ip
ipku.in

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)10.2.16.0/25
network10.2.16.0/25
broadcast10.2.16.127
first host10.2.16.1
last host10.2.16.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.16.0/25
address00001010.00000010.00010000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00010000.00000000
broadcast00001010.00000010.00010000.01111111
green = network part, grey = host part
hex0x0a021000
decimal167907328
reverse dns0.16.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1000

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.16.0/3210.2.16.0 – 10.2.16.010.2.16.0
210.2.16.1/3210.2.16.1 – 10.2.16.110.2.16.1
310.2.16.2/3210.2.16.2 – 10.2.16.210.2.16.2
410.2.16.3/3210.2.16.3 – 10.2.16.310.2.16.3
510.2.16.4/3210.2.16.4 – 10.2.16.410.2.16.4
610.2.16.5/3210.2.16.5 – 10.2.16.510.2.16.5
710.2.16.6/3210.2.16.6 – 10.2.16.610.2.16.6
810.2.16.7/3210.2.16.7 – 10.2.16.710.2.16.7
910.2.16.8/3210.2.16.8 – 10.2.16.810.2.16.8
1010.2.16.9/3210.2.16.9 – 10.2.16.910.2.16.9
1110.2.16.10/3210.2.16.10 – 10.2.16.1010.2.16.10
1210.2.16.11/3210.2.16.11 – 10.2.16.1110.2.16.11
1310.2.16.12/3210.2.16.12 – 10.2.16.1210.2.16.12
1410.2.16.13/3210.2.16.13 – 10.2.16.1310.2.16.13
1510.2.16.14/3210.2.16.14 – 10.2.16.1410.2.16.14
1610.2.16.15/3210.2.16.15 – 10.2.16.1510.2.16.15
1710.2.16.16/3210.2.16.16 – 10.2.16.1610.2.16.16
1810.2.16.17/3210.2.16.17 – 10.2.16.1710.2.16.17
1910.2.16.18/3210.2.16.18 – 10.2.16.1810.2.16.18
2010.2.16.19/3210.2.16.19 – 10.2.16.1910.2.16.19
2110.2.16.20/3210.2.16.20 – 10.2.16.2010.2.16.20
2210.2.16.21/3210.2.16.21 – 10.2.16.2110.2.16.21
2310.2.16.22/3210.2.16.22 – 10.2.16.2210.2.16.22
2410.2.16.23/3210.2.16.23 – 10.2.16.2310.2.16.23
2510.2.16.24/3210.2.16.24 – 10.2.16.2410.2.16.24
2610.2.16.25/3210.2.16.25 – 10.2.16.2510.2.16.25
2710.2.16.26/3210.2.16.26 – 10.2.16.2610.2.16.26
2810.2.16.27/3210.2.16.27 – 10.2.16.2710.2.16.27
2910.2.16.28/3210.2.16.28 – 10.2.16.2810.2.16.28
3010.2.16.29/3210.2.16.29 – 10.2.16.2910.2.16.29
3110.2.16.30/3210.2.16.30 – 10.2.16.3010.2.16.30
3210.2.16.31/3210.2.16.31 – 10.2.16.3110.2.16.31
3310.2.16.32/3210.2.16.32 – 10.2.16.3210.2.16.32
3410.2.16.33/3210.2.16.33 – 10.2.16.3310.2.16.33
3510.2.16.34/3210.2.16.34 – 10.2.16.3410.2.16.34
3610.2.16.35/3210.2.16.35 – 10.2.16.3510.2.16.35
3710.2.16.36/3210.2.16.36 – 10.2.16.3610.2.16.36
