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)10.7.88.0/21
network10.7.88.0/21
broadcast10.7.95.255
first host10.7.88.1
last host10.7.95.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.7.88.0/21
address00001010.00000111.01011000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000111.01011000.00000000
broadcast00001010.00000111.01011111.11111111
green = network part, grey = host part
hex0x0a075800
decimal168253440
reverse dns0.88.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:5800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.7.88.0/2810.7.88.1 – 10.7.88.1410.7.88.15
210.7.88.16/2810.7.88.17 – 10.7.88.3010.7.88.31
310.7.88.32/2810.7.88.33 – 10.7.88.4610.7.88.47
410.7.88.48/2810.7.88.49 – 10.7.88.6210.7.88.63
510.7.88.64/2810.7.88.65 – 10.7.88.7810.7.88.79
610.7.88.80/2810.7.88.81 – 10.7.88.9410.7.88.95
710.7.88.96/2810.7.88.97 – 10.7.88.11010.7.88.111
810.7.88.112/2810.7.88.113 – 10.7.88.12610.7.88.127
910.7.88.128/2810.7.88.129 – 10.7.88.14210.7.88.143
1010.7.88.144/2810.7.88.145 – 10.7.88.15810.7.88.159
1110.7.88.160/2810.7.88.161 – 10.7.88.17410.7.88.175
1210.7.88.176/2810.7.88.177 – 10.7.88.19010.7.88.191
1310.7.88.192/2810.7.88.193 – 10.7.88.20610.7.88.207
1410.7.88.208/2810.7.88.209 – 10.7.88.22210.7.88.223
1510.7.88.224/2810.7.88.225 – 10.7.88.23810.7.88.239
1610.7.88.240/2810.7.88.241 – 10.7.88.25410.7.88.255
1710.7.89.0/2810.7.89.1 – 10.7.89.1410.7.89.15
1810.7.89.16/2810.7.89.17 – 10.7.89.3010.7.89.31
1910.7.89.32/2810.7.89.33 – 10.7.89.4610.7.89.47
2010.7.89.48/2810.7.89.49 – 10.7.89.6210.7.89.63
2110.7.89.64/2810.7.89.65 – 10.7.89.7810.7.89.79
2210.7.89.80/2810.7.89.81 – 10.7.89.9410.7.89.95
2310.7.89.96/2810.7.89.97 – 10.7.89.11010.7.89.111
2410.7.89.112/2810.7.89.113 – 10.7.89.12610.7.89.127
2510.7.89.128/2810.7.89.129 – 10.7.89.14210.7.89.143
2610.7.89.144/2810.7.89.145 – 10.7.89.15810.7.89.159
2710.7.89.160/2810.7.89.161 – 10.7.89.17410.7.89.175
2810.7.89.176/2810.7.89.177 – 10.7.89.19010.7.89.191
2910.7.89.192/2810.7.89.193 – 10.7.89.20610.7.89.207
3010.7.89.208/2810.7.89.209 – 10.7.89.22210.7.89.223
3110.7.89.224/2810.7.89.225 – 10.7.89.23810.7.89.239
3210.7.89.240/2810.7.89.241 – 10.7.89.25410.7.89.255
3310.7.90.0/2810.7.90.1 – 10.7.90.1410.7.90.15
3410.7.90.16/2810.7.90.17 – 10.7.90.3010.7.90.31
3510.7.90.32/2810.7.90.33 – 10.7.90.4610.7.90.47
3610.7.90.48/2810.7.90.49 – 10.7.90.6210.7.90.63
3710.7.90.64/2810.7.90.65 – 10.7.90.7810.7.90.79
3810.7.90.80/2810.7.90.81 – 10.7.90.9410.7.90.95
3910.7.90.96/2810.7.90.97 – 10.7.90.11010.7.90.111
4010.7.90.112/2810.7.90.113 – 10.7.90.12610.7.90.127
4110.7.90.128/2810.7.90.129 – 10.7.90.14210.7.90.143
4210.7.90.144/2810.7.90.145 – 10.7.90.15810.7.90.159
4310.7.90.160/2810.7.90.161 – 10.7.90.17410.7.90.175
4410.7.90.176/2810.7.90.177 – 10.7.90.19010.7.90.191
4510.7.90.192/2810.7.90.193 – 10.7.90.20610.7.90.207
4610.7.90.208/2810.7.90.209 – 10.7.90.22210.7.90.223
4710.7.90.224/2810.7.90.225 – 10.7.90.23810.7.90.239
4810.7.90.240/2810.7.90.241 – 10.7.90.25410.7.90.255
4910.7.91.0/2810.7.91.1 – 10.7.91.1410.7.91.15
5010.7.91.16/2810.7.91.17 – 10.7.91.3010.7.91.31
5110.7.91.32/2810.7.91.33 – 10.7.91.4610.7.91.47
5210.7.91.48/2810.7.91.49 – 10.7.91.6210.7.91.63
5310.7.91.64/2810.7.91.65 – 10.7.91.7810.7.91.79
5410.7.91.80/2810.7.91.81 – 10.7.91.9410.7.91.95
5510.7.91.96/2810.7.91.97 – 10.7.91.11010.7.91.111
5610.7.91.112/2810.7.91.113 – 10.7.91.12610.7.91.127
5710.7.91.128/2810.7.91.129 – 10.7.91.14210.7.91.143
5810.7.91.144/2810.7.91.145 – 10.7.91.15810.7.91.159
5910.7.91.160/2810.7.91.161 – 10.7.91.17410.7.91.175
6010.7.91.176/2810.7.91.177 – 10.7.91.19010.7.91.191
6110.7.91.192/2810.7.91.193 – 10.7.91.20610.7.91.207
6210.7.91.208/2810.7.91.209 – 10.7.91.22210.7.91.223
6310.7.91.224/2810.7.91.225 – 10.7.91.23810.7.91.239
6410.7.91.240/2810.7.91.241 – 10.7.91.25410.7.91.255
6510.7.92.0/2810.7.92.1 – 10.7.92.1410.7.92.15
6610.7.92.16/2810.7.92.17 – 10.7.92.3010.7.92.31
6710.7.92.32/2810.7.92.33 – 10.7.92.4610.7.92.47
6810.7.92.48/2810.7.92.49 – 10.7.92.6210.7.92.63
6910.7.92.64/2810.7.92.65 – 10.7.92.7810.7.92.79
7010.7.92.80/2810.7.92.81 – 10.7.92.9410.7.92.95
7110.7.92.96/2810.7.92.97 – 10.7.92.11010.7.92.111
7210.7.92.112/2810.7.92.113 – 10.7.92.12610.7.92.127
7310.7.92.128/2810.7.92.129 – 10.7.92.14210.7.92.143
7410.7.92.144/2810.7.92.145 – 10.7.92.15810.7.92.159
7510.7.92.160/2810.7.92.161 – 10.7.92.17410.7.92.175
7610.7.92.176/2810.7.92.177 – 10.7.92.19010.7.92.191
7710.7.92.192/2810.7.92.193 – 10.7.92.20610.7.92.207
7810.7.92.208/2810.7.92.209 – 10.7.92.22210.7.92.223
7910.7.92.224/2810.7.92.225 – 10.7.92.23810.7.92.239
8010.7.92.240/2810.7.92.241 – 10.7.92.25410.7.92.255
8110.7.93.0/2810.7.93.1 – 10.7.93.1410.7.93.15
8210.7.93.16/2810.7.93.17 – 10.7.93.3010.7.93.31
8310.7.93.32/2810.7.93.33 – 10.7.93.4610.7.93.47
