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)10.4.192.0/20
network10.4.192.0/20
broadcast10.4.207.255
first host10.4.192.1
last host10.4.207.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.4.192.0/20
address00001010.00000100.11000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000100.11000000.00000000
broadcast00001010.00000100.11001111.11111111
green = network part, grey = host part
hex0x0a04c000
decimal168083456
reverse dns0.192.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:c000

/20 split into /27 · 128 subnets

close ×
#networkhost rangebroadcast
110.4.192.0/2710.4.192.1 – 10.4.192.3010.4.192.31
210.4.192.32/2710.4.192.33 – 10.4.192.6210.4.192.63
310.4.192.64/2710.4.192.65 – 10.4.192.9410.4.192.95
410.4.192.96/2710.4.192.97 – 10.4.192.12610.4.192.127
510.4.192.128/2710.4.192.129 – 10.4.192.15810.4.192.159
610.4.192.160/2710.4.192.161 – 10.4.192.19010.4.192.191
710.4.192.192/2710.4.192.193 – 10.4.192.22210.4.192.223
810.4.192.224/2710.4.192.225 – 10.4.192.25410.4.192.255
910.4.193.0/2710.4.193.1 – 10.4.193.3010.4.193.31
1010.4.193.32/2710.4.193.33 – 10.4.193.6210.4.193.63
1110.4.193.64/2710.4.193.65 – 10.4.193.9410.4.193.95
1210.4.193.96/2710.4.193.97 – 10.4.193.12610.4.193.127
1310.4.193.128/2710.4.193.129 – 10.4.193.15810.4.193.159
1410.4.193.160/2710.4.193.161 – 10.4.193.19010.4.193.191
1510.4.193.192/2710.4.193.193 – 10.4.193.22210.4.193.223
1610.4.193.224/2710.4.193.225 – 10.4.193.25410.4.193.255
1710.4.194.0/2710.4.194.1 – 10.4.194.3010.4.194.31
1810.4.194.32/2710.4.194.33 – 10.4.194.6210.4.194.63
1910.4.194.64/2710.4.194.65 – 10.4.194.9410.4.194.95
2010.4.194.96/2710.4.194.97 – 10.4.194.12610.4.194.127
2110.4.194.128/2710.4.194.129 – 10.4.194.15810.4.194.159
2210.4.194.160/2710.4.194.161 – 10.4.194.19010.4.194.191
2310.4.194.192/2710.4.194.193 – 10.4.194.22210.4.194.223
2410.4.194.224/2710.4.194.225 – 10.4.194.25410.4.194.255
2510.4.195.0/2710.4.195.1 – 10.4.195.3010.4.195.31
2610.4.195.32/2710.4.195.33 – 10.4.195.6210.4.195.63
2710.4.195.64/2710.4.195.65 – 10.4.195.9410.4.195.95
2810.4.195.96/2710.4.195.97 – 10.4.195.12610.4.195.127
2910.4.195.128/2710.4.195.129 – 10.4.195.15810.4.195.159
3010.4.195.160/2710.4.195.161 – 10.4.195.19010.4.195.191
3110.4.195.192/2710.4.195.193 – 10.4.195.22210.4.195.223
3210.4.195.224/2710.4.195.225 – 10.4.195.25410.4.195.255
3310.4.196.0/2710.4.196.1 – 10.4.196.3010.4.196.31
3410.4.196.32/2710.4.196.33 – 10.4.196.6210.4.196.63
3510.4.196.64/2710.4.196.65 – 10.4.196.9410.4.196.95
3610.4.196.96/2710.4.196.97 – 10.4.196.12610.4.196.127