3810.2.16.37/3210.2.16.37 – 10.2.16.3710.2.16.37
3910.2.16.38/3210.2.16.38 – 10.2.16.3810.2.16.38
4010.2.16.39/3210.2.16.39 – 10.2.16.3910.2.16.39
4110.2.16.40/3210.2.16.40 – 10.2.16.4010.2.16.40
4210.2.16.41/3210.2.16.41 – 10.2.16.4110.2.16.41
4310.2.16.42/3210.2.16.42 – 10.2.16.4210.2.16.42
4410.2.16.43/3210.2.16.43 – 10.2.16.4310.2.16.43
4510.2.16.44/3210.2.16.44 – 10.2.16.4410.2.16.44
4610.2.16.45/3210.2.16.45 – 10.2.16.4510.2.16.45
4710.2.16.46/3210.2.16.46 – 10.2.16.4610.2.16.46
4810.2.16.47/3210.2.16.47 – 10.2.16.4710.2.16.47
4910.2.16.48/3210.2.16.48 – 10.2.16.4810.2.16.48
5010.2.16.49/3210.2.16.49 – 10.2.16.4910.2.16.49
5110.2.16.50/3210.2.16.50 – 10.2.16.5010.2.16.50
5210.2.16.51/3210.2.16.51 – 10.2.16.5110.2.16.51
5310.2.16.52/3210.2.16.52 – 10.2.16.5210.2.16.52
5410.2.16.53/3210.2.16.53 – 10.2.16.5310.2.16.53
5510.2.16.54/3210.2.16.54 – 10.2.16.5410.2.16.54
5610.2.16.55/3210.2.16.55 – 10.2.16.5510.2.16.55
5710.2.16.56/3210.2.16.56 – 10.2.16.5610.2.16.56
5810.2.16.57/3210.2.16.57 – 10.2.16.5710.2.16.57
5910.2.16.58/3210.2.16.58 – 10.2.16.5810.2.16.58
6010.2.16.59/3210.2.16.59 – 10.2.16.5910.2.16.59
6110.2.16.60/3210.2.16.60 – 10.2.16.6010.2.16.60
6210.2.16.61/3210.2.16.61 – 10.2.16.6110.2.16.61
6310.2.16.62/3210.2.16.62 – 10.2.16.6210.2.16.62
6410.2.16.63/3210.2.16.63 – 10.2.16.6310.2.16.63
6510.2.16.64/3210.2.16.64 – 10.2.16.6410.2.16.64
6610.2.16.65/3210.2.16.65 – 10.2.16.6510.2.16.65
6710.2.16.66/3210.2.16.66 – 10.2.16.6610.2.16.66
6810.2.16.67/3210.2.16.67 – 10.2.16.6710.2.16.67
6910.2.16.68/3210.2.16.68 – 10.2.16.6810.2.16.68
7010.2.16.69/3210.2.16.69 – 10.2.16.6910.2.16.69
7110.2.16.70/3210.2.16.70 – 10.2.16.7010.2.16.70
7210.2.16.71/3210.2.16.71 – 10.2.16.7110.2.16.71
7310.2.16.72/3210.2.16.72 – 10.2.16.7210.2.16.72
7410.2.16.73/3210.2.16.73 – 10.2.16.7310.2.16.73
7510.2.16.74/3210.2.16.74 – 10.2.16.7410.2.16.74
7610.2.16.75/3210.2.16.75 – 10.2.16.7510.2.16.75
7710.2.16.76/3210.2.16.76 – 10.2.16.7610.2.16.76
7810.2.16.77/3210.2.16.77 – 10.2.16.7710.2.16.77
7910.2.16.78/3210.2.16.78 – 10.2.16.7810.2.16.78
8010.2.16.79/3210.2.16.79 – 10.2.16.7910.2.16.79
8110.2.16.80/3210.2.16.80 – 10.2.16.8010.2.16.80
8210.2.16.81/3210.2.16.81 – 10.2.16.8110.2.16.81
8310.2.16.82/3210.2.16.82 – 10.2.16.8210.2.16.82
8410.2.16.83/3210.2.16.83 – 10.2.16.8310.2.16.83
8510.2.16.84/3210.2.16.84 – 10.2.16.8410.2.16.84
