0228 split →
/23255.255.254.051251016 split →
/24255.255.255.025625432 split →
/25255.255.255.12812812664 split →
/26255.255.255.1926462128 split →
/27255.255.255.2243230256 split →
/28255.255.255.2401614512 split →
/29255.255.255.248861,024 split →
/30255.255.255.252422,048 split →
/31255.255.255.254224,096 split →
/32255.255.255.255118,192 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 →