3710.4.196.128/2710.4.196.129 – 10.4.196.15810.4.196.159
3810.4.196.160/2710.4.196.161 – 10.4.196.19010.4.196.191
3910.4.196.192/2710.4.196.193 – 10.4.196.22210.4.196.223
4010.4.196.224/2710.4.196.225 – 10.4.196.25410.4.196.255
4110.4.197.0/2710.4.197.1 – 10.4.197.3010.4.197.31
4210.4.197.32/2710.4.197.33 – 10.4.197.6210.4.197.63
4310.4.197.64/2710.4.197.65 – 10.4.197.9410.4.197.95
4410.4.197.96/2710.4.197.97 – 10.4.197.12610.4.197.127
4510.4.197.128/2710.4.197.129 – 10.4.197.15810.4.197.159
4610.4.197.160/2710.4.197.161 – 10.4.197.19010.4.197.191
4710.4.197.192/2710.4.197.193 – 10.4.197.22210.4.197.223
4810.4.197.224/2710.4.197.225 – 10.4.197.25410.4.197.255
4910.4.198.0/2710.4.198.1 – 10.4.198.3010.4.198.31
5010.4.198.32/2710.4.198.33 – 10.4.198.6210.4.198.63
5110.4.198.64/2710.4.198.65 – 10.4.198.9410.4.198.95
5210.4.198.96/2710.4.198.97 – 10.4.198.12610.4.198.127
5310.4.198.128/2710.4.198.129 – 10.4.198.15810.4.198.159
5410.4.198.160/2710.4.198.161 – 10.4.198.19010.4.198.191
5510.4.198.192/2710.4.198.193 – 10.4.198.22210.4.198.223
5610.4.198.224/2710.4.198.225 – 10.4.198.25410.4.198.255
5710.4.199.0/2710.4.199.1 – 10.4.199.3010.4.199.31
5810.4.199.32/2710.4.199.33 – 10.4.199.6210.4.199.63
5910.4.199.64/2710.4.199.65 – 10.4.199.9410.4.199.95
6010.4.199.96/2710.4.199.97 – 10.4.199.12610.4.199.127
6110.4.199.128/2710.4.199.129 – 10.4.199.15810.4.199.159
6210.4.199.160/2710.4.199.161 – 10.4.199.19010.4.199.191
6310.4.199.192/2710.4.199.193 – 10.4.199.22210.4.199.223
6410.4.199.224/2710.4.199.225 – 10.4.199.25410.4.199.255
6510.4.200.0/2710.4.200.1 – 10.4.200.3010.4.200.31
6610.4.200.32/2710.4.200.33 – 10.4.200.6210.4.200.63
6710.4.200.64/2710.4.200.65 – 10.4.200.9410.4.200.95
6810.4.200.96/2710.4.200.97 – 10.4.200.12610.4.200.127
6910.4.200.128/2710.4.200.129 – 10.4.200.15810.4.200.159
7010.4.200.160/2710.4.200.161 – 10.4.200.19010.4.200.191
7110.4.200.192/2710.4.200.193 – 10.4.200.22210.4.200.223
7210.4.200.224/2710.4.200.225 – 10.4.200.25410.4.200.255
7310.4.201.0/2710.4.201.1 – 10.4.201.3010.4.201.31
7410.4.201.32/2710.4.201.33 – 10.4.201.6210.4.201.63
7510.4.201.64/2710.4.201.65 – 10.4.201.9410.4.201.95
7610.4.201.96/2710.4.201.97 – 10.4.201.12610.4.201.127
7710.4.201.128/2710.4.201.129 – 10.4.201.15810.4.201.159
7810.4.201.160/2710.4.201.161 – 10.4.201.19010.4.201.191
7910.4.201.192/2710.4.201.193 – 10.4.201.22210.4.201.223
8010.4.201.224/2710.4.201.225 – 10.4.201.25410.4.201.255
8110.4.202.0/2710.4.202.1 – 10.4.202.3010.4.202.31
8210.4.202.32/2710.4.202.33 – 10.4.202.6210.4.202.63
8310.4.202.64/2710.4.202.65 – 10.4.202.9410.4.202.95
