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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)172.16.6.0/26
network172.16.6.0/26
broadcast172.16.6.63
first host172.16.6.1
last host172.16.6.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.6.0/26
address10101100.00010000.00000110.00000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000110.00000000
broadcast10101100.00010000.00000110.00111111
green = network part, grey = host part
hex0xac100600
decimal2886731264
reverse dns0.6.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:600

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.6.0/32172.16.6.0 – 172.16.6.0172.16.6.0
2172.16.6.1/32172.16.6.1 – 172.16.6.1172.16.6.1
3172.16.6.2/32172.16.6.2 – 172.16.6.2172.16.6.2
4172.16.6.3/32172.16.6.3 – 172.16.6.3172.16.6.3
5172.16.6.4/32172.16.6.4 – 172.16.6.4172.16.6.4
6172.16.6.5/32172.16.6.5 – 172.16.6.5172.16.6.5
7172.16.6.6/32172.16.6.6 – 172.16.6.6172.16.6.6
8172.16.6.7/32172.16.6.7 – 172.16.6.7172.16.6.7
9172.16.6.8/32172.16.6.8 – 172.16.6.8172.16.6.8
10172.16.6.9/32172.16.6.9 – 172.16.6.9172.16.6.9
11172.16.6.10/32172.16.6.10 – 172.16.6.10172.16.6.10
12172.16.6.11/32172.16.6.11 – 172.16.6.11172.16.6.11
13172.16.6.12/32172.16.6.12 – 172.16.6.12172.16.6.12
14172.16.6.13/32172.16.6.13 – 172.16.6.13172.16.6.13
15172.16.6.14/32172.16.6.14 – 172.16.6.14172.16.6.14
16172.16.6.15/32172.16.6.15 – 172.16.6.15172.16.6.15
17172.16.6.16/32172.16.6.16 – 172.16.6.16172.16.6.16
18172.16.6.17/32172.16.6.17 – 172.16.6.17172.16.6.17
19172.16.6.18/32172.16.6.18 – 172.16.6.18172.16.6.18
20172.16.6.19/32172.16.6.19 – 172.16.6.19172.16.6.19
21172.16.6.20/32172.16.6.20 – 172.16.6.20172.16.6.20
22172.16.6.21/32172.16.6.21 – 172.16.6.21172.16.6.21
23172.16.6.22/32172.16.6.22 – 172.16.6.22172.16.6.22
24172.16.6.23/32172.16.6.23 – 172.16.6.23172.16.6.23
25172.16.6.24/32172.16.6.24 – 172.16.6.24172.16.6.24
26172.16.6.25/32172.16.6.25 – 172.16.6.25172.16.6.25
27172.16.6.26/32172.16.6.26 – 172.16.6.26172.16.6.26
28172.16.6.27/32172.16.6.27 – 172.16.6.27172.16.6.27
29172.16.6.28/32172.16.6.28 – 172.16.6.28172.16.6.28
30172.16.6.29/32172.16.6.29 – 172.16.6.29172.16.6.29
31172.16.6.30/32172.16.6.30 – 172.16.6.30172.16.6.30
32172.16.6.31/32172.16.6.31 – 172.16.6.31172.16.6.31
33172.16.6.32/32172.16.6.32 – 172.16.6.32172.16.6.32
34172.16.6.33/32172.16.6.33 – 172.16.6.33172.16.6.33
35172.16.6.34/32172.16.6.34 – 172.16.6.34172.16.6.34
36172.16.6.35/32172.16.6.35 – 172.16.6.35172.16.6.35
37172.16.6.36/32172.16.6.36 – 172.16.6.36172.16.6.36
38172.16.6.37/32172.16.6.37 – 172.16.6.37172.16.6.37
39172.16.6.38/32172.16.6.38 – 172.16.6.38172.16.6.38
40172.16.6.39/32172.16.6.39 – 172.16.6.39172.16.6.39
41172.16.6.40/32172.16.6.40 – 172.16.6.40172.16.6.40
42172.16.6.41/32172.16.6.41 – 172.16.6.41172.16.6.41
43172.16.6.42/32172.16.6.42 – 172.16.6.42172.16.6.42
44172.16.6.43/32172.16.6.43 – 172.16.6.43172.16.6.43
45172.16.6.44/32172.16.6.44 – 172.16.6.44172.16.6.44
46172.16.6.45/32172.16.6.45 – 172.16.6.45172.16.6.45
47172.16.6.46/32172.16.6.46 – 172.16.6.46172.16.6.46
48172.16.6.47/32172.16.6.47 – 172.16.6.47172.16.6.47
49172.16.6.48/32172.16.6.48 – 172.16.6.48172.16.6.48
50172.16.6.49/32172.16.6.49 – 172.16.6.49172.16.6.49
51172.16.6.50/32172.16.6.50 – 172.16.6.50172.16.6.50
52172.16.6.51/32172.16.6.51 – 172.16.6.51172.16.6.51
53172.16.6.52/32172.16.6.52 – 172.16.6.52172.16.6.52
54172.16.6.53/32172.16.6.53 – 172.16.6.53172.16.6.53
55172.16.6.54/32172.16.6.54 – 172.16.6.54172.16.6.54
56172.16.6.55/32172.16.6.55 – 172.16.6.55172.16.6.55
57172.16.6.56/32172.16.6.56 – 172.16.6.56172.16.6.56
58172.16.6.57/32172.16.6.57 – 172.16.6.57172.16.6.57
59172.16.6.58/32172.16.6.58 – 172.16.6.58172.16.6.58
60172.16.6.59/32172.16.6.59 – 172.16.6.59172.16.6.59
61172.16.6.60/32172.16.6.60 – 172.16.6.60172.16.6.60
62172.16.6.61/32172.16.6.61 – 172.16.6.61172.16.6.61
63172.16.6.62/32172.16.6.62 – 172.16.6.62172.16.6.62
64172.16.6.63/32172.16.6.63 – 172.16.6.63172.16.6.63
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /26
/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-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →