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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)10.3.1.32/27
network10.3.1.32/27
broadcast10.3.1.63
first host10.3.1.33
last host10.3.1.62
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.3.1.32/27
address00001010.00000011.00000001.00100000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000011.00000001.00100000
broadcast00001010.00000011.00000001.00111111
green = network part, grey = host part
hex0x0a030120
decimal167969056
reverse dns32.1.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:120

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.1.32/3210.3.1.32 – 10.3.1.3210.3.1.32
210.3.1.33/3210.3.1.33 – 10.3.1.3310.3.1.33
310.3.1.34/3210.3.1.34 – 10.3.1.3410.3.1.34
410.3.1.35/3210.3.1.35 – 10.3.1.3510.3.1.35
510.3.1.36/3210.3.1.36 – 10.3.1.3610.3.1.36
610.3.1.37/3210.3.1.37 – 10.3.1.3710.3.1.37
710.3.1.38/3210.3.1.38 – 10.3.1.3810.3.1.38
810.3.1.39/3210.3.1.39 – 10.3.1.3910.3.1.39
910.3.1.40/3210.3.1.40 – 10.3.1.4010.3.1.40
1010.3.1.41/3210.3.1.41 – 10.3.1.4110.3.1.41
1110.3.1.42/3210.3.1.42 – 10.3.1.4210.3.1.42
1210.3.1.43/3210.3.1.43 – 10.3.1.4310.3.1.43
1310.3.1.44/3210.3.1.44 – 10.3.1.4410.3.1.44
1410.3.1.45/3210.3.1.45 – 10.3.1.4510.3.1.45
1510.3.1.46/3210.3.1.46 – 10.3.1.4610.3.1.46
1610.3.1.47/3210.3.1.47 – 10.3.1.4710.3.1.47
1710.3.1.48/3210.3.1.48 – 10.3.1.4810.3.1.48
1810.3.1.49/3210.3.1.49 – 10.3.1.4910.3.1.49
1910.3.1.50/3210.3.1.50 – 10.3.1.5010.3.1.50
2010.3.1.51/3210.3.1.51 – 10.3.1.5110.3.1.51
2110.3.1.52/3210.3.1.52 – 10.3.1.5210.3.1.52
2210.3.1.53/3210.3.1.53 – 10.3.1.5310.3.1.53
2310.3.1.54/3210.3.1.54 – 10.3.1.5410.3.1.54
2410.3.1.55/3210.3.1.55 – 10.3.1.5510.3.1.55
2510.3.1.56/3210.3.1.56 – 10.3.1.5610.3.1.56
2610.3.1.57/3210.3.1.57 – 10.3.1.5710.3.1.57
2710.3.1.58/3210.3.1.58 – 10.3.1.5810.3.1.58
2810.3.1.59/3210.3.1.59 – 10.3.1.5910.3.1.59
2910.3.1.60/3210.3.1.60 – 10.3.1.6010.3.1.60
3010.3.1.61/3210.3.1.61 – 10.3.1.6110.3.1.61
3110.3.1.62/3210.3.1.62 – 10.3.1.6210.3.1.62
3210.3.1.63/3210.3.1.63 – 10.3.1.6310.3.1.63
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 →