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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)172.16.14.0/25
network172.16.14.0/25
broadcast172.16.14.127
first host172.16.14.1
last host172.16.14.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classB
ipcalc 172.16.14.0/25
address10101100.00010000.00001110.00000000
subnet mask11111111.11111111.11111111.10000000
network10101100.00010000.00001110.00000000
broadcast10101100.00010000.00001110.01111111
green = network part, grey = host part
hex0xac100e00
decimal2886733312
reverse dns0.14.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:e00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.14.0/31172.16.14.0 – 172.16.14.1172.16.14.1
2172.16.14.2/31172.16.14.2 – 172.16.14.3172.16.14.3
3172.16.14.4/31172.16.14.4 – 172.16.14.5172.16.14.5
4172.16.14.6/31172.16.14.6 – 172.16.14.7172.16.14.7
5172.16.14.8/31172.16.14.8 – 172.16.14.9172.16.14.9
6172.16.14.10/31172.16.14.10 – 172.16.14.11172.16.14.11
7172.16.14.12/31172.16.14.12 – 172.16.14.13172.16.14.13
8172.16.14.14/31172.16.14.14 – 172.16.14.15172.16.14.15
9172.16.14.16/31172.16.14.16 – 172.16.14.17172.16.14.17
10172.16.14.18/31172.16.14.18 – 172.16.14.19172.16.14.19
11172.16.14.20/31172.16.14.20 – 172.16.14.21172.16.14.21
12172.16.14.22/31172.16.14.22 – 172.16.14.23172.16.14.23
13172.16.14.24/31172.16.14.24 – 172.16.14.25172.16.14.25
14172.16.14.26/31172.16.14.26 – 172.16.14.27172.16.14.27
15172.16.14.28/31172.16.14.28 – 172.16.14.29172.16.14.29
16172.16.14.30/31172.16.14.30 – 172.16.14.31172.16.14.31
17172.16.14.32/31172.16.14.32 – 172.16.14.33172.16.14.33
18172.16.14.34/31172.16.14.34 – 172.16.14.35172.16.14.35
19172.16.14.36/31172.16.14.36 – 172.16.14.37172.16.14.37
20172.16.14.38/31172.16.14.38 – 172.16.14.39172.16.14.39
21172.16.14.40/31172.16.14.40 – 172.16.14.41172.16.14.41
22172.16.14.42/31172.16.14.42 – 172.16.14.43172.16.14.43
23172.16.14.44/31172.16.14.44 – 172.16.14.45172.16.14.45
24172.16.14.46/31172.16.14.46 – 172.16.14.47172.16.14.47
25172.16.14.48/31172.16.14.48 – 172.16.14.49172.16.14.49
26172.16.14.50/31172.16.14.50 – 172.16.14.51172.16.14.51
27172.16.14.52/31172.16.14.52 – 172.16.14.53172.16.14.53
28172.16.14.54/31172.16.14.54 – 172.16.14.55172.16.14.55
29172.16.14.56/31172.16.14.56 – 172.16.14.57172.16.14.57
30172.16.14.58/31172.16.14.58 – 172.16.14.59172.16.14.59
31172.16.14.60/31172.16.14.60 – 172.16.14.61172.16.14.61
32172.16.14.62/31172.16.14.62 – 172.16.14.63172.16.14.63
33172.16.14.64/31172.16.14.64 – 172.16.14.65172.16.14.65
34172.16.14.66/31172.16.14.66 – 172.16.14.67172.16.14.67
35172.16.14.68/31172.16.14.68 – 172.16.14.69172.16.14.69
36172.16.14.70/31172.16.14.70 – 172.16.14.71172.16.14.71
37172.16.14.72/31172.16.14.72 – 172.16.14.73172.16.14.73
38172.16.14.74/31172.16.14.74 – 172.16.14.75172.16.14.75
39172.16.14.76/31172.16.14.76 – 172.16.14.77172.16.14.77
40172.16.14.78/31172.16.14.78 – 172.16.14.79172.16.14.79
41172.16.14.80/31172.16.14.80 – 172.16.14.81172.16.14.81
42172.16.14.82/31172.16.14.82 – 172.16.14.83172.16.14.83
43172.16.14.84/31172.16.14.84 – 172.16.14.85172.16.14.85
44172.16.14.86/31172.16.14.86 – 172.16.14.87172.16.14.87
45172.16.14.88/31172.16.14.88 – 172.16.14.89172.16.14.89
46172.16.14.90/31172.16.14.90 – 172.16.14.91172.16.14.91
47172.16.14.92/31172.16.14.92 – 172.16.14.93172.16.14.93
48172.16.14.94/31172.16.14.94 – 172.16.14.95172.16.14.95
49172.16.14.96/31172.16.14.96 – 172.16.14.97172.16.14.97
50172.16.14.98/31172.16.14.98 – 172.16.14.99172.16.14.99
51172.16.14.100/31172.16.14.100 – 172.16.14.101172.16.14.101
52172.16.14.102/31172.16.14.102 – 172.16.14.103172.16.14.103
53172.16.14.104/31172.16.14.104 – 172.16.14.105172.16.14.105
54172.16.14.106/31172.16.14.106 – 172.16.14.107172.16.14.107
55172.16.14.108/31172.16.14.108 – 172.16.14.109172.16.14.109
56172.16.14.110/31172.16.14.110 – 172.16.14.111172.16.14.111
57172.16.14.112/31172.16.14.112 – 172.16.14.113172.16.14.113
58172.16.14.114/31172.16.14.114 – 172.16.14.115172.16.14.115
59172.16.14.116/31172.16.14.116 – 172.16.14.117172.16.14.117
60172.16.14.118/31172.16.14.118 – 172.16.14.119172.16.14.119
61172.16.14.120/31172.16.14.120 – 172.16.14.121172.16.14.121
62172.16.14.122/31172.16.14.122 – 172.16.14.123172.16.14.123
63172.16.14.124/31172.16.14.124 – 172.16.14.125172.16.14.125
64172.16.14.126/31172.16.14.126 – 172.16.14.127172.16.14.127
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →