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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)10.0.78.32/27
network10.0.78.32/27
broadcast10.0.78.63
first host10.0.78.33
last host10.0.78.62
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.0.78.32/27
address00001010.00000000.01001110.00100000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000000.01001110.00100000
broadcast00001010.00000000.01001110.00111111
green = network part, grey = host part
hex0x0a004e20
decimal167792160
reverse dns32.78.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4e20

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.78.32/3210.0.78.32 – 10.0.78.3210.0.78.32
210.0.78.33/3210.0.78.33 – 10.0.78.3310.0.78.33
310.0.78.34/3210.0.78.34 – 10.0.78.3410.0.78.34
410.0.78.35/3210.0.78.35 – 10.0.78.3510.0.78.35
510.0.78.36/3210.0.78.36 – 10.0.78.3610.0.78.36
610.0.78.37/3210.0.78.37 – 10.0.78.3710.0.78.37
710.0.78.38/3210.0.78.38 – 10.0.78.3810.0.78.38
810.0.78.39/3210.0.78.39 – 10.0.78.3910.0.78.39
910.0.78.40/3210.0.78.40 – 10.0.78.4010.0.78.40
1010.0.78.41/3210.0.78.41 – 10.0.78.4110.0.78.41
1110.0.78.42/3210.0.78.42 – 10.0.78.4210.0.78.42
1210.0.78.43/3210.0.78.43 – 10.0.78.4310.0.78.43
1310.0.78.44/3210.0.78.44 – 10.0.78.4410.0.78.44
1410.0.78.45/3210.0.78.45 – 10.0.78.4510.0.78.45
1510.0.78.46/3210.0.78.46 – 10.0.78.4610.0.78.46
1610.0.78.47/3210.0.78.47 – 10.0.78.4710.0.78.47
1710.0.78.48/3210.0.78.48 – 10.0.78.4810.0.78.48
1810.0.78.49/3210.0.78.49 – 10.0.78.4910.0.78.49
1910.0.78.50/3210.0.78.50 – 10.0.78.5010.0.78.50
2010.0.78.51/3210.0.78.51 – 10.0.78.5110.0.78.51
2110.0.78.52/3210.0.78.52 – 10.0.78.5210.0.78.52
2210.0.78.53/3210.0.78.53 – 10.0.78.5310.0.78.53
2310.0.78.54/3210.0.78.54 – 10.0.78.5410.0.78.54
2410.0.78.55/3210.0.78.55 – 10.0.78.5510.0.78.55
2510.0.78.56/3210.0.78.56 – 10.0.78.5610.0.78.56
2610.0.78.57/3210.0.78.57 – 10.0.78.5710.0.78.57
2710.0.78.58/3210.0.78.58 – 10.0.78.5810.0.78.58
2810.0.78.59/3210.0.78.59 – 10.0.78.5910.0.78.59
2910.0.78.60/3210.0.78.60 – 10.0.78.6010.0.78.60
3010.0.78.61/3210.0.78.61 – 10.0.78.6110.0.78.61
3110.0.78.62/3210.0.78.62 – 10.0.78.6210.0.78.62
3210.0.78.63/3210.0.78.63 – 10.0.78.6310.0.78.63
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /27
/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-
/26255.255.255.1926462-
/27255.255.255.22432301
/28255.255.255.24016142 split →
/29255.255.255.248864 split →
/30255.255.255.252428 split →
/31255.255.255.2542216 split →
/32255.255.255.2551132 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 →