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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)10.166.167.32/27
network10.166.167.32/27
broadcast10.166.167.63
first host10.166.167.33
last host10.166.167.62
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.166.167.32/27
address00001010.10100110.10100111.00100000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100110.10100111.00100000
broadcast00001010.10100110.10100111.00111111
green = network part, grey = host part
hex0x0aa6a720
decimal178693920
reverse dns32.167.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:a720

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.166.167.32/3210.166.167.32 – 10.166.167.3210.166.167.32
210.166.167.33/3210.166.167.33 – 10.166.167.3310.166.167.33
310.166.167.34/3210.166.167.34 – 10.166.167.3410.166.167.34
410.166.167.35/3210.166.167.35 – 10.166.167.3510.166.167.35
510.166.167.36/3210.166.167.36 – 10.166.167.3610.166.167.36
610.166.167.37/3210.166.167.37 – 10.166.167.3710.166.167.37
710.166.167.38/3210.166.167.38 – 10.166.167.3810.166.167.38
810.166.167.39/3210.166.167.39 – 10.166.167.3910.166.167.39
910.166.167.40/3210.166.167.40 – 10.166.167.4010.166.167.40
1010.166.167.41/3210.166.167.41 – 10.166.167.4110.166.167.41
1110.166.167.42/3210.166.167.42 – 10.166.167.4210.166.167.42
1210.166.167.43/3210.166.167.43 – 10.166.167.4310.166.167.43
1310.166.167.44/3210.166.167.44 – 10.166.167.4410.166.167.44
1410.166.167.45/3210.166.167.45 – 10.166.167.4510.166.167.45
1510.166.167.46/3210.166.167.46 – 10.166.167.4610.166.167.46
1610.166.167.47/3210.166.167.47 – 10.166.167.4710.166.167.47
1710.166.167.48/3210.166.167.48 – 10.166.167.4810.166.167.48
1810.166.167.49/3210.166.167.49 – 10.166.167.4910.166.167.49
1910.166.167.50/3210.166.167.50 – 10.166.167.5010.166.167.50
2010.166.167.51/3210.166.167.51 – 10.166.167.5110.166.167.51
2110.166.167.52/3210.166.167.52 – 10.166.167.5210.166.167.52
2210.166.167.53/3210.166.167.53 – 10.166.167.5310.166.167.53
2310.166.167.54/3210.166.167.54 – 10.166.167.5410.166.167.54
2410.166.167.55/3210.166.167.55 – 10.166.167.5510.166.167.55
2510.166.167.56/3210.166.167.56 – 10.166.167.5610.166.167.56
2610.166.167.57/3210.166.167.57 – 10.166.167.5710.166.167.57
2710.166.167.58/3210.166.167.58 – 10.166.167.5810.166.167.58
2810.166.167.59/3210.166.167.59 – 10.166.167.5910.166.167.59
2910.166.167.60/3210.166.167.60 – 10.166.167.6010.166.167.60
3010.166.167.61/3210.166.167.61 – 10.166.167.6110.166.167.61
3110.166.167.62/3210.166.167.62 – 10.166.167.6210.166.167.62
3210.166.167.63/3210.166.167.63 – 10.166.167.6310.166.167.63
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 →