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)10.3.200.0/21
network10.3.200.0/21
broadcast10.3.207.255
first host10.3.200.1
last host10.3.207.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.3.200.0/21
address00001010.00000011.11001000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000011.11001000.00000000
broadcast00001010.00000011.11001111.11111111
green = network part, grey = host part
hex0x0a03c800
decimal168019968
reverse dns0.200.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:c800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.200.0/2810.3.200.1 – 10.3.200.1410.3.200.15
210.3.200.16/2810.3.200.17 – 10.3.200.3010.3.200.31
310.3.200.32/2810.3.200.33 – 10.3.200.4610.3.200.47
410.3.200.48/2810.3.200.49 – 10.3.200.6210.3.200.63
510.3.200.64/2810.3.200.65 – 10.3.200.7810.3.200.79
610.3.200.80/2810.3.200.81 – 10.3.200.9410.3.200.95
710.3.200.96/2810.3.200.97 – 10.3.200.11010.3.200.111
810.3.200.112/2810.3.200.113 – 10.3.200.12610.3.200.127
910.3.200.128/2810.3.200.129 – 10.3.200.14210.3.200.143
1010.3.200.144/2810.3.200.145 – 10.3.200.15810.3.200.159
1110.3.200.160/2810.3.200.161 – 10.3.200.17410.3.200.175
1210.3.200.176/2810.3.200.177 – 10.3.200.19010.3.200.191
1310.3.200.192/2810.3.200.193 – 10.3.200.20610.3.200.207
1410.3.200.208/2810.3.200.209 – 10.3.200.22210.3.200.223
1510.3.200.224/2810.3.200.225 – 10.3.200.23810.3.200.239
1610.3.200.240/2810.3.200.241 – 10.3.200.25410.3.200.255
1710.3.201.0/2810.3.201.1 – 10.3.201.1410.3.201.15
1810.3.201.16/2810.3.201.17 – 10.3.201.3010.3.201.31
1910.3.201.32/2810.3.201.33 – 10.3.201.4610.3.201.47
2010.3.201.48/2810.3.201.49 – 10.3.201.6210.3.201.63
2110.3.201.64/2810.3.201.65 – 10.3.201.7810.3.201.79
2210.3.201.80/2810.3.201.81 – 10.3.201.9410.3.201.95
2310.3.201.96/2810.3.201.97 – 10.3.201.11010.3.201.111
2410.3.201.112/2810.3.201.113 – 10.3.201.12610.3.201.127
2510.3.201.128/2810.3.201.129 – 10.3.201.14210.3.201.143
2610.3.201.144/2810.3.201.145 – 10.3.201.15810.3.201.159
2710.3.201.160/2810.3.201.161 – 10.3.201.17410.3.201.175
2810.3.201.176/2810.3.201.177 – 10.3.201.19010.3.201.191
2910.3.201.192/2810.3.201.193 – 10.3.201.20610.3.201.207
3010.3.201.208/2810.3.201.209 – 10.3.201.22210.3.201.223
3110.3.201.224/2810.3.201.225 – 10.3.201.23810.3.201.239
3210.3.201.240/2810.3.201.241 – 10.3.201.25410.3.201.255
3310.3.202.0/2810.3.202.1 – 10.3.202.1410.3.202.15
3410.3.202.16/2810.3.202.17 – 10.3.202.3010.3.202.31
3510.3.202.32/2810.3.202.33 – 10.3.202.4610.3.202.47
3610.3.202.48/2810.3.202.49 – 10.3.202.6210.3.202.63
3710.3.202.64/2810.3.202.65 – 10.3.202.7810.3.202.79