8610.2.16.85/3210.2.16.85 – 10.2.16.8510.2.16.85
8710.2.16.86/3210.2.16.86 – 10.2.16.8610.2.16.86
8810.2.16.87/3210.2.16.87 – 10.2.16.8710.2.16.87
8910.2.16.88/3210.2.16.88 – 10.2.16.8810.2.16.88
9010.2.16.89/3210.2.16.89 – 10.2.16.8910.2.16.89
9110.2.16.90/3210.2.16.90 – 10.2.16.9010.2.16.90
9210.2.16.91/3210.2.16.91 – 10.2.16.9110.2.16.91
9310.2.16.92/3210.2.16.92 – 10.2.16.9210.2.16.92
9410.2.16.93/3210.2.16.93 – 10.2.16.9310.2.16.93
9510.2.16.94/3210.2.16.94 – 10.2.16.9410.2.16.94
9610.2.16.95/3210.2.16.95 – 10.2.16.9510.2.16.95
9710.2.16.96/3210.2.16.96 – 10.2.16.9610.2.16.96
9810.2.16.97/3210.2.16.97 – 10.2.16.9710.2.16.97
9910.2.16.98/3210.2.16.98 – 10.2.16.9810.2.16.98
10010.2.16.99/3210.2.16.99 – 10.2.16.9910.2.16.99
10110.2.16.100/3210.2.16.100 – 10.2.16.10010.2.16.100
10210.2.16.101/3210.2.16.101 – 10.2.16.10110.2.16.101
10310.2.16.102/3210.2.16.102 – 10.2.16.10210.2.16.102
10410.2.16.103/3210.2.16.103 – 10.2.16.10310.2.16.103
10510.2.16.104/3210.2.16.104 – 10.2.16.10410.2.16.104
10610.2.16.105/3210.2.16.105 – 10.2.16.10510.2.16.105
10710.2.16.106/3210.2.16.106 – 10.2.16.10610.2.16.106
10810.2.16.107/3210.2.16.107 – 10.2.16.10710.2.16.107
10910.2.16.108/3210.2.16.108 – 10.2.16.10810.2.16.108
11010.2.16.109/3210.2.16.109 – 10.2.16.10910.2.16.109
11110.2.16.110/3210.2.16.110 – 10.2.16.11010.2.16.110
11210.2.16.111/3210.2.16.111 – 10.2.16.11110.2.16.111
11310.2.16.112/3210.2.16.112 – 10.2.16.11210.2.16.112
11410.2.16.113/3210.2.16.113 – 10.2.16.11310.2.16.113
11510.2.16.114/3210.2.16.114 – 10.2.16.11410.2.16.114
11610.2.16.115/3210.2.16.115 – 10.2.16.11510.2.16.115
11710.2.16.116/3210.2.16.116 – 10.2.16.11610.2.16.116
11810.2.16.117/3210.2.16.117 – 10.2.16.11710.2.16.117
11910.2.16.118/3210.2.16.118 – 10.2.16.11810.2.16.118
12010.2.16.119/3210.2.16.119 – 10.2.16.11910.2.16.119
12110.2.16.120/3210.2.16.120 – 10.2.16.12010.2.16.120
12210.2.16.121/3210.2.16.121 – 10.2.16.12110.2.16.121
12310.2.16.122/3210.2.16.122 – 10.2.16.12210.2.16.122
12410.2.16.123/3210.2.16.123 – 10.2.16.12310.2.16.123
12510.2.16.124/3210.2.16.124 – 10.2.16.12410.2.16.124
12610.2.16.125/3210.2.16.125 – 10.2.16.12510.2.16.125
12710.2.16.126/3210.2.16.126 – 10.2.16.12610.2.16.126
12810.2.16.127/3210.2.16.127 – 10.2.16.12710.2.16.127
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 →