ip
ipku.in

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)10.166.65.0/26
network10.166.65.0/26
broadcast10.166.65.63
first host10.166.65.1
last host10.166.65.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.166.65.0/26
address00001010.10100110.01000001.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100110.01000001.00000000
broadcast00001010.10100110.01000001.00111111
green = network part, grey = host part
hex0x0aa64100
decimal178667776
reverse dns0.65.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:4100

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.65.0/3210.166.65.0 – 10.166.65.010.166.65.0
210.166.65.1/3210.166.65.1 – 10.166.65.110.166.65.1
310.166.65.2/3210.166.65.2 – 10.166.65.210.166.65.2
410.166.65.3/3210.166.65.3 – 10.166.65.310.166.65.3
510.166.65.4/3210.166.65.4 – 10.166.65.410.166.65.4
610.166.65.5/3210.166.65.5 – 10.166.65.510.166.65.5
710.166.65.6/3210.166.65.6 – 10.166.65.610.166.65.6
810.166.65.7/3210.166.65.7 – 10.166.65.710.166.65.7
910.166.65.8/3210.166.65.8 – 10.166.65.810.166.65.8
1010.166.65.9/3210.166.65.9 – 10.166.65.910.166.65.9
1110.166.65.10/3210.166.65.10 – 10.166.65.1010.166.65.10
1210.166.65.11/3210.166.65.11 – 10.166.65.1110.166.65.11
1310.166.65.12/3210.166.65.12 – 10.166.65.1210.166.65.12
1410.166.65.13/3210.166.65.13 – 10.166.65.1310.166.65.13
1510.166.65.14/3210.166.65.14 – 10.166.65.1410.166.65.14
1610.166.65.15/3210.166.65.15 – 10.166.65.1510.166.65.15
1710.166.65.16/3210.166.65.16 – 10.166.65.1610.166.65.16
1810.166.65.17/3210.166.65.17 – 10.166.65.1710.166.65.17
1910.166.65.18/3210.166.65.18 – 10.166.65.1810.166.65.18
2010.166.65.19/3210.166.65.19 – 10.166.65.1910.166.65.19
2110.166.65.20/3210.166.65.20 – 10.166.65.2010.166.65.20
2210.166.65.21/3210.166.65.21 – 10.166.65.2110.166.65.21
2310.166.65.22/3210.166.65.22 – 10.166.65.2210.166.65.22
2410.166.65.23/3210.166.65.23 – 10.166.65.2310.166.65.23
2510.166.65.24/3210.166.65.24 – 10.166.65.2410.166.65.24
2610.166.65.25/3210.166.65.25 – 10.166.65.2510.166.65.25
2710.166.65.26/3210.166.65.26 – 10.166.65.2610.166.65.26
2810.166.65.27/3210.166.65.27 – 10.166.65.2710.166.65.27
2910.166.65.28/3210.166.65.28 – 10.166.65.2810.166.65.28
3010.166.65.29/3210.166.65.29 – 10.166.65.2910.166.65.29
3110.166.65.30/3210.166.65.30 – 10.166.65.3010.166.65.30
3210.166.65.31/3210.166.65.31 – 10.166.65.3110.166.65.31
3310.166.65.32/3210.166.65.32 – 10.166.65.3210.166.65.32
3410.166.65.33/3210.166.65.33 – 10.166.65.3310.166.65.33
3510.166.65.34/3210.166.65.34 – 10.166.65.3410.166.65.34
3610.166.65.35/3210.166.65.35 – 10.166.65.3510.166.65.35
3710.166.65.36/3210.166.65.36 – 10.166.65.3610.166.65.36
3810.166.65.37/3210.166.65.37 – 10.166.65.3710.166.65.37
3910.166.65.38/3210.166.65.38 – 10.166.65.3810.166.65.38
4010.166.65.39/3210.166.65.39 – 10.166.65.3910.166.65.39
4110.166.65.40/3210.166.65.40 – 10.166.65.4010.166.65.40
4210.166.65.41/3210.166.65.41 – 10.166.65.4110.166.65.41
4310.166.65.42/3210.166.65.42 – 10.166.65.4210.166.65.42
4410.166.65.43/3210.166.65.43 – 10.166.65.4310.166.65.43
4510.166.65.44/3210.166.65.44 – 10.166.65.4410.166.65.44
4610.166.65.45/3210.166.65.45 – 10.166.65.4510.166.65.45
4710.166.65.46/3210.166.65.46 – 10.166.65.4610.166.65.46
4810.166.65.47/3210.166.65.47 – 10.166.65.4710.166.65.47
4910.166.65.48/3210.166.65.48 – 10.166.65.4810.166.65.48
5010.166.65.49/3210.166.65.49 – 10.166.65.4910.166.65.49
5110.166.65.50/3210.166.65.50 – 10.166.65.5010.166.65.50
5210.166.65.51/3210.166.65.51 – 10.166.65.5110.166.65.51
5310.166.65.52/3210.166.65.52 – 10.166.65.5210.166.65.52
5410.166.65.53/3210.166.65.53 – 10.166.65.5310.166.65.53
5510.166.65.54/3210.166.65.54 – 10.166.65.5410.166.65.54
5610.166.65.55/3210.166.65.55 – 10.166.65.5510.166.65.55
5710.166.65.56/3210.166.65.56 – 10.166.65.5610.166.65.56
5810.166.65.57/3210.166.65.57 – 10.166.65.5710.166.65.57
5910.166.65.58/3210.166.65.58 – 10.166.65.5810.166.65.58
6010.166.65.59/3210.166.65.59 – 10.166.65.5910.166.65.59
6110.166.65.60/3210.166.65.60 – 10.166.65.6010.166.65.60
6210.166.65.61/3210.166.65.61 – 10.166.65.6110.166.65.61
6310.166.65.62/3210.166.65.62 – 10.166.65.6210.166.65.62
6410.166.65.63/3210.166.65.63 – 10.166.65.6310.166.65.63
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 →