3810.3.202.80/2810.3.202.81 – 10.3.202.9410.3.202.95
3910.3.202.96/2810.3.202.97 – 10.3.202.11010.3.202.111
4010.3.202.112/2810.3.202.113 – 10.3.202.12610.3.202.127
4110.3.202.128/2810.3.202.129 – 10.3.202.14210.3.202.143
4210.3.202.144/2810.3.202.145 – 10.3.202.15810.3.202.159
4310.3.202.160/2810.3.202.161 – 10.3.202.17410.3.202.175
4410.3.202.176/2810.3.202.177 – 10.3.202.19010.3.202.191
4510.3.202.192/2810.3.202.193 – 10.3.202.20610.3.202.207
4610.3.202.208/2810.3.202.209 – 10.3.202.22210.3.202.223
4710.3.202.224/2810.3.202.225 – 10.3.202.23810.3.202.239
4810.3.202.240/2810.3.202.241 – 10.3.202.25410.3.202.255
4910.3.203.0/2810.3.203.1 – 10.3.203.1410.3.203.15
5010.3.203.16/2810.3.203.17 – 10.3.203.3010.3.203.31
5110.3.203.32/2810.3.203.33 – 10.3.203.4610.3.203.47
5210.3.203.48/2810.3.203.49 – 10.3.203.6210.3.203.63
5310.3.203.64/2810.3.203.65 – 10.3.203.7810.3.203.79
5410.3.203.80/2810.3.203.81 – 10.3.203.9410.3.203.95
5510.3.203.96/2810.3.203.97 – 10.3.203.11010.3.203.111
5610.3.203.112/2810.3.203.113 – 10.3.203.12610.3.203.127
5710.3.203.128/2810.3.203.129 – 10.3.203.14210.3.203.143
5810.3.203.144/2810.3.203.145 – 10.3.203.15810.3.203.159
5910.3.203.160/2810.3.203.161 – 10.3.203.17410.3.203.175
6010.3.203.176/2810.3.203.177 – 10.3.203.19010.3.203.191
6110.3.203.192/2810.3.203.193 – 10.3.203.20610.3.203.207
6210.3.203.208/2810.3.203.209 – 10.3.203.22210.3.203.223
6310.3.203.224/2810.3.203.225 – 10.3.203.23810.3.203.239
6410.3.203.240/2810.3.203.241 – 10.3.203.25410.3.203.255
6510.3.204.0/2810.3.204.1 – 10.3.204.1410.3.204.15
6610.3.204.16/2810.3.204.17 – 10.3.204.3010.3.204.31
6710.3.204.32/2810.3.204.33 – 10.3.204.4610.3.204.47
6810.3.204.48/2810.3.204.49 – 10.3.204.6210.3.204.63
6910.3.204.64/2810.3.204.65 – 10.3.204.7810.3.204.79
7010.3.204.80/2810.3.204.81 – 10.3.204.9410.3.204.95
7110.3.204.96/2810.3.204.97 – 10.3.204.11010.3.204.111
7210.3.204.112/2810.3.204.113 – 10.3.204.12610.3.204.127
7310.3.204.128/2810.3.204.129 – 10.3.204.14210.3.204.143
7410.3.204.144/2810.3.204.145 – 10.3.204.15810.3.204.159
7510.3.204.160/2810.3.204.161 – 10.3.204.17410.3.204.175
7610.3.204.176/2810.3.204.177 – 10.3.204.19010.3.204.191
7710.3.204.192/2810.3.204.193 – 10.3.204.20610.3.204.207
7810.3.204.208/2810.3.204.209 – 10.3.204.22210.3.204.223
7910.3.204.224/2810.3.204.225 – 10.3.204.23810.3.204.239
8010.3.204.240/2810.3.204.241 – 10.3.204.25410.3.204.255
8110.3.205.0/2810.3.205.1 – 10.3.205.1410.3.205.15
8210.3.205.16/2810.3.205.17 – 10.3.205.3010.3.205.31
8310.3.205.32/2810.3.205.33 – 10.3.205.4610.3.205.47
