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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)10.2.187.0/26
network10.2.187.0/26
broadcast10.2.187.63
first host10.2.187.1
last host10.2.187.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.187.0/26
address00001010.00000010.10111011.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.10111011.00000000
broadcast00001010.00000010.10111011.00111111
green = network part, grey = host part
hex0x0a02bb00
decimal167951104
reverse dns0.187.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:bb00

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.187.0/3210.2.187.0 – 10.2.187.010.2.187.0
210.2.187.1/3210.2.187.1 – 10.2.187.110.2.187.1
310.2.187.2/3210.2.187.2 – 10.2.187.210.2.187.2
410.2.187.3/3210.2.187.3 – 10.2.187.310.2.187.3
510.2.187.4/3210.2.187.4 – 10.2.187.410.2.187.4
610.2.187.5/3210.2.187.5 – 10.2.187.510.2.187.5
710.2.187.6/3210.2.187.6 – 10.2.187.610.2.187.6
810.2.187.7/3210.2.187.7 – 10.2.187.710.2.187.7
910.2.187.8/3210.2.187.8 – 10.2.187.810.2.187.8
1010.2.187.9/3210.2.187.9 – 10.2.187.910.2.187.9
1110.2.187.10/3210.2.187.10 – 10.2.187.1010.2.187.10
1210.2.187.11/3210.2.187.11 – 10.2.187.1110.2.187.11
1310.2.187.12/3210.2.187.12 – 10.2.187.1210.2.187.12
1410.2.187.13/3210.2.187.13 – 10.2.187.1310.2.187.13
1510.2.187.14/3210.2.187.14 – 10.2.187.1410.2.187.14
1610.2.187.15/3210.2.187.15 – 10.2.187.1510.2.187.15
1710.2.187.16/3210.2.187.16 – 10.2.187.1610.2.187.16
1810.2.187.17/3210.2.187.17 – 10.2.187.1710.2.187.17
1910.2.187.18/3210.2.187.18 – 10.2.187.1810.2.187.18
2010.2.187.19/3210.2.187.19 – 10.2.187.1910.2.187.19
2110.2.187.20/3210.2.187.20 – 10.2.187.2010.2.187.20
2210.2.187.21/3210.2.187.21 – 10.2.187.2110.2.187.21
2310.2.187.22/3210.2.187.22 – 10.2.187.2210.2.187.22
2410.2.187.23/3210.2.187.23 – 10.2.187.2310.2.187.23
2510.2.187.24/3210.2.187.24 – 10.2.187.2410.2.187.24
2610.2.187.25/3210.2.187.25 – 10.2.187.2510.2.187.25
2710.2.187.26/3210.2.187.26 – 10.2.187.2610.2.187.26
2810.2.187.27/3210.2.187.27 – 10.2.187.2710.2.187.27
2910.2.187.28/3210.2.187.28 – 10.2.187.2810.2.187.28
3010.2.187.29/3210.2.187.29 – 10.2.187.2910.2.187.29
3110.2.187.30/3210.2.187.30 – 10.2.187.3010.2.187.30
3210.2.187.31/3210.2.187.31 – 10.2.187.3110.2.187.31
3310.2.187.32/3210.2.187.32 – 10.2.187.3210.2.187.32
3410.2.187.33/3210.2.187.33 – 10.2.187.3310.2.187.33
3510.2.187.34/3210.2.187.34 – 10.2.187.3410.2.187.34
3610.2.187.35/3210.2.187.35 – 10.2.187.3510.2.187.35
3710.2.187.36/3210.2.187.36 – 10.2.187.3610.2.187.36
3810.2.187.37/3210.2.187.37 – 10.2.187.3710.2.187.37
3910.2.187.38/3210.2.187.38 – 10.2.187.3810.2.187.38
4010.2.187.39/3210.2.187.39 – 10.2.187.3910.2.187.39
4110.2.187.40/3210.2.187.40 – 10.2.187.4010.2.187.40
4210.2.187.41/3210.2.187.41 – 10.2.187.4110.2.187.41
4310.2.187.42/3210.2.187.42 – 10.2.187.4210.2.187.42
4410.2.187.43/3210.2.187.43 – 10.2.187.4310.2.187.43
4510.2.187.44/3210.2.187.44 – 10.2.187.4410.2.187.44
4610.2.187.45/3210.2.187.45 – 10.2.187.4510.2.187.45
4710.2.187.46/3210.2.187.46 – 10.2.187.4610.2.187.46
4810.2.187.47/3210.2.187.47 – 10.2.187.4710.2.187.47
4910.2.187.48/3210.2.187.48 – 10.2.187.4810.2.187.48
5010.2.187.49/3210.2.187.49 – 10.2.187.4910.2.187.49
5110.2.187.50/3210.2.187.50 – 10.2.187.5010.2.187.50
5210.2.187.51/3210.2.187.51 – 10.2.187.5110.2.187.51
5310.2.187.52/3210.2.187.52 – 10.2.187.5210.2.187.52
5410.2.187.53/3210.2.187.53 – 10.2.187.5310.2.187.53
5510.2.187.54/3210.2.187.54 – 10.2.187.5410.2.187.54
5610.2.187.55/3210.2.187.55 – 10.2.187.5510.2.187.55
5710.2.187.56/3210.2.187.56 – 10.2.187.5610.2.187.56
5810.2.187.57/3210.2.187.57 – 10.2.187.5710.2.187.57
5910.2.187.58/3210.2.187.58 – 10.2.187.5810.2.187.58
6010.2.187.59/3210.2.187.59 – 10.2.187.5910.2.187.59
6110.2.187.60/3210.2.187.60 – 10.2.187.6010.2.187.60
6210.2.187.61/3210.2.187.61 – 10.2.187.6110.2.187.61
6310.2.187.62/3210.2.187.62 – 10.2.187.6210.2.187.62
6410.2.187.63/3210.2.187.63 – 10.2.187.6310.2.187.63
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 →