8410.4.202.96/2710.4.202.97 – 10.4.202.12610.4.202.127
8510.4.202.128/2710.4.202.129 – 10.4.202.15810.4.202.159
8610.4.202.160/2710.4.202.161 – 10.4.202.19010.4.202.191
8710.4.202.192/2710.4.202.193 – 10.4.202.22210.4.202.223
8810.4.202.224/2710.4.202.225 – 10.4.202.25410.4.202.255
8910.4.203.0/2710.4.203.1 – 10.4.203.3010.4.203.31
9010.4.203.32/2710.4.203.33 – 10.4.203.6210.4.203.63
9110.4.203.64/2710.4.203.65 – 10.4.203.9410.4.203.95
9210.4.203.96/2710.4.203.97 – 10.4.203.12610.4.203.127
9310.4.203.128/2710.4.203.129 – 10.4.203.15810.4.203.159
9410.4.203.160/2710.4.203.161 – 10.4.203.19010.4.203.191
9510.4.203.192/2710.4.203.193 – 10.4.203.22210.4.203.223
9610.4.203.224/2710.4.203.225 – 10.4.203.25410.4.203.255
9710.4.204.0/2710.4.204.1 – 10.4.204.3010.4.204.31
9810.4.204.32/2710.4.204.33 – 10.4.204.6210.4.204.63
9910.4.204.64/2710.4.204.65 – 10.4.204.9410.4.204.95
10010.4.204.96/2710.4.204.97 – 10.4.204.12610.4.204.127
10110.4.204.128/2710.4.204.129 – 10.4.204.15810.4.204.159
10210.4.204.160/2710.4.204.161 – 10.4.204.19010.4.204.191
10310.4.204.192/2710.4.204.193 – 10.4.204.22210.4.204.223
10410.4.204.224/2710.4.204.225 – 10.4.204.25410.4.204.255
10510.4.205.0/2710.4.205.1 – 10.4.205.3010.4.205.31
10610.4.205.32/2710.4.205.33 – 10.4.205.6210.4.205.63
10710.4.205.64/2710.4.205.65 – 10.4.205.9410.4.205.95
10810.4.205.96/2710.4.205.97 – 10.4.205.12610.4.205.127
10910.4.205.128/2710.4.205.129 – 10.4.205.15810.4.205.159
11010.4.205.160/2710.4.205.161 – 10.4.205.19010.4.205.191
11110.4.205.192/2710.4.205.193 – 10.4.205.22210.4.205.223
11210.4.205.224/2710.4.205.225 – 10.4.205.25410.4.205.255
11310.4.206.0/2710.4.206.1 – 10.4.206.3010.4.206.31
11410.4.206.32/2710.4.206.33 – 10.4.206.6210.4.206.63
11510.4.206.64/2710.4.206.65 – 10.4.206.9410.4.206.95
11610.4.206.96/2710.4.206.97 – 10.4.206.12610.4.206.127
11710.4.206.128/2710.4.206.129 – 10.4.206.15810.4.206.159
11810.4.206.160/2710.4.206.161 – 10.4.206.19010.4.206.191
11910.4.206.192/2710.4.206.193 – 10.4.206.22210.4.206.223
12010.4.206.224/2710.4.206.225 – 10.4.206.25410.4.206.255
12110.4.207.0/2710.4.207.1 – 10.4.207.3010.4.207.31
12210.4.207.32/2710.4.207.33 – 10.4.207.6210.4.207.63
12310.4.207.64/2710.4.207.65 – 10.4.207.9410.4.207.95
12410.4.207.96/2710.4.207.97 – 10.4.207.12610.4.207.127
12510.4.207.128/2710.4.207.129 – 10.4.207.15810.4.207.159
12610.4.207.160/2710.4.207.161 – 10.4.207.19010.4.207.191
12710.4.207.192/2710.4.207.193 – 10.4.207.22210.4.207.223
12810.4.207.224/2710.4.207.225 – 10.4.207.25410.4.207.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →