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)10.78.152.0/21
network10.78.152.0/21
broadcast10.78.159.255
first host10.78.152.1
last host10.78.159.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.78.152.0/21
address00001010.01001110.10011000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.01001110.10011000.00000000
broadcast00001010.01001110.10011111.11111111
green = network part, grey = host part
hex0x0a4e9800
decimal172922880
reverse dns0.152.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:9800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.78.152.0/2810.78.152.1 – 10.78.152.1410.78.152.15
210.78.152.16/2810.78.152.17 – 10.78.152.3010.78.152.31
310.78.152.32/2810.78.152.33 – 10.78.152.4610.78.152.47
410.78.152.48/2810.78.152.49 – 10.78.152.6210.78.152.63
510.78.152.64/2810.78.152.65 – 10.78.152.7810.78.152.79
610.78.152.80/2810.78.152.81 – 10.78.152.9410.78.152.95
710.78.152.96/2810.78.152.97 – 10.78.152.11010.78.152.111
810.78.152.112/2810.78.152.113 – 10.78.152.12610.78.152.127
910.78.152.128/2810.78.152.129 – 10.78.152.14210.78.152.143
1010.78.152.144/2810.78.152.145 – 10.78.152.15810.78.152.159
1110.78.152.160/2810.78.152.161 – 10.78.152.17410.78.152.175
1210.78.152.176/2810.78.152.177 – 10.78.152.19010.78.152.191
1310.78.152.192/2810.78.152.193 – 10.78.152.20610.78.152.207
1410.78.152.208/2810.78.152.209 – 10.78.152.22210.78.152.223
1510.78.152.224/2810.78.152.225 – 10.78.152.23810.78.152.239
1610.78.152.240/2810.78.152.241 – 10.78.152.25410.78.152.255
1710.78.153.0/2810.78.153.1 – 10.78.153.1410.78.153.15
1810.78.153.16/2810.78.153.17 – 10.78.153.3010.78.153.31
1910.78.153.32/2810.78.153.33 – 10.78.153.4610.78.153.47
2010.78.153.48/2810.78.153.49 – 10.78.153.6210.78.153.63
2110.78.153.64/2810.78.153.65 – 10.78.153.7810.78.153.79
2210.78.153.80/2810.78.153.81 – 10.78.153.9410.78.153.95
2310.78.153.96/2810.78.153.97 – 10.78.153.11010.78.153.111
2410.78.153.112/2810.78.153.113 – 10.78.153.12610.78.153.127
2510.78.153.128/2810.78.153.129 – 10.78.153.14210.78.153.143
2610.78.153.144/2810.78.153.145 – 10.78.153.15810.78.153.159
2710.78.153.160/2810.78.153.161 – 10.78.153.17410.78.153.175
2810.78.153.176/2810.78.153.177 – 10.78.153.19010.78.153.191
2910.78.153.192/2810.78.153.193 – 10.78.153.20610.78.153.207
3010.78.153.208/2810.78.153.209 – 10.78.153.22210.78.153.223
3110.78.153.224/2810.78.153.225 – 10.78.153.23810.78.153.239
3210.78.153.240/2810.78.153.241 – 10.78.153.25410.78.153.255
3310.78.154.0/2810.78.154.1 – 10.78.154.1410.78.154.15
3410.78.154.16/2810.78.154.17 – 10.78.154.3010.78.154.31
3510.78.154.32/2810.78.154.33 – 10.78.154.4610.78.154.47
3610.78.154.48/2810.78.154.49 – 10.78.154.6210.78.154.63
3710.78.154.64/2810.78.154.65 – 10.78.154.7810.78.154.79
3810.78.154.80/2810.78.154.81 – 10.78.154.9410.78.154.95
3910.78.154.96/2810.78.154.97 – 10.78.154.11010.78.154.111
4010.78.154.112/2810.78.154.113 – 10.78.154.12610.78.154.127
4110.78.154.128/2810.78.154.129 – 10.78.154.14210.78.154.143
4210.78.154.144/2810.78.154.145 – 10.78.154.15810.78.154.159
4310.78.154.160/2810.78.154.161 – 10.78.154.17410.78.154.175
4410.78.154.176/2810.78.154.177 – 10.78.154.19010.78.154.191
4510.78.154.192/2810.78.154.193 – 10.78.154.20610.78.154.207
4610.78.154.208/2810.78.154.209 – 10.78.154.22210.78.154.223
4710.78.154.224/2810.78.154.225 – 10.78.154.23810.78.154.239
4810.78.154.240/2810.78.154.241 – 10.78.154.25410.78.154.255
4910.78.155.0/2810.78.155.1 – 10.78.155.1410.78.155.15
5010.78.155.16/2810.78.155.17 – 10.78.155.3010.78.155.31
5110.78.155.32/2810.78.155.33 – 10.78.155.4610.78.155.47
5210.78.155.48/2810.78.155.49 – 10.78.155.6210.78.155.63
5310.78.155.64/2810.78.155.65 – 10.78.155.7810.78.155.79
5410.78.155.80/2810.78.155.81 – 10.78.155.9410.78.155.95
5510.78.155.96/2810.78.155.97 – 10.78.155.11010.78.155.111
5610.78.155.112/2810.78.155.113 – 10.78.155.12610.78.155.127
5710.78.155.128/2810.78.155.129 – 10.78.155.14210.78.155.143
5810.78.155.144/2810.78.155.145 – 10.78.155.15810.78.155.159
5910.78.155.160/2810.78.155.161 – 10.78.155.17410.78.155.175
6010.78.155.176/2810.78.155.177 – 10.78.155.19010.78.155.191
6110.78.155.192/2810.78.155.193 – 10.78.155.20610.78.155.207
6210.78.155.208/2810.78.155.209 – 10.78.155.22210.78.155.223
6310.78.155.224/2810.78.155.225 – 10.78.155.23810.78.155.239
6410.78.155.240/2810.78.155.241 – 10.78.155.25410.78.155.255
6510.78.156.0/2810.78.156.1 – 10.78.156.1410.78.156.15
6610.78.156.16/2810.78.156.17 – 10.78.156.3010.78.156.31
6710.78.156.32/2810.78.156.33 – 10.78.156.4610.78.156.47
6810.78.156.48/2810.78.156.49 – 10.78.156.6210.78.156.63
6910.78.156.64/2810.78.156.65 – 10.78.156.7810.78.156.79
7010.78.156.80/2810.78.156.81 – 10.78.156.9410.78.156.95
7110.78.156.96/2810.78.156.97 – 10.78.156.11010.78.156.111
7210.78.156.112/2810.78.156.113 – 10.78.156.12610.78.156.127
7310.78.156.128/2810.78.156.129 – 10.78.156.14210.78.156.143
7410.78.156.144/2810.78.156.145 – 10.78.156.15810.78.156.159
7510.78.156.160/2810.78.156.161 – 10.78.156.17410.78.156.175
7610.78.156.176/2810.78.156.177 – 10.78.156.19010.78.156.191
7710.78.156.192/2810.78.156.193 – 10.78.156.20610.78.156.207
7810.78.156.208/2810.78.156.209 – 10.78.156.22210.78.156.223
7910.78.156.224/2810.78.156.225 – 10.78.156.23810.78.156.239
8010.78.156.240/2810.78.156.241 – 10.78.156.25410.78.156.255
8110.78.157.0/2810.78.157.1 – 10.78.157.1410.78.157.15
8210.78.157.16/2810.78.157.17 – 10.78.157.3010.78.157.31
8310.78.157.32/2810.78.157.33 – 10.78.157.4610.78.157.47
