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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)10.72.71.0/26
network10.72.71.0/26
broadcast10.72.71.63
first host10.72.71.1
last host10.72.71.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.72.71.0/26
address00001010.01001000.01000111.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01001000.01000111.00000000
broadcast00001010.01001000.01000111.00111111
green = network part, grey = host part
hex0x0a484700
decimal172508928
reverse dns0.71.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4700

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.71.0/3210.72.71.0 – 10.72.71.010.72.71.0
210.72.71.1/3210.72.71.1 – 10.72.71.110.72.71.1
310.72.71.2/3210.72.71.2 – 10.72.71.210.72.71.2
410.72.71.3/3210.72.71.3 – 10.72.71.310.72.71.3
510.72.71.4/3210.72.71.4 – 10.72.71.410.72.71.4
610.72.71.5/3210.72.71.5 – 10.72.71.510.72.71.5
710.72.71.6/3210.72.71.6 – 10.72.71.610.72.71.6
810.72.71.7/3210.72.71.7 – 10.72.71.710.72.71.7
910.72.71.8/3210.72.71.8 – 10.72.71.810.72.71.8
1010.72.71.9/3210.72.71.9 – 10.72.71.910.72.71.9
1110.72.71.10/3210.72.71.10 – 10.72.71.1010.72.71.10
1210.72.71.11/3210.72.71.11 – 10.72.71.1110.72.71.11
1310.72.71.12/3210.72.71.12 – 10.72.71.1210.72.71.12
1410.72.71.13/3210.72.71.13 – 10.72.71.1310.72.71.13
1510.72.71.14/3210.72.71.14 – 10.72.71.1410.72.71.14
1610.72.71.15/3210.72.71.15 – 10.72.71.1510.72.71.15
1710.72.71.16/3210.72.71.16 – 10.72.71.1610.72.71.16
1810.72.71.17/3210.72.71.17 – 10.72.71.1710.72.71.17
1910.72.71.18/3210.72.71.18 – 10.72.71.1810.72.71.18
2010.72.71.19/3210.72.71.19 – 10.72.71.1910.72.71.19
2110.72.71.20/3210.72.71.20 – 10.72.71.2010.72.71.20
2210.72.71.21/3210.72.71.21 – 10.72.71.2110.72.71.21
2310.72.71.22/3210.72.71.22 – 10.72.71.2210.72.71.22
2410.72.71.23/3210.72.71.23 – 10.72.71.2310.72.71.23
2510.72.71.24/3210.72.71.24 – 10.72.71.2410.72.71.24
2610.72.71.25/3210.72.71.25 – 10.72.71.2510.72.71.25
2710.72.71.26/3210.72.71.26 – 10.72.71.2610.72.71.26
2810.72.71.27/3210.72.71.27 – 10.72.71.2710.72.71.27
2910.72.71.28/3210.72.71.28 – 10.72.71.2810.72.71.28
3010.72.71.29/3210.72.71.29 – 10.72.71.2910.72.71.29
3110.72.71.30/3210.72.71.30 – 10.72.71.3010.72.71.30
3210.72.71.31/3210.72.71.31 – 10.72.71.3110.72.71.31
3310.72.71.32/3210.72.71.32 – 10.72.71.3210.72.71.32
3410.72.71.33/3210.72.71.33 – 10.72.71.3310.72.71.33
3510.72.71.34/3210.72.71.34 – 10.72.71.3410.72.71.34
3610.72.71.35/3210.72.71.35 – 10.72.71.3510.72.71.35
3710.72.71.36/3210.72.71.36 – 10.72.71.3610.72.71.36
3810.72.71.37/3210.72.71.37 – 10.72.71.3710.72.71.37
3910.72.71.38/3210.72.71.38 – 10.72.71.3810.72.71.38
4010.72.71.39/3210.72.71.39 – 10.72.71.3910.72.71.39
4110.72.71.40/3210.72.71.40 – 10.72.71.4010.72.71.40
4210.72.71.41/3210.72.71.41 – 10.72.71.4110.72.71.41
4310.72.71.42/3210.72.71.42 – 10.72.71.4210.72.71.42
4410.72.71.43/3210.72.71.43 – 10.72.71.4310.72.71.43
4510.72.71.44/3210.72.71.44 – 10.72.71.4410.72.71.44
4610.72.71.45/3210.72.71.45 – 10.72.71.4510.72.71.45
4710.72.71.46/3210.72.71.46 – 10.72.71.4610.72.71.46
4810.72.71.47/3210.72.71.47 – 10.72.71.4710.72.71.47
4910.72.71.48/3210.72.71.48 – 10.72.71.4810.72.71.48
5010.72.71.49/3210.72.71.49 – 10.72.71.4910.72.71.49
5110.72.71.50/3210.72.71.50 – 10.72.71.5010.72.71.50
5210.72.71.51/3210.72.71.51 – 10.72.71.5110.72.71.51
5310.72.71.52/3210.72.71.52 – 10.72.71.5210.72.71.52
5410.72.71.53/3210.72.71.53 – 10.72.71.5310.72.71.53
5510.72.71.54/3210.72.71.54 – 10.72.71.5410.72.71.54
5610.72.71.55/3210.72.71.55 – 10.72.71.5510.72.71.55
5710.72.71.56/3210.72.71.56 – 10.72.71.5610.72.71.56
5810.72.71.57/3210.72.71.57 – 10.72.71.5710.72.71.57
5910.72.71.58/3210.72.71.58 – 10.72.71.5810.72.71.58
6010.72.71.59/3210.72.71.59 – 10.72.71.5910.72.71.59
6110.72.71.60/3210.72.71.60 – 10.72.71.6010.72.71.60
6210.72.71.61/3210.72.71.61 – 10.72.71.6110.72.71.61
6310.72.71.62/3210.72.71.62 – 10.72.71.6210.72.71.62
6410.72.71.63/3210.72.71.63 – 10.72.71.6310.72.71.63
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /26
/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-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →