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)10.2.1.0/25
network10.2.1.0/25
broadcast10.2.1.127
first host10.2.1.1
last host10.2.1.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.1.0/25
address00001010.00000010.00000001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00000001.00000000
broadcast00001010.00000010.00000001.01111111
green = network part, grey = host part
hex0x0a020100
decimal167903488
reverse dns0.1.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:100

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.1.0/3210.2.1.0 – 10.2.1.010.2.1.0
210.2.1.1/3210.2.1.1 – 10.2.1.110.2.1.1
310.2.1.2/3210.2.1.2 – 10.2.1.210.2.1.2
410.2.1.3/3210.2.1.3 – 10.2.1.310.2.1.3
510.2.1.4/3210.2.1.4 – 10.2.1.410.2.1.4
610.2.1.5/3210.2.1.5 – 10.2.1.510.2.1.5
710.2.1.6/3210.2.1.6 – 10.2.1.610.2.1.6
810.2.1.7/3210.2.1.7 – 10.2.1.710.2.1.7
910.2.1.8/3210.2.1.8 – 10.2.1.810.2.1.8
1010.2.1.9/3210.2.1.9 – 10.2.1.910.2.1.9
1110.2.1.10/3210.2.1.10 – 10.2.1.1010.2.1.10
1210.2.1.11/3210.2.1.11 – 10.2.1.1110.2.1.11
1310.2.1.12/3210.2.1.12 – 10.2.1.1210.2.1.12
1410.2.1.13/3210.2.1.13 – 10.2.1.1310.2.1.13
1510.2.1.14/3210.2.1.14 – 10.2.1.1410.2.1.14
1610.2.1.15/3210.2.1.15 – 10.2.1.1510.2.1.15
1710.2.1.16/3210.2.1.16 – 10.2.1.1610.2.1.16
1810.2.1.17/3210.2.1.17 – 10.2.1.1710.2.1.17
1910.2.1.18/3210.2.1.18 – 10.2.1.1810.2.1.18
2010.2.1.19/3210.2.1.19 – 10.2.1.1910.2.1.19
2110.2.1.20/3210.2.1.20 – 10.2.1.2010.2.1.20
2210.2.1.21/3210.2.1.21 – 10.2.1.2110.2.1.21
2310.2.1.22/3210.2.1.22 – 10.2.1.2210.2.1.22
2410.2.1.23/3210.2.1.23 – 10.2.1.2310.2.1.23
2510.2.1.24/3210.2.1.24 – 10.2.1.2410.2.1.24
2610.2.1.25/3210.2.1.25 – 10.2.1.2510.2.1.25
2710.2.1.26/3210.2.1.26 – 10.2.1.2610.2.1.26
2810.2.1.27/3210.2.1.27 – 10.2.1.2710.2.1.27
2910.2.1.28/3210.2.1.28 – 10.2.1.2810.2.1.28
3010.2.1.29/3210.2.1.29 – 10.2.1.2910.2.1.29
3110.2.1.30/3210.2.1.30 – 10.2.1.3010.2.1.30
3210.2.1.31/3210.2.1.31 – 10.2.1.3110.2.1.31
3310.2.1.32/3210.2.1.32 – 10.2.1.3210.2.1.32
3410.2.1.33/3210.2.1.33 – 10.2.1.3310.2.1.33
3510.2.1.34/3210.2.1.34 – 10.2.1.3410.2.1.34
3610.2.1.35/3210.2.1.35 – 10.2.1.3510.2.1.35
3710.2.1.36/3210.2.1.36 – 10.2.1.3610.2.1.36
3810.2.1.37/3210.2.1.37 – 10.2.1.3710.2.1.37
3910.2.1.38/3210.2.1.38 – 10.2.1.3810.2.1.38
4010.2.1.39/3210.2.1.39 – 10.2.1.3910.2.1.39
4110.2.1.40/3210.2.1.40 – 10.2.1.4010.2.1.40
4210.2.1.41/3210.2.1.41 – 10.2.1.4110.2.1.41
4310.2.1.42/3210.2.1.42 – 10.2.1.4210.2.1.42
4410.2.1.43/3210.2.1.43 – 10.2.1.4310.2.1.43
4510.2.1.44/3210.2.1.44 – 10.2.1.4410.2.1.44
4610.2.1.45/3210.2.1.45 – 10.2.1.4510.2.1.45
4710.2.1.46/3210.2.1.46 – 10.2.1.4610.2.1.46
4810.2.1.47/3210.2.1.47 – 10.2.1.4710.2.1.47
4910.2.1.48/3210.2.1.48 – 10.2.1.4810.2.1.48
5010.2.1.49/3210.2.1.49 – 10.2.1.4910.2.1.49
5110.2.1.50/3210.2.1.50 – 10.2.1.5010.2.1.50
5210.2.1.51/3210.2.1.51 – 10.2.1.5110.2.1.51
5310.2.1.52/3210.2.1.52 – 10.2.1.5210.2.1.52
5410.2.1.53/3210.2.1.53 – 10.2.1.5310.2.1.53
5510.2.1.54/3210.2.1.54 – 10.2.1.5410.2.1.54
5610.2.1.55/3210.2.1.55 – 10.2.1.5510.2.1.55
5710.2.1.56/3210.2.1.56 – 10.2.1.5610.2.1.56
5810.2.1.57/3210.2.1.57 – 10.2.1.5710.2.1.57
5910.2.1.58/3210.2.1.58 – 10.2.1.5810.2.1.58
6010.2.1.59/3210.2.1.59 – 10.2.1.5910.2.1.59
6110.2.1.60/3210.2.1.60 – 10.2.1.6010.2.1.60
6210.2.1.61/3210.2.1.61 – 10.2.1.6110.2.1.61
6310.2.1.62/3210.2.1.62 – 10.2.1.6210.2.1.62
6410.2.1.63/3210.2.1.63 – 10.2.1.6310.2.1.63
6510.2.1.64/3210.2.1.64 – 10.2.1.6410.2.1.64
6610.2.1.65/3210.2.1.65 – 10.2.1.6510.2.1.65
6710.2.1.66/3210.2.1.66 – 10.2.1.6610.2.1.66
6810.2.1.67/3210.2.1.67 – 10.2.1.6710.2.1.67
6910.2.1.68/3210.2.1.68 – 10.2.1.6810.2.1.68
7010.2.1.69/3210.2.1.69 – 10.2.1.6910.2.1.69
7110.2.1.70/3210.2.1.70 – 10.2.1.7010.2.1.70
7210.2.1.71/3210.2.1.71 – 10.2.1.7110.2.1.71
7310.2.1.72/3210.2.1.72 – 10.2.1.7210.2.1.72
7410.2.1.73/3210.2.1.73 – 10.2.1.7310.2.1.73
7510.2.1.74/3210.2.1.74 – 10.2.1.7410.2.1.74
7610.2.1.75/3210.2.1.75 – 10.2.1.7510.2.1.75
7710.2.1.76/3210.2.1.76 – 10.2.1.7610.2.1.76
7810.2.1.77/3210.2.1.77 – 10.2.1.7710.2.1.77
7910.2.1.78/3210.2.1.78 – 10.2.1.7810.2.1.78
8010.2.1.79/3210.2.1.79 – 10.2.1.7910.2.1.79
8110.2.1.80/3210.2.1.80 – 10.2.1.8010.2.1.80
8210.2.1.81/3210.2.1.81 – 10.2.1.8110.2.1.81
8310.2.1.82/3210.2.1.82 – 10.2.1.8210.2.1.82
8410.2.1.83/3210.2.1.83 – 10.2.1.8310.2.1.83
8510.2.1.84/3210.2.1.84 – 10.2.1.8410.2.1.84
8610.2.1.85/3210.2.1.85 – 10.2.1.8510.2.1.85
8710.2.1.86/3210.2.1.86 – 10.2.1.8610.2.1.86
8810.2.1.87/3210.2.1.87 – 10.2.1.8710.2.1.87
8910.2.1.88/3210.2.1.88 – 10.2.1.8810.2.1.88
9010.2.1.89/3210.2.1.89 – 10.2.1.8910.2.1.89
9110.2.1.90/3210.2.1.90 – 10.2.1.9010.2.1.90
9210.2.1.91/3210.2.1.91 – 10.2.1.9110.2.1.91
9310.2.1.92/3210.2.1.92 – 10.2.1.9210.2.1.92
9410.2.1.93/3210.2.1.93 – 10.2.1.9310.2.1.93
9510.2.1.94/3210.2.1.94 – 10.2.1.9410.2.1.94
9610.2.1.95/3210.2.1.95 – 10.2.1.9510.2.1.95
9710.2.1.96/3210.2.1.96 – 10.2.1.9610.2.1.96
9810.2.1.97/3210.2.1.97 – 10.2.1.9710.2.1.97
9910.2.1.98/3210.2.1.98 – 10.2.1.9810.2.1.98
10010.2.1.99/3210.2.1.99 – 10.2.1.9910.2.1.99
10110.2.1.100/3210.2.1.100 – 10.2.1.10010.2.1.100
10210.2.1.101/3210.2.1.101 – 10.2.1.10110.2.1.101
10310.2.1.102/3210.2.1.102 – 10.2.1.10210.2.1.102
10410.2.1.103/3210.2.1.103 – 10.2.1.10310.2.1.103
10510.2.1.104/3210.2.1.104 – 10.2.1.10410.2.1.104
10610.2.1.105/3210.2.1.105 – 10.2.1.10510.2.1.105
10710.2.1.106/3210.2.1.106 – 10.2.1.10610.2.1.106
10810.2.1.107/3210.2.1.107 – 10.2.1.10710.2.1.107
10910.2.1.108/3210.2.1.108 – 10.2.1.10810.2.1.108
11010.2.1.109/3210.2.1.109 – 10.2.1.10910.2.1.109
11110.2.1.110/3210.2.1.110 – 10.2.1.11010.2.1.110
11210.2.1.111/3210.2.1.111 – 10.2.1.11110.2.1.111
11310.2.1.112/3210.2.1.112 – 10.2.1.11210.2.1.112
11410.2.1.113/3210.2.1.113 – 10.2.1.11310.2.1.113
11510.2.1.114/3210.2.1.114 – 10.2.1.11410.2.1.114
11610.2.1.115/3210.2.1.115 – 10.2.1.11510.2.1.115
11710.2.1.116/3210.2.1.116 – 10.2.1.11610.2.1.116
11810.2.1.117/3210.2.1.117 – 10.2.1.11710.2.1.117
11910.2.1.118/3210.2.1.118 – 10.2.1.11810.2.1.118
12010.2.1.119/3210.2.1.119 – 10.2.1.11910.2.1.119
12110.2.1.120/3210.2.1.120 – 10.2.1.12010.2.1.120
12210.2.1.121/3210.2.1.121 – 10.2.1.12110.2.1.121
12310.2.1.122/3210.2.1.122 – 10.2.1.12210.2.1.122
12410.2.1.123/3210.2.1.123 – 10.2.1.12310.2.1.123
12510.2.1.124/3210.2.1.124 – 10.2.1.12410.2.1.124
12610.2.1.125/3210.2.1.125 – 10.2.1.12510.2.1.125
12710.2.1.126/3210.2.1.126 – 10.2.1.12610.2.1.126
12810.2.1.127/3210.2.1.127 – 10.2.1.12710.2.1.127
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 →