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)10.7.168.0/21
network10.7.168.0/21
broadcast10.7.175.255
first host10.7.168.1
last host10.7.175.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.7.168.0/21
address00001010.00000111.10101000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000111.10101000.00000000
broadcast00001010.00000111.10101111.11111111
green = network part, grey = host part
hex0x0a07a800
decimal168273920
reverse dns0.168.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:a800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.7.168.0/2810.7.168.1 – 10.7.168.1410.7.168.15
210.7.168.16/2810.7.168.17 – 10.7.168.3010.7.168.31
310.7.168.32/2810.7.168.33 – 10.7.168.4610.7.168.47
410.7.168.48/2810.7.168.49 – 10.7.168.6210.7.168.63
510.7.168.64/2810.7.168.65 – 10.7.168.7810.7.168.79
610.7.168.80/2810.7.168.81 – 10.7.168.9410.7.168.95
710.7.168.96/2810.7.168.97 – 10.7.168.11010.7.168.111
810.7.168.112/2810.7.168.113 – 10.7.168.12610.7.168.127
910.7.168.128/2810.7.168.129 – 10.7.168.14210.7.168.143
1010.7.168.144/2810.7.168.145 – 10.7.168.15810.7.168.159
1110.7.168.160/2810.7.168.161 – 10.7.168.17410.7.168.175
1210.7.168.176/2810.7.168.177 – 10.7.168.19010.7.168.191
1310.7.168.192/2810.7.168.193 – 10.7.168.20610.7.168.207
1410.7.168.208/2810.7.168.209 – 10.7.168.22210.7.168.223
1510.7.168.224/2810.7.168.225 – 10.7.168.23810.7.168.239
1610.7.168.240/2810.7.168.241 – 10.7.168.25410.7.168.255
1710.7.169.0/2810.7.169.1 – 10.7.169.1410.7.169.15
1810.7.169.16/2810.7.169.17 – 10.7.169.3010.7.169.31
1910.7.169.32/2810.7.169.33 – 10.7.169.4610.7.169.47
2010.7.169.48/2810.7.169.49 – 10.7.169.6210.7.169.63
2110.7.169.64/2810.7.169.65 – 10.7.169.7810.7.169.79
2210.7.169.80/2810.7.169.81 – 10.7.169.9410.7.169.95
2310.7.169.96/2810.7.169.97 – 10.7.169.11010.7.169.111
2410.7.169.112/2810.7.169.113 – 10.7.169.12610.7.169.127
2510.7.169.128/2810.7.169.129 – 10.7.169.14210.7.169.143
2610.7.169.144/2810.7.169.145 – 10.7.169.15810.7.169.159
2710.7.169.160/2810.7.169.161 – 10.7.169.17410.7.169.175
2810.7.169.176/2810.7.169.177 – 10.7.169.19010.7.169.191
2910.7.169.192/2810.7.169.193 – 10.7.169.20610.7.169.207
3010.7.169.208/2810.7.169.209 – 10.7.169.22210.7.169.223
3110.7.169.224/2810.7.169.225 – 10.7.169.23810.7.169.239
3210.7.169.240/2810.7.169.241 – 10.7.169.25410.7.169.255
3310.7.170.0/2810.7.170.1 – 10.7.170.1410.7.170.15
3410.7.170.16/2810.7.170.17 – 10.7.170.3010.7.170.31
3510.7.170.32/2810.7.170.33 – 10.7.170.4610.7.170.47
3610.7.170.48/2810.7.170.49 – 10.7.170.6210.7.170.63
3710.7.170.64/2810.7.170.65 – 10.7.170.7810.7.170.79
3810.7.170.80/2810.7.170.81 – 10.7.170.9410.7.170.95
3910.7.170.96/2810.7.170.97 – 10.7.170.11010.7.170.111
4010.7.170.112/2810.7.170.113 – 10.7.170.12610.7.170.127
4110.7.170.128/2810.7.170.129 – 10.7.170.14210.7.170.143
4210.7.170.144/2810.7.170.145 – 10.7.170.15810.7.170.159
4310.7.170.160/2810.7.170.161 – 10.7.170.17410.7.170.175
4410.7.170.176/2810.7.170.177 – 10.7.170.19010.7.170.191
4510.7.170.192/2810.7.170.193 – 10.7.170.20610.7.170.207
4610.7.170.208/2810.7.170.209 – 10.7.170.22210.7.170.223
4710.7.170.224/2810.7.170.225 – 10.7.170.23810.7.170.239
4810.7.170.240/2810.7.170.241 – 10.7.170.25410.7.170.255
4910.7.171.0/2810.7.171.1 – 10.7.171.1410.7.171.15
5010.7.171.16/2810.7.171.17 – 10.7.171.3010.7.171.31
5110.7.171.32/2810.7.171.33 – 10.7.171.4610.7.171.47
5210.7.171.48/2810.7.171.49 – 10.7.171.6210.7.171.63
5310.7.171.64/2810.7.171.65 – 10.7.171.7810.7.171.79
5410.7.171.80/2810.7.171.81 – 10.7.171.9410.7.171.95
5510.7.171.96/2810.7.171.97 – 10.7.171.11010.7.171.111
5610.7.171.112/2810.7.171.113 – 10.7.171.12610.7.171.127
5710.7.171.128/2810.7.171.129 – 10.7.171.14210.7.171.143
5810.7.171.144/2810.7.171.145 – 10.7.171.15810.7.171.159
5910.7.171.160/2810.7.171.161 – 10.7.171.17410.7.171.175
6010.7.171.176/2810.7.171.177 – 10.7.171.19010.7.171.191
6110.7.171.192/2810.7.171.193 – 10.7.171.20610.7.171.207
6210.7.171.208/2810.7.171.209 – 10.7.171.22210.7.171.223
6310.7.171.224/2810.7.171.225 – 10.7.171.23810.7.171.239
6410.7.171.240/2810.7.171.241 – 10.7.171.25410.7.171.255
6510.7.172.0/2810.7.172.1 – 10.7.172.1410.7.172.15
6610.7.172.16/2810.7.172.17 – 10.7.172.3010.7.172.31
6710.7.172.32/2810.7.172.33 – 10.7.172.4610.7.172.47
6810.7.172.48/2810.7.172.49 – 10.7.172.6210.7.172.63
6910.7.172.64/2810.7.172.65 – 10.7.172.7810.7.172.79
7010.7.172.80/2810.7.172.81 – 10.7.172.9410.7.172.95
7110.7.172.96/2810.7.172.97 – 10.7.172.11010.7.172.111
7210.7.172.112/2810.7.172.113 – 10.7.172.12610.7.172.127
7310.7.172.128/2810.7.172.129 – 10.7.172.14210.7.172.143
7410.7.172.144/2810.7.172.145 – 10.7.172.15810.7.172.159
7510.7.172.160/2810.7.172.161 – 10.7.172.17410.7.172.175
7610.7.172.176/2810.7.172.177 – 10.7.172.19010.7.172.191
7710.7.172.192/2810.7.172.193 – 10.7.172.20610.7.172.207
7810.7.172.208/2810.7.172.209 – 10.7.172.22210.7.172.223
7910.7.172.224/2810.7.172.225 – 10.7.172.23810.7.172.239
8010.7.172.240/2810.7.172.241 – 10.7.172.25410.7.172.255
8110.7.173.0/2810.7.173.1 – 10.7.173.1410.7.173.15
8210.7.173.16/2810.7.173.17 – 10.7.173.3010.7.173.31
8310.7.173.32/2810.7.173.33 – 10.7.173.4610.7.173.47
