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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)10.2.56.0/26
network10.2.56.0/26
broadcast10.2.56.63
first host10.2.56.1
last host10.2.56.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.56.0/26
address00001010.00000010.00111000.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00111000.00000000
broadcast00001010.00000010.00111000.00111111
green = network part, grey = host part
hex0x0a023800
decimal167917568
reverse dns0.56.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3800

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.56.0/3210.2.56.0 – 10.2.56.010.2.56.0
210.2.56.1/3210.2.56.1 – 10.2.56.110.2.56.1
310.2.56.2/3210.2.56.2 – 10.2.56.210.2.56.2
410.2.56.3/3210.2.56.3 – 10.2.56.310.2.56.3
510.2.56.4/3210.2.56.4 – 10.2.56.410.2.56.4
610.2.56.5/3210.2.56.5 – 10.2.56.510.2.56.5
710.2.56.6/3210.2.56.6 – 10.2.56.610.2.56.6
810.2.56.7/3210.2.56.7 – 10.2.56.710.2.56.7
910.2.56.8/3210.2.56.8 – 10.2.56.810.2.56.8
1010.2.56.9/3210.2.56.9 – 10.2.56.910.2.56.9
1110.2.56.10/3210.2.56.10 – 10.2.56.1010.2.56.10
1210.2.56.11/3210.2.56.11 – 10.2.56.1110.2.56.11
1310.2.56.12/3210.2.56.12 – 10.2.56.1210.2.56.12
1410.2.56.13/3210.2.56.13 – 10.2.56.1310.2.56.13
1510.2.56.14/3210.2.56.14 – 10.2.56.1410.2.56.14
1610.2.56.15/3210.2.56.15 – 10.2.56.1510.2.56.15
1710.2.56.16/3210.2.56.16 – 10.2.56.1610.2.56.16
1810.2.56.17/3210.2.56.17 – 10.2.56.1710.2.56.17
1910.2.56.18/3210.2.56.18 – 10.2.56.1810.2.56.18
2010.2.56.19/3210.2.56.19 – 10.2.56.1910.2.56.19
2110.2.56.20/3210.2.56.20 – 10.2.56.2010.2.56.20
2210.2.56.21/3210.2.56.21 – 10.2.56.2110.2.56.21
2310.2.56.22/3210.2.56.22 – 10.2.56.2210.2.56.22
2410.2.56.23/3210.2.56.23 – 10.2.56.2310.2.56.23
2510.2.56.24/3210.2.56.24 – 10.2.56.2410.2.56.24
2610.2.56.25/3210.2.56.25 – 10.2.56.2510.2.56.25
2710.2.56.26/3210.2.56.26 – 10.2.56.2610.2.56.26
2810.2.56.27/3210.2.56.27 – 10.2.56.2710.2.56.27
2910.2.56.28/3210.2.56.28 – 10.2.56.2810.2.56.28
3010.2.56.29/3210.2.56.29 – 10.2.56.2910.2.56.29
3110.2.56.30/3210.2.56.30 – 10.2.56.3010.2.56.30
3210.2.56.31/3210.2.56.31 – 10.2.56.3110.2.56.31
3310.2.56.32/3210.2.56.32 – 10.2.56.3210.2.56.32
3410.2.56.33/3210.2.56.33 – 10.2.56.3310.2.56.33
3510.2.56.34/3210.2.56.34 – 10.2.56.3410.2.56.34
3610.2.56.35/3210.2.56.35 – 10.2.56.3510.2.56.35
3710.2.56.36/3210.2.56.36 – 10.2.56.3610.2.56.36
3810.2.56.37/3210.2.56.37 – 10.2.56.3710.2.56.37
3910.2.56.38/3210.2.56.38 – 10.2.56.3810.2.56.38
4010.2.56.39/3210.2.56.39 – 10.2.56.3910.2.56.39
4110.2.56.40/3210.2.56.40 – 10.2.56.4010.2.56.40
4210.2.56.41/3210.2.56.41 – 10.2.56.4110.2.56.41
4310.2.56.42/3210.2.56.42 – 10.2.56.4210.2.56.42
4410.2.56.43/3210.2.56.43 – 10.2.56.4310.2.56.43
4510.2.56.44/3210.2.56.44 – 10.2.56.4410.2.56.44
4610.2.56.45/3210.2.56.45 – 10.2.56.4510.2.56.45
4710.2.56.46/3210.2.56.46 – 10.2.56.4610.2.56.46
4810.2.56.47/3210.2.56.47 – 10.2.56.4710.2.56.47
4910.2.56.48/3210.2.56.48 – 10.2.56.4810.2.56.48
5010.2.56.49/3210.2.56.49 – 10.2.56.4910.2.56.49
5110.2.56.50/3210.2.56.50 – 10.2.56.5010.2.56.50
5210.2.56.51/3210.2.56.51 – 10.2.56.5110.2.56.51
5310.2.56.52/3210.2.56.52 – 10.2.56.5210.2.56.52
5410.2.56.53/3210.2.56.53 – 10.2.56.5310.2.56.53
5510.2.56.54/3210.2.56.54 – 10.2.56.5410.2.56.54
5610.2.56.55/3210.2.56.55 – 10.2.56.5510.2.56.55
5710.2.56.56/3210.2.56.56 – 10.2.56.5610.2.56.56
5810.2.56.57/3210.2.56.57 – 10.2.56.5710.2.56.57
5910.2.56.58/3210.2.56.58 – 10.2.56.5810.2.56.58
6010.2.56.59/3210.2.56.59 – 10.2.56.5910.2.56.59
6110.2.56.60/3210.2.56.60 – 10.2.56.6010.2.56.60
6210.2.56.61/3210.2.56.61 – 10.2.56.6110.2.56.61
6310.2.56.62/3210.2.56.62 – 10.2.56.6210.2.56.62
6410.2.56.63/3210.2.56.63 – 10.2.56.6310.2.56.63
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 →