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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)172.16.3.0/26
network172.16.3.0/26
broadcast172.16.3.63
first host172.16.3.1
last host172.16.3.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.3.0/26
address10101100.00010000.00000011.00000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000011.00000000
broadcast10101100.00010000.00000011.00111111
green = network part, grey = host part
hex0xac100300
decimal2886730496
reverse dns0.3.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:300

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.3.0/32172.16.3.0 – 172.16.3.0172.16.3.0
2172.16.3.1/32172.16.3.1 – 172.16.3.1172.16.3.1
3172.16.3.2/32172.16.3.2 – 172.16.3.2172.16.3.2
4172.16.3.3/32172.16.3.3 – 172.16.3.3172.16.3.3
5172.16.3.4/32172.16.3.4 – 172.16.3.4172.16.3.4
6172.16.3.5/32172.16.3.5 – 172.16.3.5172.16.3.5
7172.16.3.6/32172.16.3.6 – 172.16.3.6172.16.3.6
8172.16.3.7/32172.16.3.7 – 172.16.3.7172.16.3.7
9172.16.3.8/32172.16.3.8 – 172.16.3.8172.16.3.8
10172.16.3.9/32172.16.3.9 – 172.16.3.9172.16.3.9
11172.16.3.10/32172.16.3.10 – 172.16.3.10172.16.3.10
12172.16.3.11/32172.16.3.11 – 172.16.3.11172.16.3.11
13172.16.3.12/32172.16.3.12 – 172.16.3.12172.16.3.12
14172.16.3.13/32172.16.3.13 – 172.16.3.13172.16.3.13
15172.16.3.14/32172.16.3.14 – 172.16.3.14172.16.3.14
16172.16.3.15/32172.16.3.15 – 172.16.3.15172.16.3.15
17172.16.3.16/32172.16.3.16 – 172.16.3.16172.16.3.16
18172.16.3.17/32172.16.3.17 – 172.16.3.17172.16.3.17
19172.16.3.18/32172.16.3.18 – 172.16.3.18172.16.3.18
20172.16.3.19/32172.16.3.19 – 172.16.3.19172.16.3.19
21172.16.3.20/32172.16.3.20 – 172.16.3.20172.16.3.20
22172.16.3.21/32172.16.3.21 – 172.16.3.21172.16.3.21
23172.16.3.22/32172.16.3.22 – 172.16.3.22172.16.3.22
24172.16.3.23/32172.16.3.23 – 172.16.3.23172.16.3.23
25172.16.3.24/32172.16.3.24 – 172.16.3.24172.16.3.24
26172.16.3.25/32172.16.3.25 – 172.16.3.25172.16.3.25
27172.16.3.26/32172.16.3.26 – 172.16.3.26172.16.3.26
28172.16.3.27/32172.16.3.27 – 172.16.3.27172.16.3.27
29172.16.3.28/32172.16.3.28 – 172.16.3.28172.16.3.28
30172.16.3.29/32172.16.3.29 – 172.16.3.29172.16.3.29
31172.16.3.30/32172.16.3.30 – 172.16.3.30172.16.3.30
32172.16.3.31/32172.16.3.31 – 172.16.3.31172.16.3.31
33172.16.3.32/32172.16.3.32 – 172.16.3.32172.16.3.32
34172.16.3.33/32172.16.3.33 – 172.16.3.33172.16.3.33
35172.16.3.34/32172.16.3.34 – 172.16.3.34172.16.3.34
36172.16.3.35/32172.16.3.35 – 172.16.3.35172.16.3.35
37172.16.3.36/32172.16.3.36 – 172.16.3.36172.16.3.36
38172.16.3.37/32172.16.3.37 – 172.16.3.37172.16.3.37
39172.16.3.38/32172.16.3.38 – 172.16.3.38172.16.3.38
40172.16.3.39/32172.16.3.39 – 172.16.3.39172.16.3.39
41172.16.3.40/32172.16.3.40 – 172.16.3.40172.16.3.40
42172.16.3.41/32172.16.3.41 – 172.16.3.41172.16.3.41
43172.16.3.42/32172.16.3.42 – 172.16.3.42172.16.3.42
44172.16.3.43/32172.16.3.43 – 172.16.3.43172.16.3.43
45172.16.3.44/32172.16.3.44 – 172.16.3.44172.16.3.44
46172.16.3.45/32172.16.3.45 – 172.16.3.45172.16.3.45
47172.16.3.46/32172.16.3.46 – 172.16.3.46172.16.3.46
48172.16.3.47/32172.16.3.47 – 172.16.3.47172.16.3.47
49172.16.3.48/32172.16.3.48 – 172.16.3.48172.16.3.48
50172.16.3.49/32172.16.3.49 – 172.16.3.49172.16.3.49
51172.16.3.50/32172.16.3.50 – 172.16.3.50172.16.3.50
52172.16.3.51/32172.16.3.51 – 172.16.3.51172.16.3.51
53172.16.3.52/32172.16.3.52 – 172.16.3.52172.16.3.52
54172.16.3.53/32172.16.3.53 – 172.16.3.53172.16.3.53
55172.16.3.54/32172.16.3.54 – 172.16.3.54172.16.3.54
56172.16.3.55/32172.16.3.55 – 172.16.3.55172.16.3.55
57172.16.3.56/32172.16.3.56 – 172.16.3.56172.16.3.56
58172.16.3.57/32172.16.3.57 – 172.16.3.57172.16.3.57
59172.16.3.58/32172.16.3.58 – 172.16.3.58172.16.3.58
60172.16.3.59/32172.16.3.59 – 172.16.3.59172.16.3.59
61172.16.3.60/32172.16.3.60 – 172.16.3.60172.16.3.60
62172.16.3.61/32172.16.3.61 – 172.16.3.61172.16.3.61
63172.16.3.62/32172.16.3.62 – 172.16.3.62172.16.3.62
64172.16.3.63/32172.16.3.63 – 172.16.3.63172.16.3.63
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 →