8410.7.173.48/2810.7.173.49 – 10.7.173.6210.7.173.63
8510.7.173.64/2810.7.173.65 – 10.7.173.7810.7.173.79
8610.7.173.80/2810.7.173.81 – 10.7.173.9410.7.173.95
8710.7.173.96/2810.7.173.97 – 10.7.173.11010.7.173.111
8810.7.173.112/2810.7.173.113 – 10.7.173.12610.7.173.127
8910.7.173.128/2810.7.173.129 – 10.7.173.14210.7.173.143
9010.7.173.144/2810.7.173.145 – 10.7.173.15810.7.173.159
9110.7.173.160/2810.7.173.161 – 10.7.173.17410.7.173.175
9210.7.173.176/2810.7.173.177 – 10.7.173.19010.7.173.191
9310.7.173.192/2810.7.173.193 – 10.7.173.20610.7.173.207
9410.7.173.208/2810.7.173.209 – 10.7.173.22210.7.173.223
9510.7.173.224/2810.7.173.225 – 10.7.173.23810.7.173.239
9610.7.173.240/2810.7.173.241 – 10.7.173.25410.7.173.255
9710.7.174.0/2810.7.174.1 – 10.7.174.1410.7.174.15
9810.7.174.16/2810.7.174.17 – 10.7.174.3010.7.174.31
9910.7.174.32/2810.7.174.33 – 10.7.174.4610.7.174.47
10010.7.174.48/2810.7.174.49 – 10.7.174.6210.7.174.63
10110.7.174.64/2810.7.174.65 – 10.7.174.7810.7.174.79
10210.7.174.80/2810.7.174.81 – 10.7.174.9410.7.174.95
10310.7.174.96/2810.7.174.97 – 10.7.174.11010.7.174.111
10410.7.174.112/2810.7.174.113 – 10.7.174.12610.7.174.127
10510.7.174.128/2810.7.174.129 – 10.7.174.14210.7.174.143
10610.7.174.144/2810.7.174.145 – 10.7.174.15810.7.174.159
10710.7.174.160/2810.7.174.161 – 10.7.174.17410.7.174.175
10810.7.174.176/2810.7.174.177 – 10.7.174.19010.7.174.191
10910.7.174.192/2810.7.174.193 – 10.7.174.20610.7.174.207
11010.7.174.208/2810.7.174.209 – 10.7.174.22210.7.174.223
11110.7.174.224/2810.7.174.225 – 10.7.174.23810.7.174.239
11210.7.174.240/2810.7.174.241 – 10.7.174.25410.7.174.255
11310.7.175.0/2810.7.175.1 – 10.7.175.1410.7.175.15
11410.7.175.16/2810.7.175.17 – 10.7.175.3010.7.175.31
11510.7.175.32/2810.7.175.33 – 10.7.175.4610.7.175.47
11610.7.175.48/2810.7.175.49 – 10.7.175.6210.7.175.63
11710.7.175.64/2810.7.175.65 – 10.7.175.7810.7.175.79
11810.7.175.80/2810.7.175.81 – 10.7.175.9410.7.175.95
11910.7.175.96/2810.7.175.97 – 10.7.175.11010.7.175.111
12010.7.175.112/2810.7.175.113 – 10.7.175.12610.7.175.127
12110.7.175.128/2810.7.175.129 – 10.7.175.14210.7.175.143
12210.7.175.144/2810.7.175.145 – 10.7.175.15810.7.175.159
12310.7.175.160/2810.7.175.161 – 10.7.175.17410.7.175.175
12410.7.175.176/2810.7.175.177 – 10.7.175.19010.7.175.191
12510.7.175.192/2810.7.175.193 – 10.7.175.20610.7.175.207
12610.7.175.208/2810.7.175.209 – 10.7.175.22210.7.175.223
12710.7.175.224/2810.7.175.225 – 10.7.175.23810.7.175.239
12810.7.175.240/2810.7.175.241 – 10.7.175.25410.7.175.255
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 →