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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)10.2.123.0/26
network10.2.123.0/26
broadcast10.2.123.63
first host10.2.123.1
last host10.2.123.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.123.0/26
address00001010.00000010.01111011.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.01111011.00000000
broadcast00001010.00000010.01111011.00111111
green = network part, grey = host part
hex0x0a027b00
decimal167934720
reverse dns0.123.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:7b00

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.123.0/3210.2.123.0 – 10.2.123.010.2.123.0
210.2.123.1/3210.2.123.1 – 10.2.123.110.2.123.1
310.2.123.2/3210.2.123.2 – 10.2.123.210.2.123.2
410.2.123.3/3210.2.123.3 – 10.2.123.310.2.123.3
510.2.123.4/3210.2.123.4 – 10.2.123.410.2.123.4
610.2.123.5/3210.2.123.5 – 10.2.123.510.2.123.5
710.2.123.6/3210.2.123.6 – 10.2.123.610.2.123.6
810.2.123.7/3210.2.123.7 – 10.2.123.710.2.123.7
910.2.123.8/3210.2.123.8 – 10.2.123.810.2.123.8
1010.2.123.9/3210.2.123.9 – 10.2.123.910.2.123.9
1110.2.123.10/3210.2.123.10 – 10.2.123.1010.2.123.10
1210.2.123.11/3210.2.123.11 – 10.2.123.1110.2.123.11
1310.2.123.12/3210.2.123.12 – 10.2.123.1210.2.123.12
1410.2.123.13/3210.2.123.13 – 10.2.123.1310.2.123.13
1510.2.123.14/3210.2.123.14 – 10.2.123.1410.2.123.14
1610.2.123.15/3210.2.123.15 – 10.2.123.1510.2.123.15
1710.2.123.16/3210.2.123.16 – 10.2.123.1610.2.123.16
1810.2.123.17/3210.2.123.17 – 10.2.123.1710.2.123.17
1910.2.123.18/3210.2.123.18 – 10.2.123.1810.2.123.18
2010.2.123.19/3210.2.123.19 – 10.2.123.1910.2.123.19
2110.2.123.20/3210.2.123.20 – 10.2.123.2010.2.123.20
2210.2.123.21/3210.2.123.21 – 10.2.123.2110.2.123.21
2310.2.123.22/3210.2.123.22 – 10.2.123.2210.2.123.22
2410.2.123.23/3210.2.123.23 – 10.2.123.2310.2.123.23
2510.2.123.24/3210.2.123.24 – 10.2.123.2410.2.123.24
2610.2.123.25/3210.2.123.25 – 10.2.123.2510.2.123.25
2710.2.123.26/3210.2.123.26 – 10.2.123.2610.2.123.26
2810.2.123.27/3210.2.123.27 – 10.2.123.2710.2.123.27
2910.2.123.28/3210.2.123.28 – 10.2.123.2810.2.123.28
3010.2.123.29/3210.2.123.29 – 10.2.123.2910.2.123.29
3110.2.123.30/3210.2.123.30 – 10.2.123.3010.2.123.30
3210.2.123.31/3210.2.123.31 – 10.2.123.3110.2.123.31
3310.2.123.32/3210.2.123.32 – 10.2.123.3210.2.123.32
3410.2.123.33/3210.2.123.33 – 10.2.123.3310.2.123.33
3510.2.123.34/3210.2.123.34 – 10.2.123.3410.2.123.34
3610.2.123.35/3210.2.123.35 – 10.2.123.3510.2.123.35
3710.2.123.36/3210.2.123.36 – 10.2.123.3610.2.123.36
3810.2.123.37/3210.2.123.37 – 10.2.123.3710.2.123.37
3910.2.123.38/3210.2.123.38 – 10.2.123.3810.2.123.38
4010.2.123.39/3210.2.123.39 – 10.2.123.3910.2.123.39
4110.2.123.40/3210.2.123.40 – 10.2.123.4010.2.123.40
4210.2.123.41/3210.2.123.41 – 10.2.123.4110.2.123.41
4310.2.123.42/3210.2.123.42 – 10.2.123.4210.2.123.42
4410.2.123.43/3210.2.123.43 – 10.2.123.4310.2.123.43
4510.2.123.44/3210.2.123.44 – 10.2.123.4410.2.123.44
4610.2.123.45/3210.2.123.45 – 10.2.123.4510.2.123.45
4710.2.123.46/3210.2.123.46 – 10.2.123.4610.2.123.46
4810.2.123.47/3210.2.123.47 – 10.2.123.4710.2.123.47
4910.2.123.48/3210.2.123.48 – 10.2.123.4810.2.123.48
5010.2.123.49/3210.2.123.49 – 10.2.123.4910.2.123.49
5110.2.123.50/3210.2.123.50 – 10.2.123.5010.2.123.50
5210.2.123.51/3210.2.123.51 – 10.2.123.5110.2.123.51
5310.2.123.52/3210.2.123.52 – 10.2.123.5210.2.123.52
5410.2.123.53/3210.2.123.53 – 10.2.123.5310.2.123.53
5510.2.123.54/3210.2.123.54 – 10.2.123.5410.2.123.54
5610.2.123.55/3210.2.123.55 – 10.2.123.5510.2.123.55
5710.2.123.56/3210.2.123.56 – 10.2.123.5610.2.123.56
5810.2.123.57/3210.2.123.57 – 10.2.123.5710.2.123.57
5910.2.123.58/3210.2.123.58 – 10.2.123.5810.2.123.58
6010.2.123.59/3210.2.123.59 – 10.2.123.5910.2.123.59
6110.2.123.60/3210.2.123.60 – 10.2.123.6010.2.123.60
6210.2.123.61/3210.2.123.61 – 10.2.123.6110.2.123.61
6310.2.123.62/3210.2.123.62 – 10.2.123.6210.2.123.62
6410.2.123.63/3210.2.123.63 – 10.2.123.6310.2.123.63
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 →