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)10.0.176.0/21
network10.0.176.0/21
broadcast10.0.183.255
first host10.0.176.1
last host10.0.183.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.0.176.0/21
address00001010.00000000.10110000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000000.10110000.00000000
broadcast00001010.00000000.10110111.11111111
green = network part, grey = host part
hex0x0a00b000
decimal167817216
reverse dns0.176.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:b000

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.176.0/2810.0.176.1 – 10.0.176.1410.0.176.15
210.0.176.16/2810.0.176.17 – 10.0.176.3010.0.176.31
310.0.176.32/2810.0.176.33 – 10.0.176.4610.0.176.47
410.0.176.48/2810.0.176.49 – 10.0.176.6210.0.176.63
510.0.176.64/2810.0.176.65 – 10.0.176.7810.0.176.79
610.0.176.80/2810.0.176.81 – 10.0.176.9410.0.176.95
710.0.176.96/2810.0.176.97 – 10.0.176.11010.0.176.111
810.0.176.112/2810.0.176.113 – 10.0.176.12610.0.176.127
910.0.176.128/2810.0.176.129 – 10.0.176.14210.0.176.143
1010.0.176.144/2810.0.176.145 – 10.0.176.15810.0.176.159
1110.0.176.160/2810.0.176.161 – 10.0.176.17410.0.176.175
1210.0.176.176/2810.0.176.177 – 10.0.176.19010.0.176.191
1310.0.176.192/2810.0.176.193 – 10.0.176.20610.0.176.207
1410.0.176.208/2810.0.176.209 – 10.0.176.22210.0.176.223
1510.0.176.224/2810.0.176.225 – 10.0.176.23810.0.176.239
1610.0.176.240/2810.0.176.241 – 10.0.176.25410.0.176.255
1710.0.177.0/2810.0.177.1 – 10.0.177.1410.0.177.15
1810.0.177.16/2810.0.177.17 – 10.0.177.3010.0.177.31
1910.0.177.32/2810.0.177.33 – 10.0.177.4610.0.177.47
2010.0.177.48/2810.0.177.49 – 10.0.177.6210.0.177.63
2110.0.177.64/2810.0.177.65 – 10.0.177.7810.0.177.79
2210.0.177.80/2810.0.177.81 – 10.0.177.9410.0.177.95
2310.0.177.96/2810.0.177.97 – 10.0.177.11010.0.177.111
2410.0.177.112/2810.0.177.113 – 10.0.177.12610.0.177.127
2510.0.177.128/2810.0.177.129 – 10.0.177.14210.0.177.143
2610.0.177.144/2810.0.177.145 – 10.0.177.15810.0.177.159
2710.0.177.160/2810.0.177.161 – 10.0.177.17410.0.177.175
2810.0.177.176/2810.0.177.177 – 10.0.177.19010.0.177.191
2910.0.177.192/2810.0.177.193 – 10.0.177.20610.0.177.207
3010.0.177.208/2810.0.177.209 – 10.0.177.22210.0.177.223
3110.0.177.224/2810.0.177.225 – 10.0.177.23810.0.177.239
3210.0.177.240/2810.0.177.241 – 10.0.177.25410.0.177.255
3310.0.178.0/2810.0.178.1 – 10.0.178.1410.0.178.15
3410.0.178.16/2810.0.178.17 – 10.0.178.3010.0.178.31
3510.0.178.32/2810.0.178.33 – 10.0.178.4610.0.178.47
3610.0.178.48/2810.0.178.49 – 10.0.178.6210.0.178.63
3710.0.178.64/2810.0.178.65 – 10.0.178.7810.0.178.79
3810.0.178.80/2810.0.178.81 – 10.0.178.9410.0.178.95
3910.0.178.96/2810.0.178.97 – 10.0.178.11010.0.178.111
4010.0.178.112/2810.0.178.113 – 10.0.178.12610.0.178.127
4110.0.178.128/2810.0.178.129 – 10.0.178.14210.0.178.143
4210.0.178.144/2810.0.178.145 – 10.0.178.15810.0.178.159
4310.0.178.160/2810.0.178.161 – 10.0.178.17410.0.178.175
4410.0.178.176/2810.0.178.177 – 10.0.178.19010.0.178.191
4510.0.178.192/2810.0.178.193 – 10.0.178.20610.0.178.207
4610.0.178.208/2810.0.178.209 – 10.0.178.22210.0.178.223
4710.0.178.224/2810.0.178.225 – 10.0.178.23810.0.178.239
4810.0.178.240/2810.0.178.241 – 10.0.178.25410.0.178.255
4910.0.179.0/2810.0.179.1 – 10.0.179.1410.0.179.15
5010.0.179.16/2810.0.179.17 – 10.0.179.3010.0.179.31
5110.0.179.32/2810.0.179.33 – 10.0.179.4610.0.179.47
5210.0.179.48/2810.0.179.49 – 10.0.179.6210.0.179.63
5310.0.179.64/2810.0.179.65 – 10.0.179.7810.0.179.79
5410.0.179.80/2810.0.179.81 – 10.0.179.9410.0.179.95
5510.0.179.96/2810.0.179.97 – 10.0.179.11010.0.179.111
5610.0.179.112/2810.0.179.113 – 10.0.179.12610.0.179.127
5710.0.179.128/2810.0.179.129 – 10.0.179.14210.0.179.143
5810.0.179.144/2810.0.179.145 – 10.0.179.15810.0.179.159
5910.0.179.160/2810.0.179.161 – 10.0.179.17410.0.179.175
6010.0.179.176/2810.0.179.177 – 10.0.179.19010.0.179.191
6110.0.179.192/2810.0.179.193 – 10.0.179.20610.0.179.207
6210.0.179.208/2810.0.179.209 – 10.0.179.22210.0.179.223
6310.0.179.224/2810.0.179.225 – 10.0.179.23810.0.179.239
6410.0.179.240/2810.0.179.241 – 10.0.179.25410.0.179.255
6510.0.180.0/2810.0.180.1 – 10.0.180.1410.0.180.15
6610.0.180.16/2810.0.180.17 – 10.0.180.3010.0.180.31
6710.0.180.32/2810.0.180.33 – 10.0.180.4610.0.180.47
6810.0.180.48/2810.0.180.49 – 10.0.180.6210.0.180.63
6910.0.180.64/2810.0.180.65 – 10.0.180.7810.0.180.79
7010.0.180.80/2810.0.180.81 – 10.0.180.9410.0.180.95
7110.0.180.96/2810.0.180.97 – 10.0.180.11010.0.180.111
7210.0.180.112/2810.0.180.113 – 10.0.180.12610.0.180.127
7310.0.180.128/2810.0.180.129 – 10.0.180.14210.0.180.143
7410.0.180.144/2810.0.180.145 – 10.0.180.15810.0.180.159
7510.0.180.160/2810.0.180.161 – 10.0.180.17410.0.180.175
7610.0.180.176/2810.0.180.177 – 10.0.180.19010.0.180.191
7710.0.180.192/2810.0.180.193 – 10.0.180.20610.0.180.207
7810.0.180.208/2810.0.180.209 – 10.0.180.22210.0.180.223
7910.0.180.224/2810.0.180.225 – 10.0.180.23810.0.180.239
8010.0.180.240/2810.0.180.241 – 10.0.180.25410.0.180.255
8110.0.181.0/2810.0.181.1 – 10.0.181.1410.0.181.15
8210.0.181.16/2810.0.181.17 – 10.0.181.3010.0.181.31
8310.0.181.32/2810.0.181.33 – 10.0.181.4610.0.181.47
8410.0.181.48/2810.0.181.49 – 10.0.181.6210.0.181.63
8510.0.181.64/2810.0.181.65 – 10.0.181.7810.0.181.79
8610.0.181.80/2810.0.181.81 – 10.0.181.9410.0.181.95
8710.0.181.96/2810.0.181.97 – 10.0.181.11010.0.181.111
8810.0.181.112/2810.0.181.113 – 10.0.181.12610.0.181.127
8910.0.181.128/2810.0.181.129 – 10.0.181.14210.0.181.143
9010.0.181.144/2810.0.181.145 – 10.0.181.15810.0.181.159
9110.0.181.160/2810.0.181.161 – 10.0.181.17410.0.181.175
9210.0.181.176/2810.0.181.177 – 10.0.181.19010.0.181.191
9310.0.181.192/2810.0.181.193 – 10.0.181.20610.0.181.207
9410.0.181.208/2810.0.181.209 – 10.0.181.22210.0.181.223
9510.0.181.224/2810.0.181.225 – 10.0.181.23810.0.181.239
9610.0.181.240/2810.0.181.241 – 10.0.181.25410.0.181.255
9710.0.182.0/2810.0.182.1 – 10.0.182.1410.0.182.15
9810.0.182.16/2810.0.182.17 – 10.0.182.3010.0.182.31
9910.0.182.32/2810.0.182.33 – 10.0.182.4610.0.182.47
10010.0.182.48/2810.0.182.49 – 10.0.182.6210.0.182.63
10110.0.182.64/2810.0.182.65 – 10.0.182.7810.0.182.79
10210.0.182.80/2810.0.182.81 – 10.0.182.9410.0.182.95
10310.0.182.96/2810.0.182.97 – 10.0.182.11010.0.182.111
10410.0.182.112/2810.0.182.113 – 10.0.182.12610.0.182.127
10510.0.182.128/2810.0.182.129 – 10.0.182.14210.0.182.143
10610.0.182.144/2810.0.182.145 – 10.0.182.15810.0.182.159
10710.0.182.160/2810.0.182.161 – 10.0.182.17410.0.182.175
10810.0.182.176/2810.0.182.177 – 10.0.182.19010.0.182.191
10910.0.182.192/2810.0.182.193 – 10.0.182.20610.0.182.207
11010.0.182.208/2810.0.182.209 – 10.0.182.22210.0.182.223
11110.0.182.224/2810.0.182.225 – 10.0.182.23810.0.182.239
11210.0.182.240/2810.0.182.241 – 10.0.182.25410.0.182.255
11310.0.183.0/2810.0.183.1 – 10.0.183.1410.0.183.15
11410.0.183.16/2810.0.183.17 – 10.0.183.3010.0.183.31
11510.0.183.32/2810.0.183.33 – 10.0.183.4610.0.183.47
11610.0.183.48/2810.0.183.49 – 10.0.183.6210.0.183.63
11710.0.183.64/2810.0.183.65 – 10.0.183.7810.0.183.79
11810.0.183.80/2810.0.183.81 – 10.0.183.9410.0.183.95
11910.0.183.96/2810.0.183.97 – 10.0.183.11010.0.183.111
12010.0.183.112/2810.0.183.113 – 10.0.183.12610.0.183.127
12110.0.183.128/2810.0.183.129 – 10.0.183.14210.0.183.143
12210.0.183.144/2810.0.183.145 – 10.0.183.15810.0.183.159
12310.0.183.160/2810.0.183.161 – 10.0.183.17410.0.183.175
12410.0.183.176/2810.0.183.177 – 10.0.183.19010.0.183.191
12510.0.183.192/2810.0.183.193 – 10.0.183.20610.0.183.207
12610.0.183.208/2810.0.183.209 – 10.0.183.22210.0.183.223
12710.0.183.224/2810.0.183.225 – 10.0.183.23810.0.183.239
12810.0.183.240/2810.0.183.241 – 10.0.183.25410.0.183.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /21
/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-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,0461
/22255.255.252.01,0241,0222 split →
/23255.255.254.05125104 split →
/24255.255.255.02562548 split →
/25255.255.255.12812812616 split →
/26255.255.255.192646232 split →
/27255.255.255.224323064 split →
/28255.255.255.2401614128 split →
/29255.255.255.24886256 split →
/30255.255.255.25242512 split →
/31255.255.255.254221,024 split →
/32255.255.255.255112,048 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 →