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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)172.16.11.0/25
network172.16.11.0/25
broadcast172.16.11.127
first host172.16.11.1
last host172.16.11.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classB
ipcalc 172.16.11.0/25
address10101100.00010000.00001011.00000000
subnet mask11111111.11111111.11111111.10000000
network10101100.00010000.00001011.00000000
broadcast10101100.00010000.00001011.01111111
green = network part, grey = host part
hex0xac100b00
decimal2886732544
reverse dns0.11.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:b00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.11.0/31172.16.11.0 – 172.16.11.1172.16.11.1
2172.16.11.2/31172.16.11.2 – 172.16.11.3172.16.11.3
3172.16.11.4/31172.16.11.4 – 172.16.11.5172.16.11.5
4172.16.11.6/31172.16.11.6 – 172.16.11.7172.16.11.7
5172.16.11.8/31172.16.11.8 – 172.16.11.9172.16.11.9
6172.16.11.10/31172.16.11.10 – 172.16.11.11172.16.11.11
7172.16.11.12/31172.16.11.12 – 172.16.11.13172.16.11.13
8172.16.11.14/31172.16.11.14 – 172.16.11.15172.16.11.15
9172.16.11.16/31172.16.11.16 – 172.16.11.17172.16.11.17
10172.16.11.18/31172.16.11.18 – 172.16.11.19172.16.11.19
11172.16.11.20/31172.16.11.20 – 172.16.11.21172.16.11.21
12172.16.11.22/31172.16.11.22 – 172.16.11.23172.16.11.23
13172.16.11.24/31172.16.11.24 – 172.16.11.25172.16.11.25
14172.16.11.26/31172.16.11.26 – 172.16.11.27172.16.11.27
15172.16.11.28/31172.16.11.28 – 172.16.11.29172.16.11.29
16172.16.11.30/31172.16.11.30 – 172.16.11.31172.16.11.31
17172.16.11.32/31172.16.11.32 – 172.16.11.33172.16.11.33
18172.16.11.34/31172.16.11.34 – 172.16.11.35172.16.11.35
19172.16.11.36/31172.16.11.36 – 172.16.11.37172.16.11.37
20172.16.11.38/31172.16.11.38 – 172.16.11.39172.16.11.39
21172.16.11.40/31172.16.11.40 – 172.16.11.41172.16.11.41
22172.16.11.42/31172.16.11.42 – 172.16.11.43172.16.11.43
23172.16.11.44/31172.16.11.44 – 172.16.11.45172.16.11.45
24172.16.11.46/31172.16.11.46 – 172.16.11.47172.16.11.47
25172.16.11.48/31172.16.11.48 – 172.16.11.49172.16.11.49
26172.16.11.50/31172.16.11.50 – 172.16.11.51172.16.11.51
27172.16.11.52/31172.16.11.52 – 172.16.11.53172.16.11.53
28172.16.11.54/31172.16.11.54 – 172.16.11.55172.16.11.55
29172.16.11.56/31172.16.11.56 – 172.16.11.57172.16.11.57
30172.16.11.58/31172.16.11.58 – 172.16.11.59172.16.11.59
31172.16.11.60/31172.16.11.60 – 172.16.11.61172.16.11.61
32172.16.11.62/31172.16.11.62 – 172.16.11.63172.16.11.63
33172.16.11.64/31172.16.11.64 – 172.16.11.65172.16.11.65
34172.16.11.66/31172.16.11.66 – 172.16.11.67172.16.11.67
35172.16.11.68/31172.16.11.68 – 172.16.11.69172.16.11.69
36172.16.11.70/31172.16.11.70 – 172.16.11.71172.16.11.71
37172.16.11.72/31172.16.11.72 – 172.16.11.73172.16.11.73
38172.16.11.74/31172.16.11.74 – 172.16.11.75172.16.11.75
39172.16.11.76/31172.16.11.76 – 172.16.11.77172.16.11.77
40172.16.11.78/31172.16.11.78 – 172.16.11.79172.16.11.79
41172.16.11.80/31172.16.11.80 – 172.16.11.81172.16.11.81
42172.16.11.82/31172.16.11.82 – 172.16.11.83172.16.11.83
43172.16.11.84/31172.16.11.84 – 172.16.11.85172.16.11.85
44172.16.11.86/31172.16.11.86 – 172.16.11.87172.16.11.87
45172.16.11.88/31172.16.11.88 – 172.16.11.89172.16.11.89
46172.16.11.90/31172.16.11.90 – 172.16.11.91172.16.11.91
47172.16.11.92/31172.16.11.92 – 172.16.11.93172.16.11.93
48172.16.11.94/31172.16.11.94 – 172.16.11.95172.16.11.95
49172.16.11.96/31172.16.11.96 – 172.16.11.97172.16.11.97
50172.16.11.98/31172.16.11.98 – 172.16.11.99172.16.11.99
51172.16.11.100/31172.16.11.100 – 172.16.11.101172.16.11.101
52172.16.11.102/31172.16.11.102 – 172.16.11.103172.16.11.103
53172.16.11.104/31172.16.11.104 – 172.16.11.105172.16.11.105
54172.16.11.106/31172.16.11.106 – 172.16.11.107172.16.11.107
55172.16.11.108/31172.16.11.108 – 172.16.11.109172.16.11.109
56172.16.11.110/31172.16.11.110 – 172.16.11.111172.16.11.111
57172.16.11.112/31172.16.11.112 – 172.16.11.113172.16.11.113
58172.16.11.114/31172.16.11.114 – 172.16.11.115172.16.11.115
59172.16.11.116/31172.16.11.116 – 172.16.11.117172.16.11.117
60172.16.11.118/31172.16.11.118 – 172.16.11.119172.16.11.119
61172.16.11.120/31172.16.11.120 – 172.16.11.121172.16.11.121
62172.16.11.122/31172.16.11.122 – 172.16.11.123172.16.11.123
63172.16.11.124/31172.16.11.124 – 172.16.11.125172.16.11.125
64172.16.11.126/31172.16.11.126 – 172.16.11.127172.16.11.127
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 →