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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)10.8.166.32/27
network10.8.166.32/27
broadcast10.8.166.63
first host10.8.166.33
last host10.8.166.62
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.8.166.32/27
address00001010.00001000.10100110.00100000
subnet mask11111111.11111111.11111111.11100000
network00001010.00001000.10100110.00100000
broadcast00001010.00001000.10100110.00111111
green = network part, grey = host part
hex0x0a08a620
decimal168338976
reverse dns32.166.8.10.in-addr.arpa
ipv4-mapped::ffff:a08:a620

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.8.166.32/3210.8.166.32 – 10.8.166.3210.8.166.32
210.8.166.33/3210.8.166.33 – 10.8.166.3310.8.166.33
310.8.166.34/3210.8.166.34 – 10.8.166.3410.8.166.34
410.8.166.35/3210.8.166.35 – 10.8.166.3510.8.166.35
510.8.166.36/3210.8.166.36 – 10.8.166.3610.8.166.36
610.8.166.37/3210.8.166.37 – 10.8.166.3710.8.166.37
710.8.166.38/3210.8.166.38 – 10.8.166.3810.8.166.38
810.8.166.39/3210.8.166.39 – 10.8.166.3910.8.166.39
910.8.166.40/3210.8.166.40 – 10.8.166.4010.8.166.40
1010.8.166.41/3210.8.166.41 – 10.8.166.4110.8.166.41
1110.8.166.42/3210.8.166.42 – 10.8.166.4210.8.166.42
1210.8.166.43/3210.8.166.43 – 10.8.166.4310.8.166.43
1310.8.166.44/3210.8.166.44 – 10.8.166.4410.8.166.44
1410.8.166.45/3210.8.166.45 – 10.8.166.4510.8.166.45
1510.8.166.46/3210.8.166.46 – 10.8.166.4610.8.166.46
1610.8.166.47/3210.8.166.47 – 10.8.166.4710.8.166.47
1710.8.166.48/3210.8.166.48 – 10.8.166.4810.8.166.48
1810.8.166.49/3210.8.166.49 – 10.8.166.4910.8.166.49
1910.8.166.50/3210.8.166.50 – 10.8.166.5010.8.166.50
2010.8.166.51/3210.8.166.51 – 10.8.166.5110.8.166.51
2110.8.166.52/3210.8.166.52 – 10.8.166.5210.8.166.52
2210.8.166.53/3210.8.166.53 – 10.8.166.5310.8.166.53
2310.8.166.54/3210.8.166.54 – 10.8.166.5410.8.166.54
2410.8.166.55/3210.8.166.55 – 10.8.166.5510.8.166.55
2510.8.166.56/3210.8.166.56 – 10.8.166.5610.8.166.56
2610.8.166.57/3210.8.166.57 – 10.8.166.5710.8.166.57
2710.8.166.58/3210.8.166.58 – 10.8.166.5810.8.166.58
2810.8.166.59/3210.8.166.59 – 10.8.166.5910.8.166.59
2910.8.166.60/3210.8.166.60 – 10.8.166.6010.8.166.60
3010.8.166.61/3210.8.166.61 – 10.8.166.6110.8.166.61
3110.8.166.62/3210.8.166.62 – 10.8.166.6210.8.166.62
3210.8.166.63/3210.8.166.63 – 10.8.166.6310.8.166.63
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 →