8410.78.157.48/2810.78.157.49 – 10.78.157.6210.78.157.63
8510.78.157.64/2810.78.157.65 – 10.78.157.7810.78.157.79
8610.78.157.80/2810.78.157.81 – 10.78.157.9410.78.157.95
8710.78.157.96/2810.78.157.97 – 10.78.157.11010.78.157.111
8810.78.157.112/2810.78.157.113 – 10.78.157.12610.78.157.127
8910.78.157.128/2810.78.157.129 – 10.78.157.14210.78.157.143
9010.78.157.144/2810.78.157.145 – 10.78.157.15810.78.157.159
9110.78.157.160/2810.78.157.161 – 10.78.157.17410.78.157.175
9210.78.157.176/2810.78.157.177 – 10.78.157.19010.78.157.191
9310.78.157.192/2810.78.157.193 – 10.78.157.20610.78.157.207
9410.78.157.208/2810.78.157.209 – 10.78.157.22210.78.157.223
9510.78.157.224/2810.78.157.225 – 10.78.157.23810.78.157.239
9610.78.157.240/2810.78.157.241 – 10.78.157.25410.78.157.255
9710.78.158.0/2810.78.158.1 – 10.78.158.1410.78.158.15
9810.78.158.16/2810.78.158.17 – 10.78.158.3010.78.158.31
9910.78.158.32/2810.78.158.33 – 10.78.158.4610.78.158.47
10010.78.158.48/2810.78.158.49 – 10.78.158.6210.78.158.63
10110.78.158.64/2810.78.158.65 – 10.78.158.7810.78.158.79
10210.78.158.80/2810.78.158.81 – 10.78.158.9410.78.158.95
10310.78.158.96/2810.78.158.97 – 10.78.158.11010.78.158.111
10410.78.158.112/2810.78.158.113 – 10.78.158.12610.78.158.127
10510.78.158.128/2810.78.158.129 – 10.78.158.14210.78.158.143
10610.78.158.144/2810.78.158.145 – 10.78.158.15810.78.158.159
10710.78.158.160/2810.78.158.161 – 10.78.158.17410.78.158.175
10810.78.158.176/2810.78.158.177 – 10.78.158.19010.78.158.191
10910.78.158.192/2810.78.158.193 – 10.78.158.20610.78.158.207
11010.78.158.208/2810.78.158.209 – 10.78.158.22210.78.158.223
11110.78.158.224/2810.78.158.225 – 10.78.158.23810.78.158.239
11210.78.158.240/2810.78.158.241 – 10.78.158.25410.78.158.255
11310.78.159.0/2810.78.159.1 – 10.78.159.1410.78.159.15
11410.78.159.16/2810.78.159.17 – 10.78.159.3010.78.159.31
11510.78.159.32/2810.78.159.33 – 10.78.159.4610.78.159.47
11610.78.159.48/2810.78.159.49 – 10.78.159.6210.78.159.63
11710.78.159.64/2810.78.159.65 – 10.78.159.7810.78.159.79
11810.78.159.80/2810.78.159.81 – 10.78.159.9410.78.159.95
11910.78.159.96/2810.78.159.97 – 10.78.159.11010.78.159.111
12010.78.159.112/2810.78.159.113 – 10.78.159.12610.78.159.127
12110.78.159.128/2810.78.159.129 – 10.78.159.14210.78.159.143
12210.78.159.144/2810.78.159.145 – 10.78.159.15810.78.159.159
12310.78.159.160/2810.78.159.161 – 10.78.159.17410.78.159.175
12410.78.159.176/2810.78.159.177 – 10.78.159.19010.78.159.191
12510.78.159.192/2810.78.159.193 – 10.78.159.20610.78.159.207
12610.78.159.208/2810.78.159.209 – 10.78.159.22210.78.159.223
12710.78.159.224/2810.78.159.225 – 10.78.159.23810.78.159.239
12810.78.159.240/2810.78.159.241 – 10.78.159.25410.78.159.255
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 →