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)10.2.15.0/25
network10.2.15.0/25
broadcast10.2.15.127
first host10.2.15.1
last host10.2.15.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.15.0/25
address00001010.00000010.00001111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00001111.00000000
broadcast00001010.00000010.00001111.01111111
green = network part, grey = host part
hex0x0a020f00
decimal167907072
reverse dns0.15.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:f00

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.15.0/3210.2.15.0 – 10.2.15.010.2.15.0
210.2.15.1/3210.2.15.1 – 10.2.15.110.2.15.1
310.2.15.2/3210.2.15.2 – 10.2.15.210.2.15.2
410.2.15.3/3210.2.15.3 – 10.2.15.310.2.15.3
510.2.15.4/3210.2.15.4 – 10.2.15.410.2.15.4
610.2.15.5/3210.2.15.5 – 10.2.15.510.2.15.5
710.2.15.6/3210.2.15.6 – 10.2.15.610.2.15.6
810.2.15.7/3210.2.15.7 – 10.2.15.710.2.15.7
910.2.15.8/3210.2.15.8 – 10.2.15.810.2.15.8
1010.2.15.9/3210.2.15.9 – 10.2.15.910.2.15.9
1110.2.15.10/3210.2.15.10 – 10.2.15.1010.2.15.10
1210.2.15.11/3210.2.15.11 – 10.2.15.1110.2.15.11
1310.2.15.12/3210.2.15.12 – 10.2.15.1210.2.15.12
1410.2.15.13/3210.2.15.13 – 10.2.15.1310.2.15.13
1510.2.15.14/3210.2.15.14 – 10.2.15.1410.2.15.14
1610.2.15.15/3210.2.15.15 – 10.2.15.1510.2.15.15
1710.2.15.16/3210.2.15.16 – 10.2.15.1610.2.15.16
1810.2.15.17/3210.2.15.17 – 10.2.15.1710.2.15.17
1910.2.15.18/3210.2.15.18 – 10.2.15.1810.2.15.18
2010.2.15.19/3210.2.15.19 – 10.2.15.1910.2.15.19
2110.2.15.20/3210.2.15.20 – 10.2.15.2010.2.15.20
2210.2.15.21/3210.2.15.21 – 10.2.15.2110.2.15.21
2310.2.15.22/3210.2.15.22 – 10.2.15.2210.2.15.22
2410.2.15.23/3210.2.15.23 – 10.2.15.2310.2.15.23
2510.2.15.24/3210.2.15.24 – 10.2.15.2410.2.15.24
2610.2.15.25/3210.2.15.25 – 10.2.15.2510.2.15.25
2710.2.15.26/3210.2.15.26 – 10.2.15.2610.2.15.26
2810.2.15.27/3210.2.15.27 – 10.2.15.2710.2.15.27
2910.2.15.28/3210.2.15.28 – 10.2.15.2810.2.15.28
3010.2.15.29/3210.2.15.29 – 10.2.15.2910.2.15.29
3110.2.15.30/3210.2.15.30 – 10.2.15.3010.2.15.30
3210.2.15.31/3210.2.15.31 – 10.2.15.3110.2.15.31
3310.2.15.32/3210.2.15.32 – 10.2.15.3210.2.15.32
3410.2.15.33/3210.2.15.33 – 10.2.15.3310.2.15.33
3510.2.15.34/3210.2.15.34 – 10.2.15.3410.2.15.34
3610.2.15.35/3210.2.15.35 – 10.2.15.3510.2.15.35
3710.2.15.36/3210.2.15.36 – 10.2.15.3610.2.15.36
3810.2.15.37/3210.2.15.37 – 10.2.15.3710.2.15.37
3910.2.15.38/3210.2.15.38 – 10.2.15.3810.2.15.38
4010.2.15.39/3210.2.15.39 – 10.2.15.3910.2.15.39
4110.2.15.40/3210.2.15.40 – 10.2.15.4010.2.15.40
4210.2.15.41/3210.2.15.41 – 10.2.15.4110.2.15.41
4310.2.15.42/3210.2.15.42 – 10.2.15.4210.2.15.42
4410.2.15.43/3210.2.15.43 – 10.2.15.4310.2.15.43
4510.2.15.44/3210.2.15.44 – 10.2.15.4410.2.15.44
4610.2.15.45/3210.2.15.45 – 10.2.15.4510.2.15.45
4710.2.15.46/3210.2.15.46 – 10.2.15.4610.2.15.46
4810.2.15.47/3210.2.15.47 – 10.2.15.4710.2.15.47
4910.2.15.48/3210.2.15.48 – 10.2.15.4810.2.15.48
5010.2.15.49/3210.2.15.49 – 10.2.15.4910.2.15.49
5110.2.15.50/3210.2.15.50 – 10.2.15.5010.2.15.50
5210.2.15.51/3210.2.15.51 – 10.2.15.5110.2.15.51
5310.2.15.52/3210.2.15.52 – 10.2.15.5210.2.15.52
5410.2.15.53/3210.2.15.53 – 10.2.15.5310.2.15.53
5510.2.15.54/3210.2.15.54 – 10.2.15.5410.2.15.54
5610.2.15.55/3210.2.15.55 – 10.2.15.5510.2.15.55
5710.2.15.56/3210.2.15.56 – 10.2.15.5610.2.15.56
5810.2.15.57/3210.2.15.57 – 10.2.15.5710.2.15.57
5910.2.15.58/3210.2.15.58 – 10.2.15.5810.2.15.58
6010.2.15.59/3210.2.15.59 – 10.2.15.5910.2.15.59
6110.2.15.60/3210.2.15.60 – 10.2.15.6010.2.15.60
6210.2.15.61/3210.2.15.61 – 10.2.15.6110.2.15.61
6310.2.15.62/3210.2.15.62 – 10.2.15.6210.2.15.62
6410.2.15.63/3210.2.15.63 – 10.2.15.6310.2.15.63
6510.2.15.64/3210.2.15.64 – 10.2.15.6410.2.15.64
6610.2.15.65/3210.2.15.65 – 10.2.15.6510.2.15.65
6710.2.15.66/3210.2.15.66 – 10.2.15.6610.2.15.66
6810.2.15.67/3210.2.15.67 – 10.2.15.6710.2.15.67
6910.2.15.68/3210.2.15.68 – 10.2.15.6810.2.15.68
7010.2.15.69/3210.2.15.69 – 10.2.15.6910.2.15.69
7110.2.15.70/3210.2.15.70 – 10.2.15.7010.2.15.70
7210.2.15.71/3210.2.15.71 – 10.2.15.7110.2.15.71
7310.2.15.72/3210.2.15.72 – 10.2.15.7210.2.15.72
7410.2.15.73/3210.2.15.73 – 10.2.15.7310.2.15.73
7510.2.15.74/3210.2.15.74 – 10.2.15.7410.2.15.74
7610.2.15.75/3210.2.15.75 – 10.2.15.7510.2.15.75
7710.2.15.76/3210.2.15.76 – 10.2.15.7610.2.15.76
7810.2.15.77/3210.2.15.77 – 10.2.15.7710.2.15.77
7910.2.15.78/3210.2.15.78 – 10.2.15.7810.2.15.78
8010.2.15.79/3210.2.15.79 – 10.2.15.7910.2.15.79
8110.2.15.80/3210.2.15.80 – 10.2.15.8010.2.15.80
8210.2.15.81/3210.2.15.81 – 10.2.15.8110.2.15.81
8310.2.15.82/3210.2.15.82 – 10.2.15.8210.2.15.82
8410.2.15.83/3210.2.15.83 – 10.2.15.8310.2.15.83
8510.2.15.84/3210.2.15.84 – 10.2.15.8410.2.15.84
8610.2.15.85/3210.2.15.85 – 10.2.15.8510.2.15.85
8710.2.15.86/3210.2.15.86 – 10.2.15.8610.2.15.86
8810.2.15.87/3210.2.15.87 – 10.2.15.8710.2.15.87
8910.2.15.88/3210.2.15.88 – 10.2.15.8810.2.15.88
9010.2.15.89/3210.2.15.89 – 10.2.15.8910.2.15.89
9110.2.15.90/3210.2.15.90 – 10.2.15.9010.2.15.90
9210.2.15.91/3210.2.15.91 – 10.2.15.9110.2.15.91
9310.2.15.92/3210.2.15.92 – 10.2.15.9210.2.15.92
9410.2.15.93/3210.2.15.93 – 10.2.15.9310.2.15.93
9510.2.15.94/3210.2.15.94 – 10.2.15.9410.2.15.94
9610.2.15.95/3210.2.15.95 – 10.2.15.9510.2.15.95
9710.2.15.96/3210.2.15.96 – 10.2.15.9610.2.15.96
9810.2.15.97/3210.2.15.97 – 10.2.15.9710.2.15.97
9910.2.15.98/3210.2.15.98 – 10.2.15.9810.2.15.98
10010.2.15.99/3210.2.15.99 – 10.2.15.9910.2.15.99
10110.2.15.100/3210.2.15.100 – 10.2.15.10010.2.15.100
10210.2.15.101/3210.2.15.101 – 10.2.15.10110.2.15.101
10310.2.15.102/3210.2.15.102 – 10.2.15.10210.2.15.102
10410.2.15.103/3210.2.15.103 – 10.2.15.10310.2.15.103
10510.2.15.104/3210.2.15.104 – 10.2.15.10410.2.15.104
10610.2.15.105/3210.2.15.105 – 10.2.15.10510.2.15.105
10710.2.15.106/3210.2.15.106 – 10.2.15.10610.2.15.106
10810.2.15.107/3210.2.15.107 – 10.2.15.10710.2.15.107
10910.2.15.108/3210.2.15.108 – 10.2.15.10810.2.15.108
11010.2.15.109/3210.2.15.109 – 10.2.15.10910.2.15.109
11110.2.15.110/3210.2.15.110 – 10.2.15.11010.2.15.110
11210.2.15.111/3210.2.15.111 – 10.2.15.11110.2.15.111
11310.2.15.112/3210.2.15.112 – 10.2.15.11210.2.15.112
11410.2.15.113/3210.2.15.113 – 10.2.15.11310.2.15.113
11510.2.15.114/3210.2.15.114 – 10.2.15.11410.2.15.114
11610.2.15.115/3210.2.15.115 – 10.2.15.11510.2.15.115
11710.2.15.116/3210.2.15.116 – 10.2.15.11610.2.15.116
11810.2.15.117/3210.2.15.117 – 10.2.15.11710.2.15.117
11910.2.15.118/3210.2.15.118 – 10.2.15.11810.2.15.118
12010.2.15.119/3210.2.15.119 – 10.2.15.11910.2.15.119
12110.2.15.120/3210.2.15.120 – 10.2.15.12010.2.15.120
12210.2.15.121/3210.2.15.121 – 10.2.15.12110.2.15.121
12310.2.15.122/3210.2.15.122 – 10.2.15.12210.2.15.122
12410.2.15.123/3210.2.15.123 – 10.2.15.12310.2.15.123
12510.2.15.124/3210.2.15.124 – 10.2.15.12410.2.15.124
12610.2.15.125/3210.2.15.125 – 10.2.15.12510.2.15.125
12710.2.15.126/3210.2.15.126 – 10.2.15.12610.2.15.126
12810.2.15.127/3210.2.15.127 – 10.2.15.12710.2.15.127
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 →