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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)10.3.243.0/26
network10.3.243.0/26
broadcast10.3.243.63
first host10.3.243.1
last host10.3.243.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.243.0/26
address00001010.00000011.11110011.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.11110011.00000000
broadcast00001010.00000011.11110011.00111111
green = network part, grey = host part
hex0x0a03f300
decimal168030976
reverse dns0.243.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:f300

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.243.0/3210.3.243.0 – 10.3.243.010.3.243.0
210.3.243.1/3210.3.243.1 – 10.3.243.110.3.243.1
310.3.243.2/3210.3.243.2 – 10.3.243.210.3.243.2
410.3.243.3/3210.3.243.3 – 10.3.243.310.3.243.3
510.3.243.4/3210.3.243.4 – 10.3.243.410.3.243.4
610.3.243.5/3210.3.243.5 – 10.3.243.510.3.243.5
710.3.243.6/3210.3.243.6 – 10.3.243.610.3.243.6
810.3.243.7/3210.3.243.7 – 10.3.243.710.3.243.7
910.3.243.8/3210.3.243.8 – 10.3.243.810.3.243.8
1010.3.243.9/3210.3.243.9 – 10.3.243.910.3.243.9
1110.3.243.10/3210.3.243.10 – 10.3.243.1010.3.243.10
1210.3.243.11/3210.3.243.11 – 10.3.243.1110.3.243.11
1310.3.243.12/3210.3.243.12 – 10.3.243.1210.3.243.12
1410.3.243.13/3210.3.243.13 – 10.3.243.1310.3.243.13
1510.3.243.14/3210.3.243.14 – 10.3.243.1410.3.243.14
1610.3.243.15/3210.3.243.15 – 10.3.243.1510.3.243.15
1710.3.243.16/3210.3.243.16 – 10.3.243.1610.3.243.16
1810.3.243.17/3210.3.243.17 – 10.3.243.1710.3.243.17
1910.3.243.18/3210.3.243.18 – 10.3.243.1810.3.243.18
2010.3.243.19/3210.3.243.19 – 10.3.243.1910.3.243.19
2110.3.243.20/3210.3.243.20 – 10.3.243.2010.3.243.20
2210.3.243.21/3210.3.243.21 – 10.3.243.2110.3.243.21
2310.3.243.22/3210.3.243.22 – 10.3.243.2210.3.243.22
2410.3.243.23/3210.3.243.23 – 10.3.243.2310.3.243.23
2510.3.243.24/3210.3.243.24 – 10.3.243.2410.3.243.24
2610.3.243.25/3210.3.243.25 – 10.3.243.2510.3.243.25
2710.3.243.26/3210.3.243.26 – 10.3.243.2610.3.243.26
2810.3.243.27/3210.3.243.27 – 10.3.243.2710.3.243.27
2910.3.243.28/3210.3.243.28 – 10.3.243.2810.3.243.28
3010.3.243.29/3210.3.243.29 – 10.3.243.2910.3.243.29
3110.3.243.30/3210.3.243.30 – 10.3.243.3010.3.243.30
3210.3.243.31/3210.3.243.31 – 10.3.243.3110.3.243.31
3310.3.243.32/3210.3.243.32 – 10.3.243.3210.3.243.32
3410.3.243.33/3210.3.243.33 – 10.3.243.3310.3.243.33
3510.3.243.34/3210.3.243.34 – 10.3.243.3410.3.243.34
3610.3.243.35/3210.3.243.35 – 10.3.243.3510.3.243.35
3710.3.243.36/3210.3.243.36 – 10.3.243.3610.3.243.36
3810.3.243.37/3210.3.243.37 – 10.3.243.3710.3.243.37
3910.3.243.38/3210.3.243.38 – 10.3.243.3810.3.243.38
4010.3.243.39/3210.3.243.39 – 10.3.243.3910.3.243.39
4110.3.243.40/3210.3.243.40 – 10.3.243.4010.3.243.40
4210.3.243.41/3210.3.243.41 – 10.3.243.4110.3.243.41
4310.3.243.42/3210.3.243.42 – 10.3.243.4210.3.243.42
4410.3.243.43/3210.3.243.43 – 10.3.243.4310.3.243.43
4510.3.243.44/3210.3.243.44 – 10.3.243.4410.3.243.44
4610.3.243.45/3210.3.243.45 – 10.3.243.4510.3.243.45
4710.3.243.46/3210.3.243.46 – 10.3.243.4610.3.243.46
4810.3.243.47/3210.3.243.47 – 10.3.243.4710.3.243.47
4910.3.243.48/3210.3.243.48 – 10.3.243.4810.3.243.48
5010.3.243.49/3210.3.243.49 – 10.3.243.4910.3.243.49
5110.3.243.50/3210.3.243.50 – 10.3.243.5010.3.243.50
5210.3.243.51/3210.3.243.51 – 10.3.243.5110.3.243.51
5310.3.243.52/3210.3.243.52 – 10.3.243.5210.3.243.52
5410.3.243.53/3210.3.243.53 – 10.3.243.5310.3.243.53
5510.3.243.54/3210.3.243.54 – 10.3.243.5410.3.243.54
5610.3.243.55/3210.3.243.55 – 10.3.243.5510.3.243.55
5710.3.243.56/3210.3.243.56 – 10.3.243.5610.3.243.56
5810.3.243.57/3210.3.243.57 – 10.3.243.5710.3.243.57
5910.3.243.58/3210.3.243.58 – 10.3.243.5810.3.243.58
6010.3.243.59/3210.3.243.59 – 10.3.243.5910.3.243.59
6110.3.243.60/3210.3.243.60 – 10.3.243.6010.3.243.60
6210.3.243.61/3210.3.243.61 – 10.3.243.6110.3.243.61
6310.3.243.62/3210.3.243.62 – 10.3.243.6210.3.243.62
6410.3.243.63/3210.3.243.63 – 10.3.243.6310.3.243.63
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 →