8410.7.93.48/2810.7.93.49 – 10.7.93.6210.7.93.63
8510.7.93.64/2810.7.93.65 – 10.7.93.7810.7.93.79
8610.7.93.80/2810.7.93.81 – 10.7.93.9410.7.93.95
8710.7.93.96/2810.7.93.97 – 10.7.93.11010.7.93.111
8810.7.93.112/2810.7.93.113 – 10.7.93.12610.7.93.127
8910.7.93.128/2810.7.93.129 – 10.7.93.14210.7.93.143
9010.7.93.144/2810.7.93.145 – 10.7.93.15810.7.93.159
9110.7.93.160/2810.7.93.161 – 10.7.93.17410.7.93.175
9210.7.93.176/2810.7.93.177 – 10.7.93.19010.7.93.191
9310.7.93.192/2810.7.93.193 – 10.7.93.20610.7.93.207
9410.7.93.208/2810.7.93.209 – 10.7.93.22210.7.93.223
9510.7.93.224/2810.7.93.225 – 10.7.93.23810.7.93.239
9610.7.93.240/2810.7.93.241 – 10.7.93.25410.7.93.255
9710.7.94.0/2810.7.94.1 – 10.7.94.1410.7.94.15
9810.7.94.16/2810.7.94.17 – 10.7.94.3010.7.94.31
9910.7.94.32/2810.7.94.33 – 10.7.94.4610.7.94.47
10010.7.94.48/2810.7.94.49 – 10.7.94.6210.7.94.63
10110.7.94.64/2810.7.94.65 – 10.7.94.7810.7.94.79
10210.7.94.80/2810.7.94.81 – 10.7.94.9410.7.94.95
10310.7.94.96/2810.7.94.97 – 10.7.94.11010.7.94.111
10410.7.94.112/2810.7.94.113 – 10.7.94.12610.7.94.127
10510.7.94.128/2810.7.94.129 – 10.7.94.14210.7.94.143
10610.7.94.144/2810.7.94.145 – 10.7.94.15810.7.94.159
10710.7.94.160/2810.7.94.161 – 10.7.94.17410.7.94.175
10810.7.94.176/2810.7.94.177 – 10.7.94.19010.7.94.191
10910.7.94.192/2810.7.94.193 – 10.7.94.20610.7.94.207
11010.7.94.208/2810.7.94.209 – 10.7.94.22210.7.94.223
11110.7.94.224/2810.7.94.225 – 10.7.94.23810.7.94.239
11210.7.94.240/2810.7.94.241 – 10.7.94.25410.7.94.255
11310.7.95.0/2810.7.95.1 – 10.7.95.1410.7.95.15
11410.7.95.16/2810.7.95.17 – 10.7.95.3010.7.95.31
11510.7.95.32/2810.7.95.33 – 10.7.95.4610.7.95.47
11610.7.95.48/2810.7.95.49 – 10.7.95.6210.7.95.63
11710.7.95.64/2810.7.95.65 – 10.7.95.7810.7.95.79
11810.7.95.80/2810.7.95.81 – 10.7.95.9410.7.95.95
11910.7.95.96/2810.7.95.97 – 10.7.95.11010.7.95.111
12010.7.95.112/2810.7.95.113 – 10.7.95.12610.7.95.127
12110.7.95.128/2810.7.95.129 – 10.7.95.14210.7.95.143
12210.7.95.144/2810.7.95.145 – 10.7.95.15810.7.95.159
12310.7.95.160/2810.7.95.161 – 10.7.95.17410.7.95.175
12410.7.95.176/2810.7.95.177 – 10.7.95.19010.7.95.191
12510.7.95.192/2810.7.95.193 – 10.7.95.20610.7.95.207
12610.7.95.208/2810.7.95.209 – 10.7.95.22210.7.95.223
12710.7.95.224/2810.7.95.225 – 10.7.95.23810.7.95.239
12810.7.95.240/2810.7.95.241 – 10.7.95.25410.7.95.255
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 →