8410.3.205.48/2810.3.205.49 – 10.3.205.6210.3.205.63
8510.3.205.64/2810.3.205.65 – 10.3.205.7810.3.205.79
8610.3.205.80/2810.3.205.81 – 10.3.205.9410.3.205.95
8710.3.205.96/2810.3.205.97 – 10.3.205.11010.3.205.111
8810.3.205.112/2810.3.205.113 – 10.3.205.12610.3.205.127
8910.3.205.128/2810.3.205.129 – 10.3.205.14210.3.205.143
9010.3.205.144/2810.3.205.145 – 10.3.205.15810.3.205.159
9110.3.205.160/2810.3.205.161 – 10.3.205.17410.3.205.175
9210.3.205.176/2810.3.205.177 – 10.3.205.19010.3.205.191
9310.3.205.192/2810.3.205.193 – 10.3.205.20610.3.205.207
9410.3.205.208/2810.3.205.209 – 10.3.205.22210.3.205.223
9510.3.205.224/2810.3.205.225 – 10.3.205.23810.3.205.239
9610.3.205.240/2810.3.205.241 – 10.3.205.25410.3.205.255
9710.3.206.0/2810.3.206.1 – 10.3.206.1410.3.206.15
9810.3.206.16/2810.3.206.17 – 10.3.206.3010.3.206.31
9910.3.206.32/2810.3.206.33 – 10.3.206.4610.3.206.47
10010.3.206.48/2810.3.206.49 – 10.3.206.6210.3.206.63
10110.3.206.64/2810.3.206.65 – 10.3.206.7810.3.206.79
10210.3.206.80/2810.3.206.81 – 10.3.206.9410.3.206.95
10310.3.206.96/2810.3.206.97 – 10.3.206.11010.3.206.111
10410.3.206.112/2810.3.206.113 – 10.3.206.12610.3.206.127
10510.3.206.128/2810.3.206.129 – 10.3.206.14210.3.206.143
10610.3.206.144/2810.3.206.145 – 10.3.206.15810.3.206.159
10710.3.206.160/2810.3.206.161 – 10.3.206.17410.3.206.175
10810.3.206.176/2810.3.206.177 – 10.3.206.19010.3.206.191
10910.3.206.192/2810.3.206.193 – 10.3.206.20610.3.206.207
11010.3.206.208/2810.3.206.209 – 10.3.206.22210.3.206.223
11110.3.206.224/2810.3.206.225 – 10.3.206.23810.3.206.239
11210.3.206.240/2810.3.206.241 – 10.3.206.25410.3.206.255
11310.3.207.0/2810.3.207.1 – 10.3.207.1410.3.207.15
11410.3.207.16/2810.3.207.17 – 10.3.207.3010.3.207.31
11510.3.207.32/2810.3.207.33 – 10.3.207.4610.3.207.47
11610.3.207.48/2810.3.207.49 – 10.3.207.6210.3.207.63
11710.3.207.64/2810.3.207.65 – 10.3.207.7810.3.207.79
11810.3.207.80/2810.3.207.81 – 10.3.207.9410.3.207.95
11910.3.207.96/2810.3.207.97 – 10.3.207.11010.3.207.111
12010.3.207.112/2810.3.207.113 – 10.3.207.12610.3.207.127
12110.3.207.128/2810.3.207.129 – 10.3.207.14210.3.207.143
12210.3.207.144/2810.3.207.145 – 10.3.207.15810.3.207.159
12310.3.207.160/2810.3.207.161 – 10.3.207.17410.3.207.175
12410.3.207.176/2810.3.207.177 – 10.3.207.19010.3.207.191
12510.3.207.192/2810.3.207.193 – 10.3.207.20610.3.207.207
12610.3.207.208/2810.3.207.209 – 10.3.207.22210.3.207.223
12710.3.207.224/2810.3.207.225 – 10.3.207.23810.3.207.239
12810.3.207.240/2810.3.207.241 – 10.3.207.25410.3.207.255
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 →