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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)10.2.33.0/26
network10.2.33.0/26
broadcast10.2.33.63
first host10.2.33.1
last host10.2.33.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.33.0/26
address00001010.00000010.00100001.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00100001.00000000
broadcast00001010.00000010.00100001.00111111
green = network part, grey = host part
hex0x0a022100
decimal167911680
reverse dns0.33.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2100

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.33.0/3210.2.33.0 – 10.2.33.010.2.33.0
210.2.33.1/3210.2.33.1 – 10.2.33.110.2.33.1
310.2.33.2/3210.2.33.2 – 10.2.33.210.2.33.2
410.2.33.3/3210.2.33.3 – 10.2.33.310.2.33.3
510.2.33.4/3210.2.33.4 – 10.2.33.410.2.33.4
610.2.33.5/3210.2.33.5 – 10.2.33.510.2.33.5
710.2.33.6/3210.2.33.6 – 10.2.33.610.2.33.6
810.2.33.7/3210.2.33.7 – 10.2.33.710.2.33.7
910.2.33.8/3210.2.33.8 – 10.2.33.810.2.33.8
1010.2.33.9/3210.2.33.9 – 10.2.33.910.2.33.9
1110.2.33.10/3210.2.33.10 – 10.2.33.1010.2.33.10
1210.2.33.11/3210.2.33.11 – 10.2.33.1110.2.33.11
1310.2.33.12/3210.2.33.12 – 10.2.33.1210.2.33.12
1410.2.33.13/3210.2.33.13 – 10.2.33.1310.2.33.13
1510.2.33.14/3210.2.33.14 – 10.2.33.1410.2.33.14
1610.2.33.15/3210.2.33.15 – 10.2.33.1510.2.33.15
1710.2.33.16/3210.2.33.16 – 10.2.33.1610.2.33.16
1810.2.33.17/3210.2.33.17 – 10.2.33.1710.2.33.17
1910.2.33.18/3210.2.33.18 – 10.2.33.1810.2.33.18
2010.2.33.19/3210.2.33.19 – 10.2.33.1910.2.33.19
2110.2.33.20/3210.2.33.20 – 10.2.33.2010.2.33.20
2210.2.33.21/3210.2.33.21 – 10.2.33.2110.2.33.21
2310.2.33.22/3210.2.33.22 – 10.2.33.2210.2.33.22
2410.2.33.23/3210.2.33.23 – 10.2.33.2310.2.33.23
2510.2.33.24/3210.2.33.24 – 10.2.33.2410.2.33.24
2610.2.33.25/3210.2.33.25 – 10.2.33.2510.2.33.25
2710.2.33.26/3210.2.33.26 – 10.2.33.2610.2.33.26
2810.2.33.27/3210.2.33.27 – 10.2.33.2710.2.33.27
2910.2.33.28/3210.2.33.28 – 10.2.33.2810.2.33.28
3010.2.33.29/3210.2.33.29 – 10.2.33.2910.2.33.29
3110.2.33.30/3210.2.33.30 – 10.2.33.3010.2.33.30
3210.2.33.31/3210.2.33.31 – 10.2.33.3110.2.33.31
3310.2.33.32/3210.2.33.32 – 10.2.33.3210.2.33.32
3410.2.33.33/3210.2.33.33 – 10.2.33.3310.2.33.33
3510.2.33.34/3210.2.33.34 – 10.2.33.3410.2.33.34
3610.2.33.35/3210.2.33.35 – 10.2.33.3510.2.33.35
3710.2.33.36/3210.2.33.36 – 10.2.33.3610.2.33.36
3810.2.33.37/3210.2.33.37 – 10.2.33.3710.2.33.37
3910.2.33.38/3210.2.33.38 – 10.2.33.3810.2.33.38
4010.2.33.39/3210.2.33.39 – 10.2.33.3910.2.33.39
4110.2.33.40/3210.2.33.40 – 10.2.33.4010.2.33.40
4210.2.33.41/3210.2.33.41 – 10.2.33.4110.2.33.41
4310.2.33.42/3210.2.33.42 – 10.2.33.4210.2.33.42
4410.2.33.43/3210.2.33.43 – 10.2.33.4310.2.33.43
4510.2.33.44/3210.2.33.44 – 10.2.33.4410.2.33.44
4610.2.33.45/3210.2.33.45 – 10.2.33.4510.2.33.45
4710.2.33.46/3210.2.33.46 – 10.2.33.4610.2.33.46
4810.2.33.47/3210.2.33.47 – 10.2.33.4710.2.33.47
4910.2.33.48/3210.2.33.48 – 10.2.33.4810.2.33.48
5010.2.33.49/3210.2.33.49 – 10.2.33.4910.2.33.49
5110.2.33.50/3210.2.33.50 – 10.2.33.5010.2.33.50
5210.2.33.51/3210.2.33.51 – 10.2.33.5110.2.33.51
5310.2.33.52/3210.2.33.52 – 10.2.33.5210.2.33.52
5410.2.33.53/3210.2.33.53 – 10.2.33.5310.2.33.53
5510.2.33.54/3210.2.33.54 – 10.2.33.5410.2.33.54
5610.2.33.55/3210.2.33.55 – 10.2.33.5510.2.33.55
5710.2.33.56/3210.2.33.56 – 10.2.33.5610.2.33.56
5810.2.33.57/3210.2.33.57 – 10.2.33.5710.2.33.57
5910.2.33.58/3210.2.33.58 – 10.2.33.5810.2.33.58
6010.2.33.59/3210.2.33.59 – 10.2.33.5910.2.33.59
6110.2.33.60/3210.2.33.60 – 10.2.33.6010.2.33.60
6210.2.33.61/3210.2.33.61 – 10.2.33.6110.2.33.61
6310.2.33.62/3210.2.33.62 – 10.2.33.6210.2.33.62
6410.2.33.63/3210.2.33.63 – 10.2.33.6310.2.33.63
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 →