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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)172.16.2.32/27
network172.16.2.32/27
broadcast172.16.2.63
first host172.16.2.33
last host172.16.2.62
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classB
ipcalc 172.16.2.32/27
address10101100.00010000.00000010.00100000
subnet mask11111111.11111111.11111111.11100000
network10101100.00010000.00000010.00100000
broadcast10101100.00010000.00000010.00111111
green = network part, grey = host part
hex0xac100220
decimal2886730272
reverse dns32.2.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:220

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.2.32/32172.16.2.32 – 172.16.2.32172.16.2.32
2172.16.2.33/32172.16.2.33 – 172.16.2.33172.16.2.33
3172.16.2.34/32172.16.2.34 – 172.16.2.34172.16.2.34
4172.16.2.35/32172.16.2.35 – 172.16.2.35172.16.2.35
5172.16.2.36/32172.16.2.36 – 172.16.2.36172.16.2.36
6172.16.2.37/32172.16.2.37 – 172.16.2.37172.16.2.37
7172.16.2.38/32172.16.2.38 – 172.16.2.38172.16.2.38
8172.16.2.39/32172.16.2.39 – 172.16.2.39172.16.2.39
9172.16.2.40/32172.16.2.40 – 172.16.2.40172.16.2.40
10172.16.2.41/32172.16.2.41 – 172.16.2.41172.16.2.41
11172.16.2.42/32172.16.2.42 – 172.16.2.42172.16.2.42
12172.16.2.43/32172.16.2.43 – 172.16.2.43172.16.2.43
13172.16.2.44/32172.16.2.44 – 172.16.2.44172.16.2.44
14172.16.2.45/32172.16.2.45 – 172.16.2.45172.16.2.45
15172.16.2.46/32172.16.2.46 – 172.16.2.46172.16.2.46
16172.16.2.47/32172.16.2.47 – 172.16.2.47172.16.2.47
17172.16.2.48/32172.16.2.48 – 172.16.2.48172.16.2.48
18172.16.2.49/32172.16.2.49 – 172.16.2.49172.16.2.49
19172.16.2.50/32172.16.2.50 – 172.16.2.50172.16.2.50
20172.16.2.51/32172.16.2.51 – 172.16.2.51172.16.2.51
21172.16.2.52/32172.16.2.52 – 172.16.2.52172.16.2.52
22172.16.2.53/32172.16.2.53 – 172.16.2.53172.16.2.53
23172.16.2.54/32172.16.2.54 – 172.16.2.54172.16.2.54
24172.16.2.55/32172.16.2.55 – 172.16.2.55172.16.2.55
25172.16.2.56/32172.16.2.56 – 172.16.2.56172.16.2.56
26172.16.2.57/32172.16.2.57 – 172.16.2.57172.16.2.57
27172.16.2.58/32172.16.2.58 – 172.16.2.58172.16.2.58
28172.16.2.59/32172.16.2.59 – 172.16.2.59172.16.2.59
29172.16.2.60/32172.16.2.60 – 172.16.2.60172.16.2.60
30172.16.2.61/32172.16.2.61 – 172.16.2.61172.16.2.61
31172.16.2.62/32172.16.2.62 – 172.16.2.62172.16.2.62
32172.16.2.63/32172.16.2.63 – 172.16.2.63172.16.2.63
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 →